Staggering Main Jets ...

**Sun Mar 11, 2007 4:02 pm » Post: #1 » Download Post**

Hi all,

Was wondering if any of the NSR track/Race bikes on this forum has or is staggering their main jets. I remember reading a post a while back in regards to the rear cyl getting hotter than front cyl and something to the effect of compensating to help cool down rear cyl a bit, they would go up up a step on the MJ, i.e. 160 fr / 162 rr . I know some of the TZ/RS's do this as standard. Thanks for the replies!

Randy
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**Sun Mar 11, 2007 4:26 pm » Post: #2 » Download Post**

1 or 2 size stagger is common, but not cast in stone.

Whatever the cylinder needs... Smile

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Andy.
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**Sun Mar 11, 2007 5:04 pm » Post: #3 » Download Post**

What he said. Jet each cylinder as a seperate engine really.
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**Sun Mar 11, 2007 5:20 pm » Post: #4 » Download Post**

Thanks for the feedback!

I know I know, its off to jet I go...lol

Randy
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**Sun Mar 11, 2007 5:52 pm » Post: #5 » Download Post**

I needed a 1.5 difference last summer and had to run different needle positions to get it right.

Hell, that didn't half zip when I got caught off guard one afternoon when the cold fog rolled in!! Laughing

It's backed off just a tad now.
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Andy.
NSR-WORLD.COM

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**Sun Mar 11, 2007 7:08 pm » Post: #6 » Download Post**

Most NSR's will use odd jets so its not something I would worry about.

Personaly "quote Fontyyy" Steve, you've run big enough jets to power a space shuttle! Ive also run jets small than stock so just jet to what it needs not what someone tell you his needed and you might be ok lol.
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**Mon Mar 12, 2007 2:05 am » Post: #7 » Download Post**

Dave was spot on when he said jet each cylinder as a single engine, as that really what they are. This is true for all bike, 2 and 4 stroke.

I've seen three sizes different on various bikes.

With the NSR there's obvious differences between #1 & #2 cylinders so there's no reason why they should be the same.