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Discussion Starter · #1 ·
I know there was some talk in earlier posts about loud clicking noises after putting a bore kit on. I just but a 72cc kit on with stock cam and carb and I got the noise. I think its coming from the cam side of the engine but Im not sure.



Just wondering how other people fixed this, or if it will just go away??
 

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adjust ur valves again, they click when there to loose.
 

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Discussion Starter · #4 ·
bore kit clicking

Its a stock xr70 cylinder, with the stock head and a flat-top 47mm piston from Dratv, new gaskets.



Even though I did not mess with the head or cam do you think it could be the valves?
 

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Discussion Starter · #6 ·
Its more like a loud click noice. It kinda goes away when I rev but its pretty noticable when it idles.



I losend the cam chain roller bolt and it got louder, then went around a re-tightened everything. I just want to get a better idea of what it is before I tear the engine down again.
 

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its easy, get yourself a feeler gauge from you honda shop. all you need to do it take off the two round lifter(name??) covers off the top/front and bottom/front of you motor. loosed the 9mm nut, and put the feeler under the ajuster. ajust so the gauge just fits bettween the ajuster bolt and the top of the valve. tighten the nut and turn the engine over a couple of times and check the gap again. (ps do this in the midstroke{when both valves are closed fully and theres no pressure against the ajuster})

if i missed anything please fill it in for me :oops:
 

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Discussion Starter · #10 ·
five0addict said:
its easy, get yourself a feeler gauge from you honda shop. all you need to do it take off the two round lifter(name??) covers off the top/front and bottom/front of you motor. loosed the 9mm nut, and put the feeler under the ajuster. ajust so the gauge just fits bettween the ajuster bolt and the top of the valve. tighten the nut and turn the engine over a couple of times and check the gap again. (ps do this in the midstroke{when both valves are closed fully and theres no pressure against the ajuster})

if i missed anything please fill it in for me :oops:


Sounds to easy.... I'll do that first, but I went and re-read the twobros install and I cant say with 100% assurance that I put the little knock pins in that go in between the head and cylinder. :oops:
 

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Mine has a slight ticking noise too. Not too bad but you can hear it at idle. When the engine gets hot, it will knock at low rpms under a load. I'm gonna try a colder spark plug and see how that works.
 

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- It could be octane , timing chain or interference related by the way you explain it .

- But as you say , if it's the wrong piston . Maybe the piston is hitting the head , valves , spark plug or hitting the carbon build up on the head ???

Are you sure the cam chain + tensioner are ok ? It could also have a stretched chain , bound up tensioner or tensioner spring that is weak ?
 
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