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Open pipe with a baffle in it, so not straight-through but limited backpressure.
Bigger bore cylinder from the King Quad/Arctic Cat - 82mm piston I think, instead of standard 79mm...
HiFlo foam air filter.CV carb is still stock jets, should be about 37.5 pilot. 127.5 main.
Idles okay, starts okay. No big flat spots in rev range.When I had the flatslide TM33 (minus accelerator pump) on the bike it was running fine with same size jets, but had the hesitation exactly where the needle changed taper. (Double taper needle). Going up in jet size made no difference to the flat spot.
Still waiting to see if Allens Performance come through with new needles, ideally one of the single taper needles will resolve the flat spot and I can go back to the TM.
TL/DR: Yes, I was thinking to go up the main, but looking at the page from the Mikuni book, seems like I need a huge jump in main jet to see the improvement I got from raising the needle.
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pdlouche
@Jung
Don't shim the needle, go up on the main. You might want to go up on the pilot too, if there is still a hesitation off idle, but go with the main first.
What size jets are you running and what are the stock sizes? You're running an open pipe and higher flow air filter, right?