Originally Posted by
cherokee180c
Can anybody explain how to set up the idle gap to the right point for the GoTech 7 port? From reading the posts I gather that this should be somewhere around .7 - 1 mm? Is it just a visual thing after you remove your air filter? If so what does 1 mm look like, visually? I hate to ask dumb questions, but I think I have been suffering from an idle setting that is too high to compensate for the LSN set possibly too rich.
Again from reading the posts I think I am supposed to set the Idle gap to 1mm, then set the HSN for smoke and good power, then come back and work the LSN till I get a consistent idle, is that correct? My motor already has about 3/4 a gallon on it, but has been leaning out a bit at the end of runs. Lastly, can you hurt the engine with a LSN that is too lean if your high speed is blowing good smoke? Not sure how to set the LSN correctly, so thanks for any help.
Cherokee180c - The idle gap should be .7mm - 1mm, which is not very big. If you set it and it looks too small to you, then it is probably pretty close. If your buggy keeps stalling when you button off, then it probably is to small, so go just a smidge wider, but not too much. You are on the right track with the last part of your post regarding setting the LSN.
Get the engine and chassis nice and warm (run about 1/2 to 3/4 of a tank through on the ground at bashing or race pace). Refill to half a tank then tune the HSN for near max power with good smoke right to the end of the rev range. Now adjust your LSN so when you bring your buggy in it idles consistantly without "loading up" and suddenly dropping revs (sure sign of a too rich LSN). If it does load up and drop revs, lean the LSN 1/8 of a turn at a time and do a little run around and bring it back in and try again. Keep adjusting at 1/8 increments until you have a smooth idle that doesn't drop. Now run it around a bit more and bring it to a stop for 6 - 10 seconds then give it full throttle. Buggy should pull away smoothly with consistant smoke from take off to full speed. If it bogs or seems flat then the LSN is still out.
Another good test for the LSN is to have your buggy at idle then pinch the fuel tubing off about 1" from the carb. You should notice a slight (about 500 - 800 rpm) increase in revs, then the motor should die withing about 4 - 6 seconds. If the motor dies straight away with no increase in revs then your LSN is too lean. If the motor revs up sharply or runs for longer than 4 - 6 seconds then your LSN is too rich. Once you have the LSN set correctly now adjust the idle gap if necessary to give a good idle speed.
It sounds like your LSN is too rich and your HSN is too lean. This is whats causing your engine to run lean or too hot at the end of a tank. Engine runs ok and sounds ok, but you are missing out on good crisp bottom end and more power at the top. Phew !! bit long winded, but there is no quick way to explain this. Hope this all makes sense and gets you running better.
