carb vacuum slide

Number of posts : 28 Registration date : 2009-04-23

I read where cutting a inch off the vacuum slide spring helped acceleration, how does that help and has anyone tried it? Thanks

Subject: Re: carb vacuum slide Tue Oct 13, 2009 5:15 pm

Dont do this unless you want to be looking for another carb spring.

Subject: Re: carb vacuum slide Tue Oct 13, 2009 5:49 pm

mudandguts said he did this to his 450. I haven't tried it.

Number of posts : 28 Registration date : 2009-04-23

Well go out and cut yours and let me know

Subject: Re: carb vacuum slide Tue Oct 13, 2009 7:06 pm

Get a Dyno-Jet kit ,it comes with a less-resistant spring. I would not cut the stock spring.

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Subject: Re: carb vacuum slide Tue Oct 13, 2009 9:52 pm

I cut the stock spring and ran it for a while it worked fine for me and many others. It allows the carb to open up quicker and accelerate slightly faster. I got the dyno-jet kit and run that spring now which is about the same in tension and size as the stocker cut.

Number of posts : 28 Registration date : 2009-04-23

Thanks

Subject: Re: carb vacuum slide Sat Oct 17, 2009 10:33 am

Cutting this spring is something I have done a lot of research on (before cutting my own) I was skeptical at first but after talking with several racers and engine builders who use this trick I decided to try it myself. I ordered an extra spring from Yamaha the first time I did it just in case (they are cheap just a couple bucks).
It would get real expensive for an engine builder to order a jet kit for each bike they work on when instead of buying a dyno-jet jet kit they keep mikuni jets and shims in the shop for jetting and shimming the needle and cut the spring instead of paying 50$ for one that does the same thing.

Number of posts : 28 Registration date : 2009-04-23

I cut 3/4 off mine yesterday very happy and no flutter at wot

Number of posts : 28 Registration date : 2009-04-23

I cut 3/4 of a inch off

Subject: Re: carb vacuum slide Sat Oct 17, 2009 1:17 pm

easttnrhino wrote:: I cut 3/4 off mine yesterday very happy and no flutter at wot

How do you feel the engine response is from this Mod?

Number of posts : 28 Registration date : 2009-04-23

The throttle respone is quicker but I would only say a small amount but price of the mod is good