My stock cct failed(spring) on the front cylinder while i was riding (low speed 3rd
gear 3500). I threw the bike to neutral as it clunked to a stop and i pulled over. I put it in a truck and took it home. tried to start it to diagnose problem (this was before i learned about this common problem) more clanking. So I found broken spring and made my own cct (carriage bolt, tap set, locknuts and seals. VERY EASY) I installed and tightened the mcct and the rest of the bike. knowing that the valves might be bent i still kind of hoped she would just miraculously run perfect. She started right up and would run as long as i could play the throttle. As well as the not staying running, she has a rythmic tap from same area.

I have read as many posts here as i can spend the time. I was wondering if this sounds like it is most likely valve adjustment or maybe the mcct is too tight. or maybe something else. and also to do the valve adjustment myself is the manual the best resource for me. Thanks for the help.................................

 

Yes bent valves, dont run it anymore till corrected.

 

is shimming the valves the only thing i need to do to correct the issue? And is there anything maybe that I should now about the process or should watch for? thanks again.

 

No, not need adjusted,., they are likely BENT, and will need to be replaced. in bad cases valve guide, head, piston damage can be the result.

 

So how do i know that they are bent? Check the valve clearance or something else?

 

You can check valve clearance an indicator of bent valves, if bent they will be open...or large clearance (way outside spec)

a Leak down test would be the best way.

 

Pull the valve cover. Look at the clearance between the heel of the cam and the lifter. Most likely it's got a quarter inch or more of clearance. This is because the valves are bent and not letting it seat properly. This is also what's causing your tapping noise. Did you by chance check the cam timing? If not it's most likely 2 or 3 teeth off at least.

I had this happen to my bike 2 days after I bought it but on mine the previous owner was an idiot and left the front CCT bolts loose and the whole thing just came out! I had about $240 into mine for parts and to pay someone to install the new guides as I didn't have the correct driver or reemer and my guides were broke. I did the rest of the work myself. If you can't do the rest of the work yourself it's going to be a spendy fix!

 

sorry if i should know this but i dont know what a leak down test is. this is my first v-twin (not even sure that has anything to do with it) Also if it is
a bent valve is there anything i might want to do while the motor is open other than fixin whats broke.......?

I was just reading the manual and im pretty sure i can handle the fix, just a bunch of questions to get me there.
Thanks again..........................

 

yes i pulled the camchain off and corrected the timing. not sure how many teeth but it was roughly 1/4 turn of the sprocket off and both in front relative to each other....

 

Wow, 1/4 turn will bend valves for sure.

If you don't know what a leak down test is, that's not the route you want to take. Check the clearances for the easiest indicator, and of bent, start taking the head apart to inspect guides and piston.

 

Going to start taking head apart and going from there. Thanks for all the help. Ill let you all know what i find.

 

Quick write up on Leak down and compression tests
Leak down Test and Compression Test - ThumperTalk

 

working on the bike. down to the valve lifters. is there any way to get them out without the valve lapping tool. I tried the magnet but maybe they are jammed or the magnets not strong enough??? not sure could use some help thanks.