REBUILDING A YAMAHA YZF1000R THUNDERACE | PART 13 

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A little tip for you for testing the valves seating ability, sit the head up so the valves are pointing towards you and fill the ports with petrol, it is a lot easier to see fuel weeping past the valves rather that trying to see if a little puddle has gone down.

Once you finish I hope you ride it for several years, you'll have a special bond with it, one worth savouring.

you've got to do the compression test at full throttle.

Just remember, ‘The man who never made any mistakes, never did anything’. You’ll fix it and learn along the way 👍

Dude compression tests are done with the throttle wide open. Crank several times until it doesn't raise any more. That said, looking at your coolant, i think that you are barking up the wrong tree. Hope that i am wrong.

Regarding the fault report from the tachometer display: 3000 rpm is for the TPS (throttle position sensor), 7000 rpm is the EXUP and 8000 rpm is the fuel level indicator. As it works by displaying 0 rpm for 3 secs followed by the fault rpm for 2.5 secs and then the actual rpm for 3 secs I'm assuming the engine should be running to get these read outs. As yours isn't running it's likely a spurious reading and can be ignored until you get the engine running. This info is from an original Yamaha Thunderace owners manual I was lucky enough to find. Your persistence is amazing. Doing great!!

love the text message comedy 🤣 .... always best when things are taken with a good sense of humour 😉

You’re smashing it mate. Thank you for being honest and showing the whole process not a sugar coated edited version. Also love the sly nods to the hater 😂 it seems like he must have never made a mistake in his whole career or something 😂 channel is growing like mad. People appreciate seeing somebody battling through the struggle 👍🏻

I have to take my hat off too you. You're positivity, enthuasism and determination to see this through is inspiring. Well done.

Sick at it, your doing a great job, it's nice to see when people mess things up and have the guts to share it on video. Keep at it 👍

As far as I know if you put new piston rings in you should rehome the barrel so that they re-fit to the barrels😊

I do genuinely enjoy the content you put out and the skills you gain as you tackle every curve ball the the bike throws at you

The amount of patience you've got is amazing. Keep going. It'll all fall into place soon. By the way, I'd of thought F**k it, I'll weigh it in. 😂

Never skip a leg day. Love it

Hey man, I appreciate your honesty, openness, and willingness to put yourself out there. We're all seeing you learn as you go, and most of us did the same (learn as you go). I had the benefit of having a dad who included me on a lot of his projects, then stepped into drag racing, etc. I'm not going to rehash the other comments here. One bit of advice I'll give you is to slow down, even more, and read, re-read, and read some more. I am sure you are, but trust me. It's far easier to think thru a problem, then do a sanity check with others before you go tearing things apart again. That said, you're here! I agree with your final statements. If you've come this far, may as well go full on rebuild and get it all done at once. Just remember, there is NOTHING wrong with taking it slow, asking for help, and moving forward at a pace that doesn't freak you out.

Look Rye, of course I want you to rebuild this engine and have it working just perfect, but honestly, that’s not usually how life goes all the time. Plus your trials and tribulations makes for great content! Speaking of content, you’re editing and as well as your presentation is entertaining and quite good. Thanks for your hard work. Loving this channel👏

Keep up the work mate, loving the series so far and looking forward to the next one!

Great fun, can't wait to see it up and running. 👍❤️🇬🇧

Keep at it pal. Its the only way to learn. I'm learning from "YOUR" mistakes.😂🤣😂🤣THANKYOU. 👍👍👍

Great job sir. You have done the right thing. Outstanding.

Just enjoyed a cuppa and a catch up with my brother watching your latest updates. Keep up the good work. Never a dull moment, you will get there eventually.😊

This is quite funny, you tackle this with all the inevitable hiccups with great humour. Carry on, you're learning good.

Fair play for diving into that engine and rebuilding it mate. I had a YZF 750 R and currently have an R1. Your tacho fault indication will almost certainly be because the fuel plug is not connected, or the exup valve or cables are stuck. They all do it when the tank is off and that plug is undone. Good luck👍

Love ur enthusiasm and determination, fair play to ye m8 👍

Loving the video series makes for great viewing whatever the outcome 🤘🏻🤘🏻🤘🏻

And dont use water to check the seal. Use petrol.

Your doing good mate please keep it up don't give up you got this

I'm enjoying every episode and give You big cred for taking on these challenges! Carry on mate! Chers from another proffessional mechanic... 🙂

Well done for not giving up but while I get what you're doing a knowledgeable mate,even if only there to advise when asked or stop you doing "unwise" stuff would be better for a first rebuild. I rebuilt my first bike motor at 17,I was an apprentice mechanic and had a fellow apprentice helping me. When you're new to something 2 heads are better than 1,not least with complex machinery, quite easy to end up with a trashed motor.

never give up dude

Don't give up keep going. So what if its not all working out perfect. Don't be put down and you are learning so much. We all start with no experience regardless of what so may tell you.

