could anyone explain the why and any performance difference of reverse jetting cabs. I do not understand the ins an outs of doin it, and as my carbs run well as they are set up ... not broken - don't fix?
because the fuel flow increase in a carb run slightly behind the airflow increase your carb is always playing catch up When you reverse jet it you have a quicker response for the fuel flow due to the larger jets This shows up as a quicker throttle response Also with the larger low speed jets you also get case and cylinder cooling while you are idling around this gives you a big torque hit when you stab the throttle It works even better if you run a alot of advance
Sounds Like wax is the man to talk to about that Have a look on X-h2o, looks like you run a smaller main jet than pilot jet, Sounds like a lot of farking around, If its not broken don't try and fix it I say, Just ride the thing???????? See he beat me to it!
I used to run reverse jetting but ended up reverting back to normal jetting spec's. I know Roge also tried reverse jetting but now runs the normal jetting configuration. I would have thought for a standard motor then as Tim states if it isn't broke why fix
If normal jetting runs fine for you then leave it that way I run reverse jetting on my boats it makes them hit harder
Are there any standard skis??? Only till they leave the showroom. I can see the logic of reverse jetting but where do you start?? May pay to ask any of these guys on x-h2o what they think for a start. Supertune Jr. #.0 Wax Would be worth a go if you have the jets kicking around. let me know how ya get on
Lot's of others have tried this but reverted back to normal jetting. Good luck if you give it a go, it'll be interesting if you notice any gains / benefits from this setup.
current set up: .25 over 760cc. b pipe- mod chamber shaved head (170psi). mild porting. & exhaust twin 44s. msd. alloy lite flywheel. boysen reeds it goes sweet... ...am about to try on novi 46's and just thort I mite check out both ways of jetting when I do...tho mite not too. I got specs for 46s from roger out of his novi book (normal jetting) which is where I'll start. thanks, I'll let you know if I do try it out.
on the 44s i would go with 125 low and 105 hgh with 19 psi as a start on the novis i would start with 130-35 low 110 high and about 22 psi as a start make sure when you fit the novis you run a 60 jet in the return line
...thanx wax, Ive printed those off for future reference. I'll set them up to the book in the first instance. I've put the return jet in each of the carbs at the carb (tapped and screwed in). it's just waiting for the ideal time to muck around with it It's goin so well... won't do anything till after the river run (15th March) cheers for all the info above
you have to use a t piece and put the return jet in there if you use it at the caebs it will be twice as much flow as a 60 on the t due to the fact you have each carb on there own jet Obvioulsy each engine is different so the carb settings i have given you are a starting point this will run and should run quite well but you will need to fine tune it as well
ohhh...thanks for that will change that to a T jet set up. yeah it's a nice set up, reliabilty and a bit grunt. don't want to get so modified it causes me issues. I'm just assuming since 44s are standard on a 760 that t I'll squeeze a bit more with 46's and still not be 'getting out there' as far as mods. I have the wamilton adapters to allow the standard airfilters to be used. (surf riding only) 44s run: 1.5n/s 95 spring 137.5 main 120 pilot standard air filters pop off is around 32
yeah thats std jetting There is alot more torque waiting in those 44 carsb if you set them up in reverse as well
hey Redtro.......i pretty much have exactly the same setup as you ....running exactly the same jetting. I did try reverse jetting. 125 pilot 105 main 2.3 N&S 95 gram spring I didnt really give it a good go tho ........was choppy when i took it out ...then switched back to the convential jetting i knew, because i wanted to go in surf the next weekend. it did seem to be a bit more snappy down low....but seemed to be harder to start and seemed to foul up a bit after riding at low speed and would need a second to clear. but as i said i didnt really give it a decent trail.....only tweaked with the adjusters a little bit but was hard to notice difference as it was choppy.. Havent given it another go yet .....dunno if i will cause it seems to run good with conventional jetting
thanks knoxie. I'm going to set the 46's up conventionally... and mite have a muck around later with reverse jets, kinda similar feeling...there's never enough time when we're riding all the time... & don't want to stop doin that.
You should have played with your adjusters more Reverse jetting is not a dark magic Its just a case of giving the ski the fuel it wants when it wants it
Does any manufacturer have reverse jetting standard ? I thought reverse jetting was more temperamental remembering the differences you guys have in temp and you ride from sea level to the river runs is it really worth it
