Idling @ 8000 rpm

[MSTRS:Me]

Glad to hear the 'idle' issue has been resolved. Probably was the butterflies being held open, eh?
As for the rest...after a semi-major strip down, it is common to experience odd bits of fluid/smoke in the initial few minutes after startup.
Change that old oil now. Filter too. You don't know what might be lurking in there...

[cbfb]

Glad to hear the 'idle' issue has been resolved. Probably was the butterflies being held open, eh?
As for the rest...after a semi-major strip down, it is common to experience odd bits of fluid/smoke in the initial few minutes after startup.
Change that old oil now. Filter too. You don't know what might be lurking in there...

Yeah could well have been that, one of those annoying things we'll never find out for sure now it's stopped. Also the inlet manifold might not have helped.

You reckon I should change my oil before starting her up again? Was gonna fire her up again for a few minutes first to see if I could get more clues to go on.

[Katman]

Yeah could well have been that, one of those annoying things we'll never find out for sure now it's stopped.

Don't worry - I know for sure.

[cbfb]

Don't worry - I know for sure.

Aye well you know better than I do, will go with that

[MSTRS:Me]

You reckon I should change my oil before starting her up again? Was gonna fire her up again for a few minutes first to see if I could get more clues to go on.

A prudent person would. Then change oil and filter again once 'happy' with the way the engine is running etc. That way you're not running old crap through, the first lot picks up anything that might have got in there during the stripdown/rebuild and you know you have fresh oil when you start riding it.

[cbfb]

A prudent person would. Then change oil and filter again once 'happy' with the way the engine is running etc. That way you're not running old crap through, the first lot picks up anything that might have got in there during the stripdown/rebuild and you know you have fresh oil when you start riding it.

Hmmm, bugger that's gonna cost a bit. But hell yeah I deinitiely agree it needs doing pretty soonish, prob heaps of dust and shit got in there, was careful but just dust floatin around in atmosphere will get in.

[pete376403]

I'm getting a bit concerned that the oil is getting pumped up into the rocker cover and there's some sort of obstruction preventing it from getting back down to the crankcase? That would suck.

Oil drains back via the cam chain tunnel - a pretty big hole and about the only way you'd ever obstruct that would be to leave cleaning rags inside the cam cover.

[cbfb]

Oil drains back via the cam chain tunnel - a pretty big hole and about the only way you'd ever obstruct that would be to leave cleaning rags inside the cam cover.

OK, nope definitely no rags left in there.

Started her up again tonight and left running for around 5 mins. Smoke from around rocker cover seemed to decrease quite a bit to barely anything now.

There is a fair bit of white smoke from the exhaust though. Did not decrease as engine warmed up and does not decrease when the throttle is opened up.

Idle is somewhat erratic (varies by +/- 500 rpm).

Most worringly, there is STILL fuel coming from the fekkin overflow pipes on the carbs. I have checked the needle valves and floats, I am at a bloody loss as to what is wrong with it.

Beginning to think it's time I admit defeat and take it to a mechanic but of course I can't ride it with fuel pissing out and I don't have a trailer

Anyway I've been consistently wrong with my assumptions so far so not even gonna try and explain this one, but if anyone has any idea what's going on please let me know ...

And again many many thanks for all your help.

[pete376403]

tap against the float bowls (screwdriver or whatever you can get in there) while the motor is running. Might help seat a sticking float valve. (obviously, don't bash the shit out of them)
The excess fuel *might* be the source of the exhaust smoke.

[Katman]

Most worringly, there is STILL fuel coming from the fekkin overflow pipes on the carbs. I have checked the needle valves and floats, I am at a bloody loss as to what is wrong with it.

Possibly leaking past the o rings on the needle valve bodies.

[Max Preload]

Possibly leaking past the o rings on the needle valve bodies.

Yeah, the float valve seat o-rings. The valve may well be closed, but it's going around that and overfilling the float bowl...

Replace the o-rings with VITON. Nitrile doesn't cut it.

[MSTRS:Me]

Erratic idle prolly due to overfull float bowls. As others have said, the needle cutoff valve/s may not be sealing. But ALL of them at the same time seems a little unlikely. Did you dick with the float height tabs when you had the carbs apart?
White smoke from the exhaust is water vapour. Could have several causes...
either condensation in the pipe which will fix itself, or you have a leak between the water jacket and (a) cylinder.
If it's a leak, a falling water level and/or milky oil will confirm.

[cbfb]

tap against the float bowls (screwdriver or whatever you can get in there) while the motor is running. Might help seat a sticking float valve. (obviously, don't bash the shit out of them)
The excess fuel *might* be the source of the exhaust smoke.

Yep will give that a crack (although still would prob try and fix permanently but that would tell me more). There are pipes linking each bowl's overflow, will rip them off so I can see which carb(s) leak(s).

You reckon excess fuel would be white though?

Possibly leaking past the o rings on the needle valve bodies.

That sounds logical, thanks.

Yeah, the float valve seat o-rings. The valve may well be closed, but it's going around that and overfilling the float bowl...

Replace the o-rings with VITON. Nitrile doesn't cut it.

Sounds good, what is Viton? Will I find it at Ripco or Supercrap? Is it a sealant? I have some rubber grease but don't know about using that??

Erratic idle prolly due to overfull float bowls. As others have said, the needle cutoff valve/s may not be sealing. But ALL of them at the same time seems a little unlikely. Did you dick with the float height tabs when you had the carbs apart?
White smoke from the exhaust is water vapour. Could have several causes...
either condensation in the pipe which will fix itself, or you have a leak between the water jacket and (a) cylinder.
If it's a leak, a falling water level and/or milky oil will confirm.

Ah, the overflow pipes are joined so that might have been a bit misleading. I suspect in reality only one carb is leaking (hopefully).
Nope, measured float height and they were all OK.
Yeah that doesn't sound too good. I took the rad cap off last night and what I did notice was a fair bit of pressure. Level had gone up slightly instead of down. Engine was hot tho but I remember when I had a leaky head gasket on my car it blew the crap out of my cooling system...
In the process of changing the oil as you suggested, we'll see if that changes colour (bloody hope not it's not cheap).



THANKS AGAIN ALL .... !

[cbfb]

Erratic idle prolly due to overfull float bowls. As others have said, the needle cutoff valve/s may not be sealing. But ALL of them at the same time seems a little unlikely. Did you dick with the float height tabs when you had the carbs apart?
White smoke from the exhaust is water vapour. Could have several causes...
either condensation in the pipe which will fix itself, or you have a leak between the water jacket and (a) cylinder.
If it's a leak, a falling water level and/or milky oil will confirm.

p.s. MSTRS, you don't reckon the white smoke could be excess fuel from the leaky carb or oil I used on the pistons/bore/just about everywhere when I reassembled the block?

[MSTRS:Me]

Excess fuel (rich) burns black. Excess oil burns blue.
As a rule.