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Discussion Starter · #1 ·
I'm looking at buying a 300ex that the engine top end needs rebuilt. How is the 300ex to rebuild ? If I'm rebuilding the top should i rebuild the bottom as well ? Where is the best place to get the rebuild kits from ?
Thanks
 

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It isn't that hard to rebuild. It's just about like rebuilding any other kind of overhead cam engine. If the rod bearing is good, I wouldn't worry too much about the bottom end.
 

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agree ^^^^^^.it's not any different than any other top end job..just make sure when you order your parts..gaskets..rings.piston if you need it..that you get the right parts !!..there is alot of after market parts out that you can get just about anywhere..if you want stock..you will need to order them from the dealer..but..it will come alittle bit steeper than after market...oh..and it helps out alot..if you get your hands on a repair manaul !.
 

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Welcome to the forums. Agree ^^^^^ also try Wiseco pistons on the net they offer a complete topend kit.
 

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I agree weisco is a great company.
 

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Just got done doing a whole top and bottom end rebuild on this motor its not that hard definetly get your hands on a manuel and dont be afraid to ask questions were here to help and i probably struggled in the same places as you will. Ill try to get back with you as soon as possible on any and i mean any question you have (theres no such thing as a dumb question) when your dealing with your quad running or blowing up. Welcome to the forums btw!

If you dont mind me asking. How much ru looking at paying for a 300ex needing a topend rebuild? Just to make sure ur not getting ripped off!
 

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Just got done doing a whole top and bottom end rebuild on this motor its not that hard definetly get your hands on a manuel and dont be afraid to ask questions were here to help and i probably struggled in the same places as you will. Ill try to get back with you as soon as possible on any and i mean any question you have (theres no such thing as a dumb question) when your dealing with your quad running or blowing up. Welcome to the forums btw!

If you dont mind me asking. How much ru looking at paying for a 300ex needing a topend rebuild? Just to make sure ur not getting ripped off!
i think he stated that he was going to do it himself ?..if thats the case..he isn't paying anyone.
 

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Not to do it. For the quad its self he said he was thinking about buying it.
 

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LoL i figured its all good bro!
 

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Thats not bad completely stock? And namura is a good kit im sure the only experiance i had was bad but that wasnt there fault wrong size piston= not a fun day! LOL
 

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$600 what do you think? Also what about Namura pistons ?
600 for the whole bike is a steal !!..providing it doesn't have any lower unit problems !!!..if it's just a top end job..new piston..honing or boring..rings..top end gaskets..timming chain might be bad ?...you came out pretty good i'd say..but..if it's a lower end job..yikes..get ready to dish out alot of cash if you don't know how...and send it off to have a dealer mess with it...but..just to rebuild the top end..easy as throwing rocks in a pond..lol.
 

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Discussion Starter · #14 ·
Just around here I can get 300ex for around $1000 thats in good shape. The guy didn't even have a title and he bought it from a junk yard which made me decline it.
 

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Just around here I can get 300ex for around $1000 thats in good shape. The guy didn't even have a title and he bought it from a junk yard which made me decline it.
don't let the title issue scare you..be more concerned about getting a bill of sell..and the vin#'s are still on the bike..and not tampered with..if you buy from a junk yard..or salvage yard that is....a bill of sell..in most states..will save yer butt from jail..if you ever get stoped..and they run it..and it comes back reported stolen..then you got prof where you got it.
 

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