[vonde001]

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??

 

[five0addict]

is it the right piston? flat top? what kit is it too?

 

[sik50sbrady]

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

 

[vonde001]

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?

 

[five0addict]

does it sound like somethings getting torn up? you probly have something loose somewhere.

 

[vonde001]

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.

 

[Guest]

It is your valves. Set them to .05mm when your flywheel mark is lined up.

 

[vonde001]

It is your valves. Set them to .05mm when your flywheel mark is lined up.

do you know of a good site that can walk someone through this?

 

[five0addict]

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

 

[vonde001]

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

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.

 

[five0addict]

those are easy to miss, and lose. easy to check though too, dont need to pull it completley apart.

 

[vonde001]

bore kit clicking

All fixed..... It was the missing knock tubes that go in between the head and the cylinder.

 

[five0addict]

sweet!

 

[aedwards07]

five-o,

did you ever get the mysterious ticking with your 72cc kit,

 

[jdxr]

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.

 

[five0addict]

well its the wrong piston for the head, so i figure thats what the problem is. it runs like crazy but it needs more than 91 octane for it(13.1) we think its pinging, but nobody knows.

 

[JohnnyB]

- 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 ?

 

[dhanson96]

Could be the valves not set at the right clearance or the spark plug may be too tight.

 

[five0addict]

it IS the wrong piston though.

 

[dhanson96]

Then buy the right one. :lol: