Removing Air Box Cover to Derestrict GS550

[curtie94]

I was googling about the gs550 and came across a post saying if you remove the air box cover but leave the filter in. And re jet to 120 main jets and one size up on pilots you will gain more power.

Is this true or is it just making power delivery more abrupt?

I only ask because I have some 120 mains that I could try.

What's your input.

[Nessism]

Removing the airbox lid will allow more air in, but doubt you will have to go up more than one or two main sizes. Pilot circuit might not need anything other than tweaking the screws.

[curtie94]

would it give me a performance gain on the stock setup? I will do it if It will be noticeable.

[curtie94]

Here is the post i saw.

http://www.caferacer.net/forum/project-builds/16794-gs550-performance.html

"I'll tell you exactly what will do it:

Remove airbox lid (leave in filter)

Main jets to 112.5 to 120's, depending on location.

One size up on idle circuit jet. Maybe two, but doubtful.

That's it. That's all it takes.

The gains for doing this on the GS550 are absurd. No other bike I've ****ed with has the same kinds of returns with a simple slight derestriction and jetting change.


(The above is for the 80 and later gs550's with CV carbs. I haven't done the earlier ones, nor ridden one, with regular slide piston carbs. The earlier ones may not respond as well. Head is a bit different, mainly on intake tract dimensions.)"

[Nessism]

You may notice the difference, but it will be slight if you do.