Thread: Piston Wash Question SL750
04-11-2010, 02:05 PM #1
Piston Wash Question SL750
I have been reading a lot on the piston wash subject and I am ready to tackle the tuning soon,
(1)-Is it mainly the low speed jets or the high speed jets that change most of the wash? or a combinaton of both?
I had a problem bogging down last summer and thru the forums we beleived that the low jets were lean, and the wash was showing a little lean,
I bumped the low jets up a 1/4 turn from the stock setting, already because of the TDR water box, Vortex flame arrestors and tripple fuel pump.
But I haven't run the ski since last year, in the next couple of weeks I want to try and get the wash a little better.
(2)- Any suggestions?
04-11-2010, 05:16 PM #2
the lows only influence under 3000 rpm, after that you are on the high circuit. If you do a lot of high speed runs and check your wash, lows will do nothing for you. you need to adjust lows for the hole shot, highs with the wash.
If you are starving your ski on the lows, the ski will jump out of the hole and then fall on its face as it runs out of fuel, before pop-off and the highs kick in.
If you are rich low, the engine will smoke a lot and when you hit it, it will drag out of the hole with a blubbering shutter.
If you are lean high--you will perform great-until you melt down--piston will be black and dry
If you are rich high, it will run well, but high RPMs will be 300+ lower than correct.--Cylinders will have black center and silver/golden spots around the edges, almost to the center
If you are right on highs you will have fingernail size silver spots at the ports and center will be black and wet
It is not easy, I am still trying to get mine right hey 1 out of 3 aint bad
04-11-2010, 05:21 PM #3
Best way to tell if you are Lean is if you give a little choke, it will get better. If you are not Lean, chike will show no change or it will get worse
04-11-2010, 06:55 PM #4
Thanks, it seemed lean, it would die out and fall flat on its face,
04-11-2010, 07:37 PM #5
If the lows are lean, you can choke through or flutter the gas until you get moving. Do you have a good top end? What are your max RPM ? Top dream-o-meter speed, etc?
04-11-2010, 10:31 PM #6
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