In this video I finally take my courage in both hands and perform open heart surgery on my Yamaha engine. I take out the crankshaft and reveal the damage
You did a Great job splitting the engine !! It can be a bit daunting when your doing it alone and not done this type of thing before, like you said take plenty of pictures, You will be fine, Your doing really well !!
9:39 The lateral movement of the bearings is pretty normal for a crank that has done a few thousand miles, a brand new bearing won't have any movement that you can feel by hand. The main bearings on the 'blown up' side of the engine won't really have any more movement than the 'good side', the problem is that they are full of crap and it is very hard to get it out, some of it will have been hammered into the inner or outer races of the bearings, it basically welds its self to the races so you can never get it out. When you refit the crank make absolutely sure that the roll pins or little 'pips' on each bearing go into the recesses in the cases before you fit the top case!
Thanks sidecarbod. I did see those little pins and figured they were for locating the bearings. The good side bearings were a lot smoother rolling than the blown side, but I thought I'd better replace them all
Thanks for your comment. To be honest I went by the sound they made rather than checking the in the book. So as you say, while I was there...@@davidbrayshaw3529
I had an "event" on my RD nn years ago. It was getting to the blue light on the clock without any trouble. With a couple extra teeth on the front sprocket. The problem was a lean mixture, hole in piston, full on seize. I rebored and fitted new pistons and flushed the crankcase out with a hose then petrol, then WD40. I can't say how long it lasted, but it was many months more of thrashing to work 30 miles away and back.
Great job splitting the cases. I see your shop mate, Mr. Haynes Manual is keeping you company.😅 Regarding the crank primary gear, the safe way to break it loose is to wedge a cloth rag in the gears before you remove the clutch basket. The rag will not damage the gears or put stress on the crank. The primary gear nut is torqued to 47 foot pounds, so it is a bugger to break free. The gold glitter you found comes from the thrust washers between the crank webs and the connecting rods. This is a tell tale sign your crank needs a rebuild. As long as you are in there, plan on replacing all of the crank bearings and seals. Pay particular attention to the clutch side crank seal. The castellations on the seal should face in, towards the connecting rod. Silly detail the catches everyone out, the first time they do a tear down and rebuild. A good RU-vid resource for engine reassembly is South Texas Banshee. He has some good how to videos on how a home mechanic can do a good build with ordinary garage tools. If you ignore the water pump, a Banshee engine will look very familiar to you. Most definitely in the same design family. Lot of good tips in his videos. I learned a lot from them. He also discusses leak down testing and how to do it. Key take away is low air pressure! 6-8 psi or 1/2 a bar. Hang in there, you are doing great!
Hi Scott, thanks so much for all that great advice. It's up to the engineering shop to get that primary drive off. I knew of some 'unorthodox' methods of getting it off but the thought of having to replace any collateral damage led me down the leave it alone route
@@RepairandRideout Smart man! Just be sure to get your primary gear back with the crank. The primary gear and the clutch hub gear are a matched set. Yamaha matched them at the factory to optimize minimal gear lash. Trying to find a 40 plus year old, matched, primary gear and clutch would be a daunting task. Do not lose that gear! Ok, Sermon over. I started watching some of your ride videos. Great stuff from a part of France I am not familiar with. Very nice. Makes me miss strong French coffee and genuine croissants. Thank goodness we have a bakery owned by an ex-pat Frenchman in the area. His croissants are very good. I try to visit a few times a year. All that butter is bad for your health, but a an occasional treat makes life worthwhile. 😉 Ride safe.
I didn't know they were a matched pair, thank goodness I didn't get hammer happy with it. The insta 360 with bike kit has arrived from santa, so I'll do my best to make some better quality ride out videos in the spring. Fantastic rides around here, well worth a visit@@Scott-ph2yk
@@RepairandRideout The gentle approach is always better, when it comes to mechanical stuff. Looking forward to future ride videos. Thank you, Santa.🎅 Adding another part of France to my travel bucket list. 😊
Same thing happened to my Suzuki AP50 piston blow out I just changed the piston turned out to be wrong spark plug gap , your main bearings are knackered , but you can take the bearing sizes and buy them anywhere I use KOYO , I currently have my KMX125 engine in bits on the coffee table main bearings are knackered and has worn the bearing housing on the mag side so I'm going to glue the bearing in place , it's been on the table for 6 months just lost interest but luckily my friend has a off roader so I borrowed his engine for last summer ⛱️ lol 😎 ps: don't forget to oil the bearings.
@@RepairandRideout NEVER wedge the gears, even with soft metals. Use a proper clutch tool or lock the crank with a soft wedge at the rod's big end. Even soft metal wedges in gear teeth can and will cause gear teeth to crack and then break when run after reassembly.
no coin is made from copper in the uk, so that's your advice trashed, as would the primary gears if a tuppence piece was used, these things are elecro plated mild steel pressings
@@crozwayne Well smart arse, up until 1992 they were a copper/bronze alloy, hence the 'copper' in my reply. Can you also explain how a 'copper coated mild steel coin' post 1992 could actually harm a pair of hardened steel gears? Perhaps i have been doing this longer than you sonny?
@@crozwayne Never wedge gears and apply any torque while wedged. Gear failure from wedging can occur immediately or at a later time, but wedging gears will cause a tooth failure eventually.
Hi Chris , glad your getting stuck into it . A tip for undoing the primary drive nut is to wedge a piece of flattened copper pipe between the clutch drum gear and primary gear . Don't use a copper coin , these are mostly steel copper plated in the UK. Those main bearings r/h side are buggered . Get the crank rebuilt and all the crap cleaned out of the crank case . Use proper crank seals and the right sealer between the crank cases .
@@RepairandRideout Yamabond 4 is the best sealer I have used, for all brands of moto engines. The surfaces that it will be used on should be clean and dry as well. I use lacquer thinner to clean and isopropyl to dry, both on a white paper towel, and then once the iso is dry I apply the sealer and assemble the cases.
Hi Billy, thank you, great advice. I did get a tube of sealant (Three Bond TB1215 Grey OEM) along with all the bearings. Hope this is OK? Otherwise I can call in at my local Yamaha dealership @@BillyWillicker
@@RepairandRideout I have not used that type of sealer so can not make a yes or no recommendation on it. I have had excellent results with the Yamabond 4 consistently though. One to avoid is Permatex Motoseal.
The rods and rod bearings look fine. The mains on the failed cylinder's side are clearly damaged and noisy. Having them replaced competently can be tough unless you find a GOOD crank person for the job. The main bearings should be 6305's, get quality C3 open types for it.
Do you have a leakdown tester kit? Its a very good idea.. I rebuilt my rd400 and was meticulous about it and it still had leaks. All brand new gaskets everywhere but it leaked. Around where the reed cages are sandwiched and boots attach.. I had to use sealant to get them to stop. I also could not get the new copper head gasket to seal 100%. Had to use high temp sealant on that as well. I never would have known about these issues if I didnt buy that kit and could have fried my new engine. If I didnt kill it, it never would have run properly and Id be chasing jetting non-stop.
Hi Nigel, here's the link for the bike lift www.torros.fr/fr-fr/pont-moto-hydropneumatique-450-kg-tpsl450?gad_source=1&gclid=Cj0KCQjw6PGxBhCVARIsAIumnWZXYKNz3-_YuZ63q_PG7PNOUgf0yUbKh6pxhTPKrQDk-BQ45szhE4oaAvpvEALw_wcB
Not your biggest problem but those anti-vibration rubbers on the fins are bugging me - can you drop them down by a fin when you put the engine back in the bike. Don't think I've got OCD but who knows!!!🤣🤣🤣
