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Old 04-30-2013, 10:58 AM   #16
Plaka
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Originally Posted by boxerboy81 View Post
Are the float bowl gaskets in good condition? If not, that can contribute to poor cold starts via a leaning of the start-up mixture.
How does that work?

The bowls are fully vented to the atmosphere. As long as the gaskets are present (which sets the bowl height)....
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Old 05-01-2013, 04:01 AM   #17
Lee 303
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Contrary control filled with 29 years worth of crud

Inspected and repaired as neccesary the carbs on a newly acquired 84 r80rt. Cold stalling problem resolved after I cleaned the dirt and saponified grease out the choke lever detents on the left handlebar control. Now the full setting stays locked. Whereas before you had to hold it with your thumb or it would automaticly creep back to half way and stall out. Now it'll fire right up and stays running (given enough thottle). I no doubt saved all kinds of wear and tear on the switches and relay contacts and starting motor,along with a fair amount foul language.

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Old 05-02-2013, 05:44 AM   #18
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Originally Posted by Plaka View Post
How does that work?

The bowls are fully vented to the atmosphere. As long as the gaskets are present (which sets the bowl height)....
If the gaskets aren't good, they can allow too much air to enter the circuit during start up and then you have difficult cold starting. Trying new gaskets and ensuring the jet in the corner of the bowl is clear might be an easy fix.
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Old 05-02-2013, 06:39 AM   #19
Airhead Wrangler
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Quote:
Originally Posted by boxerboy81 View Post
If the gaskets aren't good, they can allow too much air to enter the circuit during start up and then you have difficult cold starting. Trying new gaskets and ensuring the jet in the corner of the bowl is clear might be an easy fix.
There's a loctite product that I've used on the choke cover in place of a gasket that works great. It doesn't have the tendency to get sucked in like that tiny gasket likes to do. I can't remember the specific product, but it was transparent red and called "anaerobic gasket maker" or something like that. Maybe this stuff? http://www.amazon.com/Loctite-38655-.../dp/B0002KKTTA
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Old 05-02-2013, 05:59 PM   #20
Plaka
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Quote:
Originally Posted by boxerboy81 View Post
If the gaskets aren't good, they can allow too much air to enter the circuit during start up and then you have difficult cold starting. Trying new gaskets and ensuring the jet in the corner of the bowl is clear might be an easy fix.
jet has to be clear. Air is a non issue so long as there is plenty. If the bowl vent is clear, there is plenty. You want the air pressure in the bowl to be at almospheric at all times. Fuel flow is controlled from the bowl, not air.
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Old 05-03-2013, 02:56 AM   #21
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If air is too much, the enrichener won't be as rich, or rich enough for the start up mixture.
I'm not talking about air from the bowl, but air from outside the bowl. If the bowl gasket is faulty and allows too much air in via the "bowl to carb body" interface, the extra air may dilute the startup mixture, then starting can be difficult.

The blue arrows bottom left in the picture above, above the fuel take up tube, show the potential pathway of air, which should be fuel...if the gasket is faulty there, it may be the problem.


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