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I'm putting together a GS300L for my daughter's first bike and need a bit of information on the carbs, so I hope you folks won't mind a few questions.
First, what the heck are these carbs? They're Mikuni's with no visible model number, have a round slide, oval venturi, and use a pull-knob on the side of the carbs to actuate the enricher, and that's about all that seems distinctive.
I've already done a search here and found some excellent info on the GS300 -- Thanks Folks!!! -- but didn't see a mention of which model carb this bike uses.
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There seems to be a wierd fuel supply problem going on. I've checked the fuel tap and run the bike on prime but it's as though the fuel bowls aren't venting properly -- or something. The bike will start and run OK for a while and then the idle rises and the bike stalls out. It feels like the fuel level in the float bowls is changing and leaning out.
I've also put on a clear fuel line and filter to monitor the situation and when it stalls there's fuel in the filter and line. After sitting for a few minutes the fuel drains into the carbs and the bike will start and run again. That's with either the gas tank installed or a vented auxiliary fuel tank, so it's not a fuel tap or supply problem from the tank.
Anybody got an idea on this? Perhaps a blocked bowl vent somebody could steer me to?
Also... What's the float setting for these carbs? The previous owner was not a great mechanic and I'm afraid he might have screwed it up. The needle valves look good, though.
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I can't find a mixture screw on the carbs but I did find caps on the carbs that look like they might be EPA covers over the mixture screws. They're physically located on the top side of the carbs next to the enricher control shaft on the outlet side of the carbs.
Can anyone verify that the mixture screws are there before I start drilling?
Thanks,
Jim
First, what the heck are these carbs? They're Mikuni's with no visible model number, have a round slide, oval venturi, and use a pull-knob on the side of the carbs to actuate the enricher, and that's about all that seems distinctive.
I've already done a search here and found some excellent info on the GS300 -- Thanks Folks!!! -- but didn't see a mention of which model carb this bike uses.
------------
There seems to be a wierd fuel supply problem going on. I've checked the fuel tap and run the bike on prime but it's as though the fuel bowls aren't venting properly -- or something. The bike will start and run OK for a while and then the idle rises and the bike stalls out. It feels like the fuel level in the float bowls is changing and leaning out.
I've also put on a clear fuel line and filter to monitor the situation and when it stalls there's fuel in the filter and line. After sitting for a few minutes the fuel drains into the carbs and the bike will start and run again. That's with either the gas tank installed or a vented auxiliary fuel tank, so it's not a fuel tap or supply problem from the tank.
Anybody got an idea on this? Perhaps a blocked bowl vent somebody could steer me to?
Also... What's the float setting for these carbs? The previous owner was not a great mechanic and I'm afraid he might have screwed it up. The needle valves look good, though.
------------
I can't find a mixture screw on the carbs but I did find caps on the carbs that look like they might be EPA covers over the mixture screws. They're physically located on the top side of the carbs next to the enricher control shaft on the outlet side of the carbs.
Can anyone verify that the mixture screws are there before I start drilling?
Thanks,
Jim
, some have them on the outside side. See recent post regarding another 450's carb issues for pics.
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