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General Category >> Rubber Side Down! >> Flyin' High
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Message started by HJH on 03/16/11 at 19:33:01

Title: Flyin' High
Post by HJH on 03/16/11 at 19:33:01

The high altitude '02 Savage, now outfitted with a Supertrapp with 6 plates, K&N filter and some 1/2 inch holes drilled in the filter cover, 45 pilot, 145 main, 1/2 spacer on the needle, Raptor petcock, in-line fuel filter, and weather-checked tires in need of replacement, started with a roar when I turned it over this afternoon. After playing with the idle and mixture, I took it for a ride, and got it up to 90 before backing off. Rolloff indicated the main is a little lean, as revs increased slightly when I backed off to 7/8 throttle, but not much. It certainly didn't slow down. I've got 147.5 and 150 main jets coming.
Pilot is a bit of a puzzle, as it doesn't slow much as the screw is turned in, and only slightly at 2 1/2 turns out. I expected amore noticeable effect, I guess. I'll try again tomorrow with the idle set higher, but I'm not getting any great increase in revs, just small changes. It's hard to believe I need to go all the way from a 45 to a 52.5 pilot, but the stock pilot is on the way.
It sure doesn't bog anywhere from idle to full throttle. It's a hell of a rush after riding a 250.

Title: Re: Flyin' High
Post by ralfyguy on 03/16/11 at 21:32:41

The rolloff test is actually supposed to show whether the main is too big. Backing off to 7/8 throttle with increasing speed means it's too rich at full throttle.

Title: Re: Flyin' High
Post by HJH on 03/17/11 at 07:52:02

Page 5 of the technical section, Lancer's data on jetting CV carbs:"If the engine gains power as you roll the throttle off, the main jet is too small...". Ergo, I need a larger main.

Title: Re: Flyin' High
Post by thumperclone on 03/17/11 at 08:06:57

fyi
insure engine is completley warmed up when carb tuning