tapping/knocking noise

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tapping/knocking noise

i am good with engines and am looking for a second opinion.
i have a suzuki rf900 motor bike that has a tapping/knocking noise that sounds like its coming for the top end.
it is not as lound when you are on the gas but goes louder when you shut off and you can hear it on tick over.
i thought it was a tappet and have done them but its still there.
any ideas what it might be?. i was thinking it could be a small end on the con rod.

Did you re-set the cam chain tensioner when you did the shims?The RF is supposed to have a fragile alternator coupling, a bonded rubber bush that shears. Not had this myself yet (27k miles) but I guess that could make a similar noise.I had a curious rattle on my RF 9, turned out to be the bottom right fairing bracket vibrating against the exhaust

fastfitter wrote

Did you re-set the cam chain tensioner when you did the shims?The RF is supposed to have a fragile alternator coupling, a bonded rubber bush that shears. Not had this myself yet (27k miles) but I guess that could make a similar noise.I had a curious rattle on my RF 9, turned out to be the bottom right fairing bracket vibrating against the exhaust

yep, the tensioner is ok, i made sure all the top end eg timing and stuff was spot on before i started it.as for the alternator i thought about that but have not checked it as i did not know this was a know falut but i will now take a look at this. does the alternator still work if this rubber bush goes or is it more of a cush drive as mine is still working?p.s. thanks for replying mate

Apparently, the alternator still turns so when you look in the end you think it's ok. It's only when you put some load on it like the lights that the coupling can't take it, so the shaft is still being spun by the engine but the weight of the actual alternator stops it spinning.My engine's a little noisey but nothing I worry about - I reckon it's just Suzuki's generous cam end-float.They're supposed to have a fragile 2nd gear too. I've heard a lot about it on the Yahoo RF owners group but I've yet to meet anyone who's actually suffered it.

ok thanks for that, i will take a look at the week end.i dont mind a bit of a noisy engine but this is a bit to loud to ignore. the bike is running like a dream apart form this.the bike has only done 10k so i am i bit disapointed with that but these things happen. i had the rf6 and did 34k in two years with no probs. just one of those things i guess.

Exhaust clamps all snug?

yep, they are all ok the tapping has been there for about 400 miles without getting any worse.it sounds like a very bad tappet but i have done them so i know they are all ok.keep the ideas coming though

ive had a lot of tensioners not adjust up after instalation. make sure it is quite, unscrew the bolts slowly till you here it click and svrew it back in.

ive had a lot of tensioners not adjust up after instalation. make sure it is quite, unscrew the bolts slowly till you here it click and svrew it back in.

Best do it twice to be on the safe side

Sound like a little cam end float to me nothing to worrying about, the on off gas is classic symtom as the chain goes tight and loose. A wide tappit ( a good thing in my book) tends to tap all the time.Kev

thanks for the tips, just have to see how it goes now

You think you've got problems? This is from the Yahoo RF board.............."I have a 94 RF900.This is my 3rd tranny rebuild. I've ordered 5th gear, shift drum, shift fork, output shaft, shift return spring, nut and spacers. None of this stuff is cheap! Last time I replaced 2nd gear, 5th gear, shift forks, shifting palls and pins...etc.... Turns out there was too much play in my output shaft (didn't check that last time).... The RF900/GSX R1100 are prone to blowing 2nd gear. They have weak shifter forks. They bend VERY easily. That is where a lot of the problems start....."I think the yanks must just be a bit heavy footed

hi good evening wondering if anyone could help me I have a rf600 and my there is a funny knocking noise to my engine can I ride it still or is it something to worry about ?

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