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Post by 90GTVert on Oct 22, 2011 15:02:18 GMT -5
Use a vacuum port on the intake.
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Post by brandonscoot on Oct 22, 2011 16:34:37 GMT -5
okay thats a good start, it was a 2 stroke right?
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Post by lshigham on Oct 22, 2011 17:44:59 GMT -5
Yes, intriguingly, a 172 drag race motor and my 70cc used the same jetting, so the carb doesn't seem to be too fussy about what it's strapped onto.
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Post by brandonscoot on Oct 23, 2011 18:46:41 GMT -5
so i put the vaccume port to the intake but i think it may have too much suction. when i gas it im able to semi- haul ass but when i let off the gas it starts to spray out of the hole on the bottom of the bowl, i tried plugging the hole and gas squirted out every other hole. haha like 2stokd said, this thing is a dirty leaky mess. i like it though, its been working well, i pretty much have the cable fixed now and its actually driveable on the st
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Post by 90GTVert on Oct 23, 2011 20:06:21 GMT -5
Anything on the bottom of the bowl should be a drain for the bowl or an overflow. I'd think perhaps float height could be wrong or something isn't hooked up in the right spot. The hose on the intake is going to the petcock, not the carb, correct?
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Post by brandonscoot on Oct 23, 2011 20:45:40 GMT -5
yes right, hose on intake runner goes to the petcock. i was kinda thinking it could be the float too, but i havent messed with it. how high should it be? the float height is what stops fuel coming into the carb from the tank right?
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Post by 90GTVert on Oct 23, 2011 20:55:09 GMT -5
Right. With most carbs it should be set parallel with the carb body if you're holding it upside down.
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Post by bigkahuna427 on Oct 24, 2011 9:14:21 GMT -5
Try this simple fix first.... The least little piece of debris thread insect leg etc. can get stuck on the needle and seat valve. Once this happens the valve cannot seal even if the float is completely submerged. Fuel continues to pour in and because the float is trying to close the needle and seat there is no chance the debris will get dislodged. So pinch off the fuel line and let the engine run out of gas. Now the float has dropped all the way down and hopefully when fuel starts flowing over the needle valve the debris will wash off. This is an old mechanics trick from way back.
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Post by brandonscoot on Oct 24, 2011 21:00:38 GMT -5
okay kahuna nice, ive done that quite often for the purpose of making bowl removal for jet changing less messy but never in the sequence you say... an 90gt, k im gonna do that adjustment, ill report my findings later....
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