Once this build is done you should definitely keep this bike and ride the wheels off it for a few years at the very least . Thunder Aces are real rippers. Love your videos mate!

I couldn't have been paying attention earlier in the build...I assumed you had fitted new piston rings lol oh well doing it now...makes sense. Keep going😊

great job mate i have the same bike you'll love it when its all sorted

Real life struggles. You’ll be happy in the end. Can’t wait to see it completed.

rome wasnt built in a day, keep at it pal

If you have compressed air you can blow up the inlet and exhaust. Any bubbles from around the valves and they're not sealing. If you do the rings the bores will need a light hone. Fail to do so and it'll be a smoker in short order. Biggest issue with doing the rings is getting the cylinder block back on. An extra pair of hands makes it a bit easier.

Another fantastic video bud

Its like watching the Mr Bean of motorcycle mechanics, keep it up its so funny.

That bike has sat for some years without turning over, so yes the piston rings will be lacking lubrication and will not be fully sealing hence the lower than expected compression, but for a short time that engine ran. That meant it had a fuel source, a spark and enough compression all at the same time, now it doesn’t run you are saying there is oil mixing in water in the radiator but failed to show it, you drained the coolant and it is looking clean, there is also no signs of oil water mix in the neck of the rad when you removed it that is also clean, sorry but I think I’m beginning to smell fishy pork pies here.

you got this!

Can’t wait to see the next one I’m sure it’ll be 100% when finished but you got to make a few cockups that’s how you learn 👍❤️

Seems like a right headache this one 😅 FYI you need to complete a compression tester with the throttle bodies wide open or if there removed it will do the same job as with them on idle opening you won’t pull enough air into the cylinders to get the correct reading, I would also recommend a decent compression tester as the cheap eBay ones can fluctuate massively (laser do a half decent one 👍) Best option though is leak down tester for future reference, can be used to check valve seating, piston rings and head gaskets without even removing the engine 😬

At least pulling the engine out the second time should be easier as you've already done it once and none of the bolts will seize or snap! Loving this series mate, great stuff.

Well love the the glamorous assistant top effort on her part a good dal better looking joking aside love the video thank you. I would have used petrol to see if the valves are leaking and one other point if you are going to replace the rings don't forget to honing the bores not teaching to such eggs love the new workshop thanks again

You will get it sorted mate

shame it had to come apart again. but we learn from are mistakes. you are braver than me. 🙏

I believe in you,,come on,let's get this done.

See MarkPearce post I have a rev counter doing the same thing when running is associated with the exup valve on my 05 FZS1000s. It is a crude way of telling you something is either amiss or non-standard with the valve or its cables. As I bought the bike with a micron can fitted I am assuming the valve is throwing its dummy out because of that. When I get round to it I will refit the original which came with bike and see if it stops waving at me.

Always interesting to watch Keep up the good work and dont Get disheartened Also if you decide you want an impact gun dont buy the 155 foot pound one its useless

You're learning loads, many of us have had to remove an engine again to put something right, so no self righteousness coming from me !

Fight the good fight. 👍🏻

dont use water

Really wanna kno the whole story behind "I'm a professional m8" Do tell. Looking forward to the dirtbike videos 🛠

Hmm.. A couple of things to consider here. I think its more usual to find coolant in oil that vice versa. I'd drop teh oil too.. Someone elese mentioned irregular compression readings. Head gasket issue are more likely to show up with one or two low readings not so much even low measurements across all four. While you have the head off I'd take to be checked for surface 'flatness' in case your previous handling (undoing out of equence) has caused some warp. I think it's not that likely but easy to check now before you ruin another head gasket.

Check your compression tester. Not uncommon that the one way valve is at the gauge end of the pipe. Hence in effect the volume of the pipe is added to the combustion chamber volume. This can dramatically affect the reading on bikes with comparatively small cylinder capacities. Possibly enough to give the low compression reading you had.

You've maybe gave yourself a lot more work as others say compression check should be done at full throttle,but at least you will learn more about the mechanical things which is no bad thing,but NEVER give up hope keep plugging away and keep up the projects good videos and good attitude.

Fuggin ell........glass half full ...good practice for you on the poss 🥸

Good on yeh if you can do it yourself, I love my bikes I've got 3 yamaha 20 valve mototors on the go to sort out one of them being an ace 👍

If you want to stop the rev counter messing around while your tank is off, bridge the two terminals on the green plug for the fuel senser with a piece of wire, this will put the fuel light on, but it will give you chance to see what your revs are 👍

If you are going to pop the pistons out why not have a shop overbore the cyclinders? Even go a bit bananas and skim the head and tickle the ports with some files. You will be amazed at how bad the casting is in most "off the shelf" engines. A guy called David Vizard who was (and I hope to this day) is an absolute legend wrote a few books on tuning. I did tons of engine tuning on the drive with David Vizards books.

good video Wonka.

love your determination, if it goes tit's up , think of all the kit you have . i'm going to subscribe cus i think you are great

Dont give up

I has one mate. The rings in the Thundersley are not good, they are known for burning oil, mine did. The head gasket is defo your first issue, a hone and new set of rings will make it pucker.

