talked to les. i think i have a handle on it.

Hi Greg -

Very good - it's usually better straight from the horses mouth...

I sent you a PM relative to your sponsorship of the site here. Thanks Again!

Jeff
Webmaster
GasGas Riders Club

cool thanks !


les' recomendation was to go way rich on the pilot i'm at 48 now and it pulls clean from the bottom..

he also said 38mm (stock) carb is just way too big for the 200's, which contributes to the idle problems.. - i may swich to a 36 if if i can find one cheap..

the solutions (or so it seems..)

switched to 36mm carb.
previous settings (38mm carb)
178/48/2.5 turns/#3 pos on ddk needle/#7 slide.

now (36mm carb)
172/42/1.5/#2 pos on ddk needle/#5 slide

i started at 178/48 and worked down in jet sizes until the plug color is right.

bike pulls hard and now it truly IDLES! i'm gonna put a couple hours on it today and then race it on sunday and see if all carb problems are fixed :)

Curious if the air box boot & the fitting between the carb & the reed valve all match up ? You had said you thought the 36 was a little shorter.

sudco specs and keihin's website don't jibe spec wise. but they are identical in size. after riding for 2.5 hours, it never stalled except for operator error :) - i am gonna go 1 bigger on the pilot jet and turn the airscrew out a bit..

Thanks for this thread!
I have a 36mm carb that I couldn't get jetted on my 200. I shall try again. :)
Never been happy with the 38mm it seems to overwhelm the engine unless it's screaming.

edited:

now (36mm carb)
172/45/2.5 turns/#2 pos on ddk needle/#5 slide

i had to go up a pilot size, as it was not starting first kick warm unless i was cracking throttle open. it now starts first kick warm or cold, with throttle at any position (i start wot usually..)

45 pilot makes plug a little dark, but i've found that you need to be slightly rich on pilot on these motors to make real world hp/more grunt. keep in mind, i have this motor advanced about 2 degrees - so richer helps keep motor slightly cooler...

still not 100% happy with it.... it's close though.. it does idle though...45 pilot/2.5 turns is loading up plug a bit. 172 main is not burning clean at first - it gets to almost full rev and sputters exactly like a bike with a points gap issue (breaking up at top)....but a 'second' wot cleans it out and it revs to the top. still need to make some changes. suggestions??

now (36mm carb) 90 degrees Fahrenheit
178/45/1 turns/#3 pos on ddk needle/#5 slide

is very close - starts easily hot and cold, idles nice, pulls strong. slight adjustments of airscrew is all that's left i believe.. plug is dark, but richer is better...