Subscriber Couldn't Fix This Honda 300ex Quad...So I Bought It 

Who has owned a Honda 300ex? How do you like it?

Super easy to work on these. Wish Honda would make the 300/400ex again. Someone ran the hell out of this one which is typical.

Great machines. Mine is an 02 and my dad and I have ran the hell out of it. Still original top and bottom end. We haven’t even taken the engine apart, and it starts on the 1st or 2nd spin every time.

These are some of the most versatile quads around. They can be made to be some pretty decent XC racers. When you order the new piston grab an 11:1 JE or Wiseco and that bad boy will come alive. You can also do the reverse mod so you don't have to mess with the button on the bars.

Just love those "Mystery box" defective machines openings! You never know what is waiting for you inside.

I've got the 84 trx 200 ,thing is bullet proof, I use it all the time ,I live in a small town so I run it around town to buy groceries, beer ,parts ,visit friends ,fishing and camping.

Don't u love how "don't know what's wrong with it and holds it wide fkn open" ..lol

I remember i used to look at them by the honda dealer in town here back around 95. Wanted one bad they looked so bad ass

My buddy used to own 94 300ex it was so reliable and so much fun to ride

I like that you actually describe what you're doing and reasons.

Great work on the video's. Would be nice to find a bigger garage near a testing area, then it would save you from bringing them to your parents place.

Nice video, enjoy watching your fixes👍

that was quick work of getting Q’s 007 Smoke Screen fired up. I highly suggest installing Kentucky air conditioning in your garage/shop/lab…one or two decent exhaust fans high on the rear wall will help, especially with a garage door opened up 10-18”, and the pipe pointed toward the rear. I know it’s cold most months out there, but we’d rather see you chilly, than lifeless. is there a dedicated site that you sell your repaired toys on?

at least i can watch yout videos on fixing and riding thing because in my country it's so hard to find a good deal i'm looking for a dirtbike for almost 3 years stiil riding my 50cc moped

Good job bro. you are great at fixing these things.

it's not as bad as it was, looks like the seafoam is working, but it won't cure all the ring problems, your doing a grand job

i really like your videos ,very informative

I’m so happy ur doing a 300ex lets go

My buddy had one and we put it thru hell and it didn’t give up on us once. solid machine

Sounds like it's tired got that vibration sound 💯

The rings being stuck and worn for sure. The scored piston and cylinder are bad too. Surprised it ran as well as it did with only 95 psi compression, bad rings, piston, and cylinder. As far as the valves go. Previous owner either never actually set the valve clearance, or has no idea how to do it properly. I have a 2003 Honda 300EX and it handles great, very reliable, and fun to ride.

When I was in college I bought a very built 300EX for 800 bucks nice bike it was 30 over stage 3 cam and jets 13 to 1 compression on 100 octane race fuel fmf header and pipe lowered and extended 1 inch only problem no Kickstart only Electric and I'm not sure if it had an auto compression release or not it burnt starters up constantly i bump started it as much as I could to save starters lol but she was fast!!!

Your a talented young man!

If its flooded, hold throttle wide open to clear it out, will probably let it start easier. Sounds pretty good. Definitely needs broke in.chromolly ring take forever to seat.

N easy tech tip is, other than obviously using piston to push rings down for gap. But also put rings in and hold cylinder up to light and look for light between rings and cylinder which will tell ya cylinder is out of round.

Been looking to get one of them!!

Can't wait to see the 250x video 😀

You should do a full racing build series on it

My 02 300 ex doesn't have the headlight housing 🤷🏽‍♂️🤦🏽‍♂️ The spark plug in my 300 ex is fouled out and black also. Does that mean my heads are gone and need to be replaced? Also when my four wheeler turns over. It doesn't sound rough.

Nice prairie 650. Solid atv.

Love your content!

Brings back memories! 300ex

Great video

I love it when people use RTV like GLUE. My goodness.

no wait! I want to see that 250x I just picked up a 1987 250x hopefully it has no spark .lol

Hii there I got a dacar quade bike it's a 200cc I need some help here the water from my radiator is pushing n going straight to my overflow bottle wt can I try to fix the problem thanks 💯

So I have a question about dirtbikes. I have a kx100 that im putting a top end on and the connecting rod bearing on the crankshaft end has some up and down play, a decent amount. If I didnt replace the crankshaft how long would the bike run with that play?

had a 93 300ex great bike only complaint i had was no back up start electric only

I had a atc200x that smoked like that…..we never had to worry about mosquitoes!

What's it mean if there is carbon build up under the valves where the plug and gas meet the piston and exhaust? I had 10 pounds of compression. It started smoking real bad and died ran good before that happened.

Ive only ridden the 250xs before but I here they do run better then a 300ex stock for stock. 250x has higher compression higher rev limiter and is lighter. It would be sweet to see a race and really compare the too.

Ive worked on all kinds of makes and model,s of ATV,s and what disturbs me the most is how rinky dinky some valves adjust, the newer stuff use,s roller rockers on the valve stem

I've had 3 of them, fun little machines!

Try mixing seafoam& Marvel mystery oil together as your stuck oil. Ring cleaner solution problem solver.

