SOHC.co.uk Forums > CB500/550

Carb problems

<< < (2/4) > >>

Yoshi823:
Can carb cleaner be sprayed from the air jets through to the mouth of each carb?
Is the small washer & minute 'O' ring on each airscrew in place?
Can you squirt carb cleaner from the primary jet through to the mouth of the carb?
Which spark plug is the most fouled up? If one is worse than the others it may be a bad spark plug.Are the spark plugs the correct type (D7EA) for the bike?

The needle clip position won't have as much effect on starting as the air screw & primary, so concentrate in this area.

mhirst121:
Well just to update you, I have bought and fit another set of carbs and the bike runs much better. With the old carbs the plugs were all black and sooty, they are much better with the new ones :D
While stripping the other sets of carbs the pilot jets were all 38`s, would these have been fit when a four into one exhaust is used, only ask as out of four sets of carbs only one set had 40`s in?? Will the bike run leaner with the original exhausts on, at the moment I have the four into one on till I get things sorted, don`t want to blue my new pipes if possible.

Cheers for now, and thanks for the assistance again,

MartinH

mhirst121:
Well I have had a play around with the carbs again today. All the plugs seem to be as black as each other and carb cleaner comes out of all the right places. The tickover is much better but I was getting it really bogging down at around half throttle. I pulled the choke on at this point and it just made it worse. So its obviously too rich so I checked the needles, they were in the second from top, I have now moved them to the top groove. Have not had a chance to give it a good run, only noticed the problem with bogging down when I went for the mot.
If it is no better with the needles in this position, am I correct in thinking I need to go down a jet size and move the needles back up??? Slowly learning alot about these carbs, which I suppose its what its all about ;)

Cheers,
MartinH

Yoshi823:
I know this sounds daft, but which position of the choke lever are you using to start the bike...up at the 3 o/c or down at the 6 o/c position...?

Also, how many turns out are you adjusting the air screws...? Are the tips of the air screws clean? Have you tried new NGK D7EA plugs? Do all of the plug caps measure about 5000 ohms?

notobikeparkingtax:
What state is the air filter in and what happens if you run the bike with it removed ?

Are all exhaust downpipes getting equally hot ?

Navigation

[0] Message Index

[#] Next page

[*] Previous page