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Carbs and Fuel System
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post #1 of 5 (permalink) Old 07-07-2011, 10:39 PM Thread Starter
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Here I go. I've been reading some of these threads and it seems like I have a problem that several have gone through.
I have a 1990 750. 12000 miles.

Basically----Bike was running fine then felt sluggish around 70mh. When I exited the freeway it died. It took lots of throttle and hitting the start button to get it running again. Flooded engine, smoke, gas/oil type mixture seems to be coming out of exhaust or exhaust manifold. I had the carbs cleaned and rode off and it ran fine. Then a few days after the cleaning it started doing it again. Exact same symptoms as before but I aslo noticed that the petcock was leaking. Question....Can the leaking petcock cause the bike to lose compression like it is and run lean as well as cause it to run rough and flood the engine, and cause the gas/oil mixture leakage out of the exhaust?
Or am I possiby dealing with something worse like needing a top end rebuild or complete engine rebuild?.

Last edited by marlo2000; 07-07-2011 at 10:55 PM.
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post #2 of 5 (permalink) Old 07-07-2011, 11:50 PM
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Quote:
Originally Posted by marlo2000 View Post
Here I go. I've been reading some of these threads and it seems like I have a problem that several have gone through.
I have a 1990 750. 12000 miles.

Basically----Bike was running fine then felt sluggish around 70mh. When I exited the freeway it died. It took lots of throttle and hitting the start button to get it running again. Flooded engine, smoke, gas/oil type mixture seems to be coming out of exhaust or exhaust manifold. I had the carbs cleaned and rode off and it ran fine. Then a few days after the cleaning it started doing it again. Exact same symptoms as before but I aslo noticed that the petcock was leaking. Question....Can the leaking petcock cause the bike to lose compression like it is and run lean as well as cause it to run rough and flood the engine, and cause the gas/oil mixture leakage out of the exhaust?
Or am I possiby dealing with something worse like needing a top end rebuild or complete engine rebuild?.
First thing to do is eliminate the petcock as the source of the problem.
Get a rebuild kit from Ebay for about $30-40, and install it.

test and report back with results.

Gordon

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Purchased May 16, 2008
Approx.19,300km (12,000 miles)

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post #3 of 5 (permalink) Old 07-08-2011, 12:09 AM Thread Starter
Marvelous is my name.
 
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Quote:
Originally Posted by OlHossCanada View Post
First thing to do is eliminate the petcock as the source of the problem.
Get a rebuild kit from Ebay for about $30-40, and install it.

test and report back with results.
forgot to say that I have one and am having it installed tomorrow. I'll let you know tomorrow if that was the problem. I was just curious if a leaking petcock can cause this to happen.
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post #4 of 5 (permalink) Old 07-08-2011, 08:23 AM
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When the carbs were cleaned,were the floats checked? Bad float would cause part of the problems.

JM2001

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post #5 of 5 (permalink) Old 07-08-2011, 09:07 AM
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I would say no on the leaking petcock being the problem. Unless!!!!!.. you have a leak on one of the boots coming from the carbs.. but even then you would be sucking more air than fuel from the outside.... I am leaning towards trash in your tank and its getting into your carbs.. time to pull em again I would think and drain, check and clean your tank... check all of your hoses for leaks.
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