Iv heard alot of guys say to put 420 main jets in my proX 700. How safe are these. I do not want to melt a piston or get stranded somewhere. And these take the standard mikuni hex style jet?
So a gutted air box actually loses air flow on those?420 mains with a gutted airbox is safe at sealevel down to -5 * and you could still WOT for 1/2 mile ,colder then that or stock air box you will want to have 430's if your going to run it WOT on cold days. Gutted air box makes it act one size richer then stock.
I would never tell any one to jet this close unless your capable of reading plugs ,wash and know that you have 91+ fuel in the tank...... your that close on extream cold days![/b]
So a gutted air box actually loses air flow on those?[/b]
This year I am running 420's. seems snappier on a 20F day. Next year 420's with Holzman Varitemp installedi ran 420's on a stock sled with a single pipe and reeds (stock airbox) down to -20... above that I personally believe you can run 410's on a stock motor fairly easily, but you have to pay attention to what your plugs/wash are telling you...[/b]
440 is stock... on a stone stock motor/airbox/pipe sled the best bet is to install 420's and a holtzmann tempaflow... it'll run great in any weather that you'll actually WANT to ride in and be safe...[/b]
imho, with fuel injection coming no-one wanted to botherCan any one explain why that tecnology was not purchased by OEM? Seems Team clutch and PERC have been purchased. Also how close is the Holzman to the first gereration Doo carb that regulates for air temp? Do they both regulate by float bowl pressure/vacuum?[/b]
I dont recall seeing any tech info in magazines on how skidoo designed their carb to adjust for air temps? Maybe I read it was "borrowed" from OMC when Doo bought the division? I bet it is based on Float bowl pressure/vacuum.imho, with fuel injection coming no-one wanted to bother[/b]