RAGDOLL MX Posted November 2, 2007 Posted November 2, 2007 well i pulled my YZ apart tonight and went for the first thing that i thought it might be...and my hunch was right. i slipped a tooth on my cam gear. so tomorrow ill loosen it up and rotate it foward and get it all done. Quote
EY3BA11 Posted November 2, 2007 Posted November 2, 2007 ummm im no rocket scientist... but if you slipped a tooth on your cam gear... i sure hope you plan on A) replacing the chain, B) check for worn teeth on the cam gears and C) change out the automatic tensioner... cuz thats an expensive top end if something goes kerput... Call harry at TT OEM he will get you setup cheap.. Quote
EY3BA11 Posted November 2, 2007 Posted November 2, 2007 and i would be wondering why the intake cam slipped.. Quote
RAGDOLL MX Posted November 2, 2007 Author Posted November 2, 2007 apparently it is a common thing for that to happen. when the revs are up and then you let off it actually loops the chain and retards it. Quote
White Rhino Posted November 2, 2007 Posted November 2, 2007 apparently it is a common thing for that to happen. when the revs are up and then you let off it actually loops the chain and retards it. you said retards it glad it was simple Cole!!!! Quote
EY3BA11 Posted November 2, 2007 Posted November 2, 2007 i havent heard of it being a common thing... check the tensioner dude... Quote
JoeDuner Posted November 2, 2007 Posted November 2, 2007 I had a timing issue this weekend as well. Quote
RAGDOLL MX Posted November 2, 2007 Author Posted November 2, 2007 there was actually a service bullentin out on it. but since i have it torn down that far iam going to clean the carb as well, ill put it all back together tomorrow and see how it runs..if that dosent fix it ill beat my self stooopid Quote
vegas style Posted November 2, 2007 Posted November 2, 2007 there was actually a service bullentin out on it. but since i have it torn down that far iam going to clean the carb as well, ill put it all back together tomorrow and see how it runs..if that dosent fix it ill beat my self stooopid again? Quote
ocean's 4 Posted November 2, 2007 Posted November 2, 2007 I think this is a pretty common issue, I know a couple of my buddies have slipped a tooth on the YFZ450 with fairly new motors in them. Quote
rcjunky3 Posted November 3, 2007 Posted November 3, 2007 i was just curious as to what exactly your bike was doing ? Quote
Sand_YFZ Posted November 3, 2007 Posted November 3, 2007 well i pulled my YZ apart tonight and went for the first thing that i thought it might be...and my hunch was right. i slipped a tooth on my cam gear. so tomorrow ill loosen it up and rotate it foward and get it all done. Is the YZ different than the YFZ?The YFZ cam dots line up on the outside edge of the head at TDC.Hotcams? Quote
SandBox_Kid Posted November 3, 2007 Posted November 3, 2007 Is the YZ different than the YFZ?The YFZ cam dots line up on the outside edge of the head at TDC.Hotcams? Just for us newb's.....where is the outside edge of the head in the pic? Quote
RAGDOLL MX Posted November 3, 2007 Author Posted November 3, 2007 Is the YZ different than the YFZ?The YFZ cam dots line up on the outside edge of the head at TDC.Hotcams? no actually i took the wrong pic. those dots should be 180d (on the outside). but i fixed that after i posted it. and then i tried to pull the carb to clean it. but apparently you need a degree in Physics to get it out. so ill wait till my friend comes over and helps me with it. its still poping on the low end, and it smoothes out on the top. so iam figuring that the slow jet may be clogged. ill have it torn down and cleaned and it should be good. so apparently its a combination of problems. btw, does anyone happen to have a stock plug cap? I have the Icat on it, and i guess that i gave away the stock plug cap. i want to check and see if it is also the Icat that may be the problem. Quote
Sand_YFZ Posted November 3, 2007 Posted November 3, 2007 You should take the ICAT off anyway and sell it to someone on ebay.Dyno tests have shown no improvements with the thing.Those carbs are really easy to work on.So is the cam timing.At TDC the dots on the cam should be even with the surface of the head on the outer edges.You need to line up the timing marks on the flywheel and check to see if its all in order.If its just the carb and it ran good at one time and you have changed nothing i would just clean the carb out.But before all that you may want to ditch the ICAT and try the oem one to see if that fixes you issues. Quote
Sand_YFZ Posted November 3, 2007 Posted November 3, 2007 That is what you cams should look like when in proper timing Quote
SandBox_Kid Posted November 3, 2007 Posted November 3, 2007 That is what you cams should look like when in proper timing Thanks for the detailed info. Can I assume the closeups are of this area on the motor? Quote
powerhouse Posted November 4, 2007 Posted November 4, 2007 That is what you cams should look like when in proper timing not ! he has the dirt bike Quote
EY3BA11 Posted November 4, 2007 Posted November 4, 2007 regardless. replace the chain and tensioner... cheap insurance if it does it again you might not be so lucky.. Quote
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