Question on Jetting - SV with different size jets

Just pulled the carbs out of a used SV and wanted to check and/or change the jetting. Noticed the carbs had different size main jets. 150 and 152.5 from what I remember.

Anyone ever see this before and/or is there a reason for it other than the guy that jetted it either didn't have two of the same jets or couldn't read the numbers on the jet or pulled them out of the same bin and never looked at them when doing the install.

Also, anyone know the trick jetting for a suporsport SV with a full exhaust?

 

rear cyl runs hotter, thats why the jets are different



JB

 

:up: Yep.

 

is your air filter SS legal.by jet sizes looks like filter is been cut open.

 

The fastest stock 1st gen SV I raced against had 142s in it.That's at Florida sea level.72hp on pump gas.152s sound huge.Is the motor cut?

 

sv

Motor is stock with factory air box and K@N filter. Haven't had her on a dyno yet.

 

Get rid of that K&N.Those bikes run much better with paper filters

 

front/rear cylinder jets different size part makes sense. However, I would think that someone has race gas in that bike or had it in there. Race gas (Nutec or MR1) typically calls for larger jet size. My 1st gen SV makes 74 HP on MSPs dyno with Intake cams in the exhaust and 135 main jets in both carbs, pump gas and the stock filter. If you have an open mouthed K&N I would think about 140- 142.5 for jet size, with needle in the third position.

 

That, and I used Yosh MJN needles. We ran 150/152 also.Using MR1