61 mm cylinder block

[sniping_area]

it seems the noise is coming from the cylinder head. did you removed the lever (see picture) inside the camshaft sprocket which activates the decompression pin through centrifugal action? without the decompression pin it would be free to bounce and create noise. this would not affect the engine performance but would create knocking noise.

i didn't remove my lever... i don't think its coming from that part...

 

[sniping_area]

boldstardex also didn't removed that lever.. both our bikes don't sound like that..

 

[wvlfonlus]

it seems the noise is coming from the cylinder head. did you removed the lever (see picture) inside the camshaft sprocket which activates the decompression pin through centrifugal action? without the decompression pin it would be free to bounce and create noise. this would not affect the engine performance but would create knocking noise.

i don't recall removing the decomp pin...funny thing is, it only makes that "tukotok" sound when it is idle..once you rev the engine it becomes smooth...i haven't open the engine yet, it might be a loose bore..snipping area might be correct...i'll have it check with a compression tester at yamaha 3s probably tom.

i'll be taking note of all your input...so far decomp pin and loose bore might be the cause... i don't believe its the conrod since yamaha conrods are the best...

 

[aizarn20]

sir do we need to change into big head when changing to big block?is this proper combination sir?camshaft turbo+r v spring+r ignition coil+r clutch spring+r clutch plate+60 mm block+r crankshaft....what is lacking sir?i have a rextor cdi now...this mods havent install yet....im finding a good mechanic...they suggest me in egv aka bong in tarlac...

 

[saDam]

have the same probs with tiny snipeee..but we have figure out that noise and that is the timing chain tosser.. we replaced the timing chain and chain tosser with new one and the noise is gone..

 

[Rolly]

have the same probs with tiny snipeee..but we have figure out that noise and that is the timing chain tosser.. we replaced the timing chain and chain tosser with new one and the noise is gone..

you might be referring to the chain tensioner bro..

 

[Rolly]

i don't recall removing the decomp pin...funny thing is, it only makes that "tukotok" sound when it is idle..once you rev the engine it becomes smooth...i haven't open the engine yet, it might be a loose bore..snipping area might be correct...i'll have it check with a compression tester at yamaha 3s probably tom.

i'll be taking note of all your input...so far decomp pin and loose bore might be the cause... i don't believe its the conrod since yamaha conrods are the best...

"it only makes that "tukotok" sound when it is idle"... the more I suspect the lever is causing the noise because during idle, the revolution of the engine is not that smooth and causes the lever to bounce back and forth. at high revolution, centrifugal force makes the lever to just stay outward and not bounce back and forth.

"i don't recall removing the decomp pin".. if you changed your stock camshaft with a racing camshaft, there is a great possibility that the installed racing camshaft has no decompression pin.

 

[saDam]

you might be referring to the chain tensioner bro..

yup..thats chain tensioner..thanks.! im new user of t135..

 

[sniping_area]

sir Sadam are you from cotabato...???

 

[thopiang]

sir Sadam are you from cotabato...???

yep yep yep, team leader ng sex-c boys yan hehehe

 

[traxxas-modifier]

tukutok noise might be the decomp pin assy

original

remove decomp assy

installed

 

[sigea2]

And what benefits do we get out of removing it sir?

 

[Rolly]

original

this is what i am talking about... this is a much better illustration than the drawing from the manual.

 

[Rolly]

And what benefits do we get out of removing it sir?

Benefits: less noise and vibration in the cylinder head.

 

[Rolly]

the only disadvantage of removing the decompression pin assembly is that you have to rivet it again in place if you put back your original camshaft and you wish to have a decompression pin installed.

 

[wvlfonlus]

we did not remove the decomp pin..ill check the timing chain if its loose.

 

[wvlfonlus]

got the chance to crack open my engine yesterday...and just as i suspected loose bore..... next step CMR 62mm....I'll post pix and videopf the assembly tomorrow....my wallet feels 1000 p lighter...

 

[sniping_area]

so far my bike doesn't sound like that...

i go for the conrod bearing or the loose bore...

did you try changing new bore kit??

Bingo!

 

[kit]

@wvfonlus, hows the 62mm goin sir, any updates

 

[sniping_area]

pictures please