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Post by ilovenxstage on Mar 13, 2013 8:58:17 GMT -5
I've got a high flow air filter that I'd like to use, but I've tried running it with  main and 35 pilot jets and it was running so lean it was belching smoke. The original carb had a 75 main. I thought an /35 combination would be big enough for the new filter. Should I try something as big as a  or even 100 main, and what should I use for the pilot. The engine is a secret 63. Would that make a difference in the required jet size? |
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Post by millsc on Mar 13, 2013 9:20:13 GMT -5
should be big enough what kind of filter is it? I'm running an  on my roketa with 100cc big bore kit and uni stock exhaust |
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Post by ilovenxstage on Mar 13, 2013 9:26:44 GMT -5
It's a generic chinese made cone style filter. I've checked for air leaks and found none, and it runs with the right mixture with the stock airbox. I've also tried re adjusting the A/F screw with the new filter on and its still running too lean. I wonder if I have something else restricting my fuel flow.
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Post by millsc on Mar 13, 2013 9:35:43 GMT -5
its still cold out so it possibly could use a bigger jet try an |
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Post by ilovenxstage on Mar 14, 2013 9:37:13 GMT -5
I was tinkering with it some more and discovered that I did actually have a very small air leak because I didn't have the clamp holding the filter tight enough. It's running much better now, although still a bit lean (possibly because the temperature is so cold right now). There is a very noticeable change in sound when the main jet kicks in and I have a strong burst of acceleration. The problem I'm having now is occasionally the main jet doesn't seem to kick in at all and I have to back off the throttle several times and apply it again until it kicks in. That happened once going up a hill and I just about stalled with a line of irate cagers behind me! Any ideas why it might be doing that? It's never done it with the stock airbox. Should I even be running it when it's doing that?
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Post by ilovenxstage on Mar 14, 2013 19:20:42 GMT -5
I checked the spark plug and it indicated that its still running lean. I'm just going to put the stock airbox back on until I can get a bigger main jet. just doesn't seem to cut it for this particular filter. I'd rather have a clunky restricted filter then take a chance on overheating and blowing my piston! |
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main and 35 pilot jets and it was running so lean it was belching smoke. The original carb had a 75 main. I thought an 
or even 100 main, and what should I use for the pilot. The engine is a secret 63. Would that make a difference in the required jet size?
on my roketa with 100cc big bore kit and uni stock exhaust