My last ATV was an old 1997 Suzuki Quadrunner 160 that I sold to North Georgia Speedway

Hey bud just a couple tips for ya . We have owned a family run engine machine shop for 40 years now . Reusing rings is a bad idea . And that cylinder should be bored and a new piston and rings purchased. Honing that cylinder and using used parts is like reusing a rubber , not a great idea lol . For the couple hundred bucks to buy a piston and have it bored right is worth it . Then you know what you have. It’s not unheard of to reuse a piston and clean up a cylinder and install new rings . But what your working on is failure . It got hot enough to melt the piston and it stuck to the cylinder. Reusing rings is not feasible at all . Rings form them selfs to the cylinder. Reusing is like round hole square peg . If you going to start doing engine work buy yourself a sunnen an hone for bigger stuff and a jr for little guys . You can buy both used for about a grand plus stones . These are what we use on the machines and buy hand with a 1/2 drill motor witch would be perfect for you . You can knock out cylinders in 20 minutes and make the perfect. The spring loaded hones are garbage. You can make your money back fast with a real setup . Buy that gear and a nice set of used mics and your making money and your cylinders are perfect every time.

you should try to find a yz85 or something similar that needs work

Loved mine!

Mornin’ bro.

@18:01 You found another 4 stroke that wants to be a 2 stroke 🤣

You the man. 🤘👍🤙

Hello. I need a cylinder head for an Adly 300cc engine. Is it the same as the trx300ex engine? I'm from romania. can you help me ? please😩

Are the rocker arms supposed to have a little side to side play on this model? i went to adjust my sisters valves, but they were tight. The only problem i found was that the rocker arms move slightly from side to side.

Your gonna need a bigher garage for all your projects dude..or just open up a cycle shop..

Didn’t know they made a 300 ex madness

That piston is junk wut do you mean it was saveable

You should do a Collection video an you should get a Polaris 3 wheeler or a tiger 500

My 06 trx300ex starts and goes through all gears but won’t drive any advice?

I'd do a leak down test on the valves

Smokes like an old ford 😂😂

Get a cheap tarp or bed sheet to cover stuff you don't want us to see. Or plastic for painting, you can get a lot pretty cheap

This looks interesting, gl to cing u fixing it!🙏🤯👍🙏👍👍💪

I was wondering if you guy’s could help me out I have a 2008 Kawasaki kfx 450 but you turn it on and it will idle for a little then turn off but you can still drive it but you have to give it a lot off gas and when the quad gets hot it doesn’t want to turn on and it also boggs down and turns off when you shift it from 2nd to 1st gear

Don’t pump the throttle on the 250x or 300ex they have an accelerator pump in the carburetor you will flood them every time.

Suppose to put a really thin layer of silent on the head .If not it throws off the tolerances off on the cam ,and it will eat everything up on the top

I have a couple of Arctic cat four wheelers that need work if you would be interested

Those rings will seat, thats normal to have if theyre new rings. B12 Chemtool even some marvel mystey oil down it's throat. Big difference.

Hey 2vintage, considering your experience wrenching on bikes, how would you deal with stripped bolts on a crankcase?

Sweet machine

I’ve got a 96 300ex and I need front and rear plastics and a air box and lid

I have a 2001 Yamaha 600 grizzly and I can not get it to stop backfiring.che ked timing valves new carb new plug and still...gas keeps boiling too

the piston melted like that because the bore is not round you can put a new piston in it and it will do the same thing

The Rod is different and so is the crank. The 300 has a longer stroke on the crank, which is also why it has a shorter rod.

U got migs lil breeze quad

Those sound like quadrunners lots of stuff from 250s and 300s swap thank goodness, cause most if that stuff has been rendered obsolete.

Hi 2 vintage, I watch your videos every time you post, if you can respond that would be awesome

Gonna need new valve tappet screws before long theyre bout down to unservicable leves.

When are you gona do the turbo quad again

definitely not enough rtv on that puppy..........

Big gaps = big boost 😁

Run some marvel mystery oil into the cylinder let it set for two days. Then retry it out.

When you see gobs of gasket maker it’s never a good sign.

Is that a kvf 650 at the back at the start?

It smokes a ton ! cheech & chong own that ?

That thing smoked so much Cheech and Chong approved lol

U need a leak down tester

Don’t look at the late 80’s Honda fourtrax 250x??

Reverse lever??

I wonder if you can get a big boar kit for the 300ex like the 400ex a cheap piston and cylinder kit

I like to buy that from you

You have got a high and a low compression pistons it may hit the head

Long rod more tork ,short rod more rpm more hp

That thing is screaming fir a new top end.

Haha the 250x👌

@Whoop!

i have a 4wheeler that needs looked at they said it runs but me being home from the hosptail and nursering home i just want to ride it around and i can my dad say he would help me but nothing will get done its a vin on frame is 4uf01atb91t302251 i need some help it is an artic cat i just want to play in our yard with it they said it runs but i want to be on the safe side

My brother has one. Great machine. The tool box is a joke though don't bother using it.

2:00 why?

Oh no , it has orange goo . Never a good sign .

Why didn't you want us looking at the fourtrax?