spitfire runs weak

[tnc110]

78 kohler spitfire. Starts easy. runs good off the line, but doesnt ever seem to wind out all the way. And after it is run for a few minutes it gets weaker. It came from indian, but I am at 3500' here in the mountains of NC. does it just need leaned up a bit or are the crank case seals leaking. how do i test the seals for leaks?

[Hoppy]

spray carb cleaner around the seals with engine running....if engines revs your seals are bad and need replacing.

[harleysportster]

If you have a butterfly carb with a 190 main jet, change it to a 175.

[tnc110]

tried rejetting. went up and down and couldnt get it to run good except to leave it where it was. crank seals seem ok...sprayed with carb cleaner when running and it didnt change idle speed. adjusting the air screw does nothing to the way it idles...even if i turn it all the way in. it runs good at first...for about 5 minutes...then it warms up and loses power... plugs are wet... but when i leaned it with a smaller main it wouldnt run. it is a butterfly carb...it looks like a 200 mainjet...hard to read...wouldnt run on a 190 or a 220 any ideas?

[smitfire]

Stator coil

[tnc110]

where can i find the coil for sale?
also who is a good source for skis?

[tnc110]

where can i find the coil for sale?
also who is a good source for skis and carb parts...

[gnfreak]

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... K:MEWAX:IT

[tnc110]

what about the coil?