Super rich Comet

Simon Dinsdale

VOC Machine Registrar
VOC Member
VOC Forum Moderator
Bill
My experience is a little bit of black smoke indicates rich mixture.
A little bit of burning oil is a white/blue occasional smoke.
A lot of oil burning is plumes of white smoke.
My twin last year had sumped and I didn't realise until I kicked it. The bike felt like turning over treacle, but it fired and immediately filled the whole street with plumes of white smoke. It was that much I couldn't see the neighbors house across the street. It looked white in colour to me.
Stopped the bike, drained the sump and all was well again. That's on a bike that doesn't usually burn oil.
Simon
 

Bill Thomas

Well Known and Active Forum User
VOC Member
Ok Simon, It must be my eyes then, My Comet caught me out this year, I looked in the tank and it was not low,
But when I started it, There was enough to make a cloud !, but soon over.
Cheers Bill.
 

Martyn Goodwin

Well Known and Active Forum User
Non-VOC Member
never seen this new floats.Erik
So here is a picture
1526520212981.png


You can purchase a kit from Burlen Fuel Systems in the UK to update any older model of a Mk1 so its OK with fuel containing ethanol - this float is part of the kit. It is standard in the Mk1 Premier series. Not expensive.

This is what is in the upgrade kit

1526520710718.png



You can get a like kit for Monoblocs as well.
 

Bill Thomas

Well Known and Active Forum User
VOC Member
I have just purchased a series C Comet and having issues tuning it to run correctly. It came with a 930/71 Mk1 concentric carb, which was worn, so I replaced it with a new premium one from Burlen services. I used the same settings as the one that I took off but it ran very rich. Wet sooty plug and white smoke from exhaust. I've reduced the main jet from the 270 that was fitted to the previous one and gone down to a 250. I've replaced the throttle valve to one with a higher cutaway and moved the clip on the needle up to the top notch. None of this seems to have made a difference. The bike runs ok for short runs but the plug and clouds of white clearly indicate it's far from right. Anyone using the same carb and can let me know their settings or suggest other changes I can try. Many thanks.
Oil burning could be because of worn valve guides, Rather than piston,My Comet smokes , But still goes well,
With good compression. Cheers Bill.
 
Top