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staggered jetting?


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motulman

 
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staggered jetting?

Sun Dec 18, 2005 8:45 am » Post: #1 » Download Post

hello everyone educate me, on these bikes mc16/18 or all nsr's in general do ya run different jetting in each carb? and if so why in a previouse post regarding spark plugs so they mentioned running a cooler plug in the hotter cyl does the same apply here but i dont get why you would need to run one side richer because of heat on a water cooled engine? heat is the only reason i can think of to run staggered jetting and the only reason i ask about staggered jetting is because on the bike i just bought i was checking it out like i do with all 2 strokes i buy and found different jetting in the back cyl as opposed to the front cyl, it had a different main jet and a different pilot jet so...i asked some of our 2 stoke nutz here and some said that they thought it ran a staggered jet setup but the pilots should be the same only the main jet should be staggered...thanks all sorry if i ramble alittle Very Happy
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Matt@TYGA
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Mon Dec 19, 2005 6:14 am » Post: #2 » Download Post

There's no reason why the #1 and #2 cylinders should run the same jetting.

Consider the engine as two 125cc engines as that's what it is. It's two engines linked to a common gearbox.

Unlike most parallel 250cc twins, the NSR (and other V2 engines) do not share the same basic engine configuration between the #1 and #2 cylinders. The crankcases are different in shape and volume and the combustion chambers are different thanks to spark plug offset.

So, apart from running at different temperatures can you now see why they will run different jetting?
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Dave Ett
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Mon Dec 19, 2005 8:53 am » Post: #3 » Download Post

Not to mention the fact 'staggered jetting' sounds cool... Wink
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Matt@TYGA
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Mon Dec 19, 2005 9:22 am » Post: #4 » Download Post

Dave's got it Very Happy
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