I just installed a set of pro circuit pipes on by banshee.
The pipes came with two 280 size jets My question is do i need to go with this size, it seems like a big jump from a stock 200 jet. It has stock everything else but the pipes.Everybody says jetting helps the power alot, but i running the stock jets for now. any help would beappreciated even if your not a motor wiz.

 

After installing a set of pipes I would rejet. From 200 to 280 does seem too big of a jump though. Someone on here should be able to tell you exactly where to start.

 

Please help!!!

 

I have a 96 Banshee with chrome Graydon Proline pipes, FMF turbine core 2 silencers, K & N air filter with UMI adapter, Boyesen pro series reeds, LRD needles in carbs and I have the snorkel removed. I live at 1,838 elevation and I have 290 main jets and 30 pilots in the carbs. Before I went to the LRD needles, I had 230 main jets, the stock 25 pilots and I had the snorkel still on the airbox lid. I had a nice chocolate brown color on the spark plugs and it ran great. If your only mod is the pipes, then I would start with 240 mains and do a WOT plug test and see what kind of color reading you get.

Later, Doug

 

Flattrack, if you have the pipes on and are still running the stock 200 jets you won't be running them for long. Your engine will seize up from being way, way too lean. Do not run those jets with the pipes. At sea level with pipes 280 seems to be the standard jet size for all of the different pipes. This probably assumes that you have an aftermarket filter and maybe an opened up airbox. You MUST put in the 280 (or at least a LOT larger than 200) jets or you WILL ruin your engine. Jets are not an accessory, they are a critical part of tuning.

Also, if you are doing a plug test try to use new plugs to get an accurate reading. Remember, nobody ever ruined their engine from being too rich but being too lean has killed a lot of engines.

 

280 it shall be.