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jetting change

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  #1  
Old 04-07-2009
indy400
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Default jetting change

If a two cylender sled was bored out 10 thousands, would the carbs need to be rejetted.
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Old 04-07-2009
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Not really from stock.
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Old 04-07-2009
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Only 10 thou, I would say no but you really need to be careful that you have the stock size jets still in the carbs and the carbs are spotless.
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Old 04-19-2009
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^^^ Agreed.

To be safe though, I'd check my plugs and wash a few times early on to see exactly how it's burning and different RPM ranges.
It could possibly need a touch more fuel up on top.
It will be a very small difference though, and probably not enough to worry about as long as you are with in good parameters now for variences in your elevation and ambient temps.
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Old 03-09-2010
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The factory setting for my sled is Main jet-230 Pilot jet 40
The jet needle at the 3rd clip. and is set -20 to +10

Does this mean if its -25 or + 20 and I ride i will damage my motor?
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Old 03-09-2010
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Quote:
Originally Posted by indy400 View Post
If a two cylender sled was bored out 10 thousands, would the carbs need to be rejetted.
I would jump it up two sizes on the mains and see how the plugs look. My theory is run rich then step down. Better safe than SORRY.
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Old 03-09-2010
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Quote:
Originally Posted by tb7108 View Post
The factory setting for my sled is Main jet-230 Pilot jet 40
The jet needle at the 3rd clip. and is set -20 to +10

Does this mean if its -25 or + 20 and I ride i will damage my motor?

Usually factory jetting is on the rich side so you'll always be safe from a lean burn down. If you're too rich, you'll just smoke and foul plugs. You won't burn down. Taking that into consideration, if you're over 20 degrees with the factory jetting, you will be getting too rich, but you won't damage your engine (except for fouling plugs.) When it gets colder, you will run leaner, and that's where engine damage can occur. I wouldn't worry about running the sled when it's 5 degrees colder than the factory jetting is set for, but that's just me. Some people run their sleds rich with the rationale that it's better to be safe than sorry.

Do a search on the site about reading spark plugs and piston wash. If your plugs are black, you can safely go to smaller main jets. If your plugs are cardboard brown, you are perfect.
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