Your rev counter issue will go when the tank wiring is all plugged in. It's a how all 90s yamahas were

They did make a big bore kit for the ace at some time. Tjat was an idea for you. Sorry to plant that in your head. 😂. Hope you get the engine sorted. It did run before the clutchrod went flying

That bike is shaping up to be a beauty, and you're learning all the time, thanks to your lady and keep going it'll be worth it.

bro you have to have the throttle wide open when you test compression, it will be MUCH higher when you do it correctly, ask me how I know ! love your channel mate

Hi mate get the bore checked for wear/tolerance if ok light hone new rings away you go

For a comp test,you have to hold the throttle wide open.Also,if you did a leak down test,you would know if you have any significant leak,and where from.110 from a cold engine,with dry cylinders and closed throttle is not that bad

Hi buddy those compression figures you gave roughly about 190 psi. is kind of unheard of in a cold bike. The main thing that a compression test is going to tell you is if every cylinder is making the same compression and there aren’t any large discrepancies. And if you replace the piston rings and then did a compression with freshly honed bores. Your figures are probably going to read less because the rings haven’t bedded in.

Just a suggestion here....maybe the first time...take it to someone that knows how to, watch, learn, take in the knowledge from someone whoose done it a million times and then maybe, on the next one - tackle it yourself as it could get very expensive...theres nothing more demoralizing that having to do something again..! the way i tackle rebuilds... 1. strip right down totally (take the engine as one part at this point) - work from the frame upwards, cleaning and recoating. At the same time, take the motor to someone who knows how to... now ive finished watching....and the motor is back out...pull the rest of it apart...right down to its component parts...get the wheels powder coated, get any other parts cerakoated, its expensive but itll make the bike impervious to the elements. Then build it back up....while your doing that, pull the engine apart completely...get the whole lot cerakoated and then get someone to rebuild it - then reassemble...content gold for months!

Pity, it's a great bike, I rode one for 2 seasons, until the 98 R1 came out. That engine has the heart of an elephant, and would lift the front wheel, in 3rd, at 70 mph.

Brilliant Rye keep up the great work 👍🏻👍🏻

Don't have that butt plug in when you're working on the bike, you might go cross-eyed 😲

Definitely you need to hold throttle wide open to do comp test.

You might have been better to do a leak down test first but only way to learn is by trying good luck with it

Throttle position sensor may need adjustment with the rev thing going on .

Learning curve, the frustration is real no script ❤ it 😂..... Give yourself a little break after this monster, do a easier learner bike for a local.

Compression tester won’t tell you if oil ways to head arnt sealed. Cam timing or valve clearance incorrect and losing compression through not fully seated valves?

🏍👍

Don't think I'd be replacing the rings sounded OK when it ran . Lot of work and potential for more heartache

Another good vid. If your gonna put rings in your need to hone bores. Best get some help with that.

Hi did you do the compression test with the throttle held wide open

Did u hold throttle wide open when doing compression check ?

As an ex-mechanic I cringed when you just scrubbed the rust off of the bores . Ideally,not least on a bike that has been standing for so long you'd have at least gone for honing and new rings. I'm not trying to be critical but as others have said read the relevant parts of the manual properly before you do anything ,it'll save you a lot of time and grief in the long run. That coolant looked fine,did you get the rad flushed properly ?

Carry on mate, your girlfriend will be a master mechanic by the time this bikes done 😉

Maybe pick up a flex hone if you change the rings. Only about £30

It be no harm doing the piston rings and engine rebore cos they do burn oil at high rev as I had one

if its the same as the thundercat its either fuel tank not connected or tps out of whack

Get rid of that cursed Yamaha and buy another Honda Black Bird. You should specialize on refurbishing those lovely Honda 1100's. The Blackbird project went quite nicely and I think that is your niche. You could do the next Blackbird completely different than the last one and come up with something really cool!

You should have put a drop of 2stroke in the cylinders first then do the compression test with throttle wide open.

As long as there is compression and its within 5-10 psi of each other then it should still start. I dont think your engine work is the problem here. Assuming you checked the spark? Is the spark timing correct? Has the cdi burnt out? Are the stator magnets still intact? Even with a blown head gasket it would still start

Hey man I like the vidjos.f**k the naysayers man.keep on goin. The day anyone stops learning is the day they've given up...fair f**ks to ya 🛠

Rye come on give the engine block and good clean.You might as well get the block rehorned while your sticking new rings in 😂

Did you open the throttle when testing

Compression test needs full throttle The failure could be between oil way and water way of the head gasket

Any gas on that plug?? If so. Spark??