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Petrol coming out of rh exhaust mc21


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joeys boy

 
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Petrol coming out of rh exhaust mc21

Fri Apr 19, 2013 8:44 pm » Post: #1 » Download Post

Hi all just a query fired my bike up last week using funel as tank was getting sprayed and was spot on, got the tank back on today and fired it up and quite a bit of petrol came out of the rh exhaust but seem to clear up when I left it running and reving it.

Any ideas what may have caused this, the lh exhaust was normal Rolling Eyes
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paul

 
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Fri Apr 19, 2013 9:33 pm » Post: #2 » Download Post

I would say the float in the carb is leaking, so when left sitting it let some fuel through
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TuckerBag

 
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Sat Apr 20, 2013 8:58 pm » Post: #3 » Download Post

OK, so, petrol out the RH exhaust implies that something is wrong with the LH carb.
If the carb overflows due to the needle valve not shutting off properly, then the petrol should run out of the overflow tube, so I would check that the overflow tube is not blocked.

However, if the float is not floating, then it cannot shut the needle valve, so I would chuck the float in a tin of petrol and check that it floats.
While at it I would also set the float level to 13mm.
I would also use a cotton bud dipped in brasso to clean the sealing face of the needle valve (carb body) and inspect the rubber sealing face of the needle valve to make sure it is in good condition.

Possibly pull the fuel tap out of the tank and see if it has any "gunk" in it.
Maybe put an inline filter in the fuel line from tank to carby just in case getting the tank painted resulted in "gunk" getting into the tank, and hence petrol, causing the needle valves to jam open.
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joeys boy

 
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Sun Apr 21, 2013 7:13 am » Post: #4 » Download Post

Cheers buddy il fire her upbif still the same il take the carbs off. You say the lh carb for rh exhaust?

Cheers
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joeys boy

 
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Sun Apr 21, 2013 7:15 am » Post: #5 » Download Post

Cheers buddy il fire her upbif still the same il take the carbs off. You say the lh carb for rh exhaust?

Cheers
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TuckerBag

 
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Sun Apr 21, 2013 9:35 am » Post: #6 » Download Post

Yeah, RH pipe comes from LH cylinder and vice-versa.
But,.. you already know that.
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TuckerBag

 
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Sun Apr 21, 2013 8:41 pm » Post: #7 » Download Post

Here's a helpful link:
http://nsr250.net/forums/viewtopic.php?t=5322
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Andy
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Sun Apr 21, 2013 8:59 pm » Post: #8 » Download Post

TuckerBag wrote:
Yeah, RH pipe comes from LH cylinder and vice-versa.
But,.. you already know that.

You may want to check that, regarding an MC21.
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TuckerBag

 
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Sun Apr 21, 2013 9:06 pm » Post: #9 » Download Post

Oh, whoops. Bum steer. My bad. Sorry.
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joeys boy

 
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Mon Apr 22, 2013 11:51 am » Post: #10 » Download Post

Cheers guys think shes sorted fired her up last night all is grand im thinking perhaps i had a stickey float or i flooded her starting her up.

Will be taking her for her first MOT in 6 years shes been fully rebuilt from the ground up in the last 18 months.

Iv never rode her so not sure what to except!!!!!

Thanks

Simon
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