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96' Mach Z

815 Views 4 Replies 2 Participants Last post by  91mx
I was out riding this weekend. I took my Mach z out on the lake and opend it up..a couple of questions..
1. There was about 1 and half foot of snow and it seems that my machine was topping out at 80-90km.!!! Thats pretty this normal for these conditions?
2. When getting to this speed my thumb throttle was just a little over 3/4 before being full. I found as soon as I pinned it all the way it would make the engine "bogg" down, also there were a few back fires at these speeds...
Could this mean its missfiring??
Also the person I bought the sled from said he put a "boost bottle"?? He said it keeps the gas distribution in the carbureators even so you dont have to fiddle with the jetting??
When driving it from a start the power band is there, when it hooks up it will pick the front end up 3 feet in the air and take off like a rocket...but it seems at the higher speeds is where it starts acting up?
Any suggestions??
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Any snowmobile mechanics out there or what????
I'm not an expert but it sounds to me like it's running rich on the top end, how are your plugs. If they look like they are fouling then try going a size down on the main jet, but again I'm no expert.

Forgot about the "boost bottle"....try finding out what the stock jet sizes are for that sled and change them back to that and take boost bottle off to change it back to stock.
What is a boost bottle??
And why should I take it off?? No good??
not entirerly sure what a boost bottle is but it probably replaces the stock air box. I would try taking it off and returning it to stock settings to see if it still bogs. If it does then that wasn't the problem, if it runs good then you know what the problem was.

If you don't want to return it to stock then like I said check your spark plugs. If they look like they are fouling from running rich then try going down a jet size in each carb until the sled runs right just be carefull not to go too low and run it lean. You should be alright with one or two jet sizes though.
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