Thread: Carb Tuning HELP on Hurricane
09-05-2012, 08:57 AM #1
Carb Tuning HELP on Hurricane
I spent a little time tuning the carbs on the Hurricane yesterday, and got it running better, but not great....
Here is what has been done:
- 40mm carbs w/accel pump
- vforce reeds
- shortened exhaust pipe
- hotseat waterbox
- 87mm nozzle bore
- 12/17 impeller
I am running 62 low, 35 mid, and 140 high jets...
Here are the symptoms:
- started at 1-1/2 turns out on both and it was really blubbery at low end
- turned 1/8 in and got better, but still not an arm jerker by any means
- idle with the hood up and down is different (idle raises with hood down)
- when I let off of the throttle, it is really slow to rev down
I'm thinking I might have an air leak, and/or accel pump with a leaky check valve.
I plan on checking piston wash this week - any thoughts?
09-05-2012, 09:18 AM #2
- Join Date
- Jul 2007
- near Toronto, Canada
Sounds like your throttle cable is binding. On the Hurricane the throttle cable sleeve is very long so there is more internal cable friction.
See if you can force some lubricant down inside the cable sleeve.
09-05-2012, 10:06 AM #3
At this point you know that 1 3/8 out is too rich because it's blubbering.
Turn your adjusters way down to something like 1/2 turn out. Does the ski now die when you punch the throttle? If yes, turn out 1/8 and and keep trying this until you get punch coming off idle. The sweet spot is going to be somewhere between 1/2 and 1 3/8.
09-05-2012, 10:20 AM #4
How did it run with the stock pipe and stock carbs ?
09-05-2012, 10:47 AM #5
I know that is what we typically recommend: get it running well stock and then start playing, but I built this one from a hull and didn't want to be installing and then re-installing.
There was also quite a bit of information concerning similar Hurricane builds.....so I figured I'd give it a shot
09-05-2012, 10:49 AM #6
09-05-2012, 02:48 PM #7
the virage runs 65 lows,35 mids,140 mains,1 1/2 turns out.runs almost perfect like this
09-05-2012, 09:25 PM #8
- Join Date
- Sep 2006
Is there a little bit of free play in your throttle cable when it is in the idle position?
09-08-2012, 11:36 AM #9
- Join Date
- Aug 2006
- Pittsfield, MA
Also check where the cable screws into the throttle block. You can hardly see it with the stock handle bar cover. Mine fell out early in the season.
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