jetting for scorpion cans

[chaz]

doing a friend a favour, might be buying his bike as he has lost his job.
its a 2002 storm , has scorpion cans and need to check jetting as he is running around 60 miles to the tank.
any idea of which jets as I think they are too big as its exhaust is rich thanks

[thunderbolt]

If only the cans have been altered and no other modifications (i.e. airfilter, K&N etc) then standard jetting should be ok. You will need to pull the carbs and have a look what is in there. Altering the exhaust by itself usually does not require a dynojet kit or different jets. At most up one size on the pilots and mains and then some testing will need to be done to work out needle position.

[chaz]

thanks TB will probably look at over the weekend

[thunderbolt]

First thing is to find out what is in there - what size jets, etc. Especially seeing as the fuel consumption is so bad and then go from there.

[ebenviljoen]

I bought my bike with scorpions and standard jetting. I got a out 85 miles till the red light came on. Since then ive fitted a pipercross filter, dynojet kit, 90mains and 5th clip on the needles, tps set to 500ohms and a flo-commander fitted. my bike pulls like a train, much better than standard and getting 95miles till red light. it took me ages to get correct combinations tho, had my carbs off at least 10 times. hope this helps

[tony.mon]

60 miles to a tank is a bigger problem than just jets- it would have to be using almost twice as much fuel as it should, and wouldn't run at all.
It's not jets.....

Fix the problem first, then rejet if necessary. Get it on a dyno to get a reading of fuel/air mixtures, guessing isn't helpful on most occasions.

Unless it's 60 track day miles, that's about right.

What are the plug colours?