various carb problems - TwoWheelForum: Motorcycle and Sportbike forums
 
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post #1 of 7 (permalink) Old 03-23-2007, 03:54 PM Thread Starter
 
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various carb problems

right so i finally got my bike all back together and what not!

I run the bike and it idles fine, with the choke as well. now when i open the throttle the engine dies, i cleaned the carbs and tried again. same problem engine would die when i open the throttle but now it seems to backfire through the intake on #4

Any help?
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post #2 of 7 (permalink) Old 03-23-2007, 05:00 PM
 
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Are they synchronized properly? that could be a part of your issue, or maybe the float height is too far off.
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post #3 of 7 (permalink) Old 03-23-2007, 09:15 PM Thread Starter
 
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Originally Posted by King Bob View Post
Are they synchronized properly? that could be a part of your issue, or maybe the float height is too far off.

The floats are in spec though they arnt synched, was planning to make my own using some vaccum gauges for cars, check valves and rubber lines! let you know how it goes!
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post #4 of 7 (permalink) Old 03-23-2007, 11:31 PM
 
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Quote:
Originally Posted by KillerR33d View Post
right so i finally got my bike all back together and what not!

I run the bike and it idles fine, with the choke as well. now when i open the throttle the engine dies, i cleaned the carbs and tried again. same problem engine would die when i open the throttle but now it seems to backfire through the intake on #4

Any help?
Quote:
Originally Posted by KillerR33d View Post
The floats are in spec though they arnt synched, was planning to make my own using some vaccum gauges for cars, check valves and rubber lines! let you know how it goes!
When there's a backfire, the first thing I check is if the spark plug wires are on the correct spark plugs. When you cleaned the carbs, did you take the tops off and clean the piston/needles and piston walls? They have to be extremely clean for the air pressure to raise the pistons and lift the needle out of the main jet when you open the throttle. Plus, the air bleeds have to be clear. Don't get any carb cleaner on the rubber diaphrams. As for making the vacuum gauge tool, someone told me that they are not sensitive enough for a bike. I use the old Carb Stix with mercury tubes.
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post #5 of 7 (permalink) Old 03-24-2007, 07:02 AM
 
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Originally Posted by No Worries View Post
When there's a backfire, the first thing I check is if the spark plug wires are on the correct spark plugs.
now that I think about it, this is probably your problem. synching the carbs isnt a bad idea, but if the plug wires are on the wrong plugs it wont help any.
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post #6 of 7 (permalink) Old 03-24-2007, 08:40 AM Thread Starter
 
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the wires are withe the right spark plugs, the backfire is strong enough to actually 'pop' the bank of carbs out of the manifolds! the manifolds themselves due look worn and he o ring behind #4 might have deteriorated i'll have a look at that too, or could be simple as the clamp not tight enough!
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post #7 of 7 (permalink) Old 03-25-2007, 08:30 PM
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Did you use a complete carb rebuild kit?

And whatever you do I would get thsoe synced.

What about the intake gaskets? A leak in those will cause you to have problems. when you get the bike running... spray WD40 or brake cleaner around the intake gaskets with the bike at idle and if the idle changes its inhauling thru those intake gaskets. This will usually ad to running problems over starting problems though.




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