Need a rebuild?

[Caseys 300ex]

Well i have a 98' 300ex and its never been rebuilt. When i shut it of it sounds like its taking a huge breath. The noise comes outta the exhaust and its like its breathing in. The power isnt that good and it seems to dog really bad if its not pinned. Is it time for a topend rebuild

[DVXracer]

Yep.

[416exfreak]

Fo sho....and while your at it go ahead and big bore it to a 330....you wont be dissapointed....;)

[Caseys 300ex]

Does anyone know what the problem is. Like can i just re-bore it or do i have to go the whole nine yards? Thanks for the input.

[416exfreak]

You could just go .20 or .40 over...but my philosophy is, if your going to have the engine pulled downt hat far...then why not go ahead and get all you can out of it...

:ermm:

[Caseys 300ex]

I think ill go little now but if i find a good deal on a 330 kit ill go all the way.:devil:

[cr977]

sounds like your rings are toast

[Caseys 300ex]

Today i rode my brothers and his is the exact same and i could pull wheelies in 3rd while mine barely pulls them in 2nd.


Should i stop riding it until its fixed?:(

[cr977]

Originally posted by Caseys 300ex
Today i rode my brothers and his is the exact same and i could pull wheelies in 3rd while mine barely pulls them in 2nd.


Should i stop riding it until its fixed?:(

i think yes, do what you want, but that same thing happend to my bike, as i was waiting for parts i just kept saying oh one more ride wont hurt it one more ride wont hurt it, then the bike started blowing flames out the pipe i thought cool, next day i went to fire it up, warmed it up, reved it to the rev limiter and burned out of my driveway and then i heard a noise, next thing i know my bike sat in the shop for for 2 months and i was stuck with a 600$ repair bill, the crappy part? my rings and a new piston came in later that day:(

[ZeroLogic]

Don't ride it. Rebuild it just have it bored and honed and buy a pistion. Replace the valve seals while your at it.;)

[Caseys 300ex]

Anyone else?

[ZeroLogic]

Originally posted by Caseys 300ex
Anyone else?

Anyone else for what? Your going to need a rebuild.

[Caseys 300ex]

:p haha alright. Thanks for your guys help!

[ZeroLogic]

Don't forget those seals.;)

Are you going to rebuild it or are you getting a shop to?

[Caseys 300ex]

ahh.. I have a friend that works in a tractor shop and ill prolly have him and i do it together because hes rebuilt his sons quad and hes really good at this kinda stuff. But ill do it myself until i need his help.

[ZeroLogic]

Buy a shop manual. Trust me.

[Caseys 300ex]

Alright thanks for all your help. Id be lost with out it:)

[ZeroLogic]

Many people will disagree but I like using the Clymer manuals. Their cheap (about $20) and has step by step instructions.