First Generation Ascots > The Thumper Years: Modified To Full Customs

FT 500 modified

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Chronic:
This weekend i attended a Bikeswap, and found a Mikuni Flatslide 37 mm carburator!!!

It´s one mm to small to fit perfekt, but not a big job to fit it properly...

Anyone who have thoughs about this carburator on the FT?

J6G1Z:
Are you sure that it's not a 38mm?

White Brothers used to offer a 38mm carb kit back in the day. Usually it was installed along with a larger bore & a higher performance camshaft. A 38mm might be a bit large for a stock street Ascot. A 36mm might be a better fit. I have a 38mm Mikuni flat-slide that I've been hanging onto for the future & have considered trying it on my bike. One of the things that will make the fit easier, is a 90 degree elbow at the carb end of the throttle cable. That will allow for more clearance at the top of the carb.

Here are some jetting specs from ThumperStuff for a 38mm Mikuni flat-slide that was mounted on a Yamaha SR-500.
4.0 Slide
190 Main
55 Pilot (That may be rich & could possibly respond better to a 25-30 Pilot)
389P2 Needle Jet
6FJ40 Needle

Good luck & please let us know what you find out.
J.

Chronic:
Well i messured it to 37 mm inside forward pointing outlet ( do i sound like native American ???)

It also have bracket for installing double trottle Cable, like stock on the FT

Chronic:
Here´s a pic

J6G1Z:
Hmmm... I've never seen one like that before. Does it have an accelerator pump?

J.

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