SOHC.co.uk Forums > CB650
Carb issues
hairygit:
Is the plug wet with petrol or oil?
M0WBY:
Petrol
M0WBY:
Hi
As long as it does not have broken piston rings then I am hoping a good hone and a new set of rings ought to sort it out plus some new valves and/or valve seats.
I think this is why matey boy got shot in the first place... came in only running on two cylinders. Then sat around for a decade. Then he finally thought about doing something with it realised it was shagged and thought I wonder how I can get myself out of this hole. So he got a bent MOT and put it on the bay carefully managing to not mention the bit about it needed a rebuild and blaming the poor running on the carbs!
Oh well you gotta make mistakes to learn from them!
Ce la vie! I think a few beers to drown my sorrows is in order!
But I still want to get to the bottom of the fuel starvation thing!
Cheers
John
M0WBY:
Hi oddjob,
I used the whole bank of VB54a carbs so they have the same float levels in all of them. The only thing that I needed for them off the bank of VB54b carbs were the jets and air screws. I put the old VB44a carbs in my parts bin should I need bits off them in the future (read about 10 years down the road they will be on ebay because I can't remember why I ever kept them!) :D
The VB54a carbs I got off Bitsa where superb quality and look as if they are practically brand new! Which is quite a feat for a set of 30 year old carbs!
I don't know if the float levels are different between the 3 sets or not so I did not chance it.
Cheers
John
M0WBY:
Hi
Got it running real sweet on 3 cylinders! I tought well seeing as I will have to rebuild it anyway I thought to hell with it and I rode it around the block over and over again until the fuel starvation cleared! Anyone fancy a triple?
Going to pull this engine apart and see what it is doing! I reckon the head gasket is shot on number 4 cylinder. The symptoms are lack of compression on one cylinder, there is a spark but it just keep getting the plug wet and not firing, and it is chucking oil out the breather pipe.
Nuts!
John
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