[bajaCRF03]

i know 03 its a lil old buts its mine i bought it for a good price and i think the timing chain may be streched and i am having some other issues i need some help guys this is my first 4 stroke so please be gentle and patient
i have it most of the way taken apart and i have been doing this by using the clymer manuel, i cant ride it till i fix the backfire issuse

[crfsonly]

welcome to CRF's Only. what leads you to believe the timing chain has stretched? if it is the original chain, time to change it regardless.

ken

[bajaCRF03]

i dont really know for sure i just wanna rule it out i have put the carburetor back to factory from the last owner and cleaned it, stopped the backfiring for the most part and took it for a ride on the track, the next weekend started it and had a blue backfire come out of the tail pipe. the valves are still in spec but will need to be changed shortly, fuel filter is good air filter has been cleaned, i am at a loss

[crfsonly]

the stock jetting is most likely lean and will cause decel popping. get the JD jetting kit we offer and get the jetting spot on and work from there. definitely check the timing and the valve clearances. if either is off it won't matter what you've done to the carb.

ken

[bajaCRF03]

is their a way that i can check the timing to know that im good, cause i check all the marks at the same time right side is good with cam but left is of by just a hair

[crfsonly]

check our how to on checking valve clearances. this will show you how to verify timing. what is off? timing or valve clearance?

[bajaCRF03]

ok so i checked the timing, so i used the straightest piece of steel i could find to make sure it was good looks good put the bike back together, turned the fuel on and noticed that the fuel joint is leaking need help i am going to be deploying soon WANNA ride

[crfsonly]

fuel joint? do you mean the petcock or do you really mean the "fuel joint set" on the carb? if the latter, it is likely the o-rings. if they are not damaged you may be able to get them to expand by soaking them overnight in ATF. then make sure you use a quality waterproof grease on them when installing. in either case, time to replace them. these come in the gasket set:

http://www.crfsonly.com/catalog/product ... ts_id/3486

ken