Yet another Jetting question.

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Yet another Jetting question.

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Yet another Jetting question. - 4/7/2006 10:13:29 PM

Trips

Posts: 795
Joined: 3/31/2005
From: Perth (Western Australia)
Status: offline

I have the Yoshi Ignition Advancer, K & N Filer & V & H 4-2-1. Now its time to rejet.

There are a few brands of Jet kit on the market. Is there any difference between the brands?

Also over here in Australia the Jet kits are bloody expensive. Works out to about $145 US! Do I have to buy a "kit" or can I save some $$$ and just the jets seperatly and shim the existing needles?

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RE: Yet another Jetting question. - 4/7/2006 11:52:03 PM

CBR1988

Posts: 198
Joined: 10/25/2005
From: Hants UK, NY USA, NC USA, UAE now
Status: offline

Hey:

Thats what I did on my daily driver, 124 mains and 2 shim washers under the needle, if you buy a kit the factory brand kits

are good, but they all pretty much the same dynojet, k&n, and yosh.

I spent $25.00 total on the jets and washer/shims including postage, but I am cheap, it works and runs fine, but I just drive 80 miles a day

to and from work in nice wx 5x a week, so its all good.

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When In Doubt Do Without

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RE: Yet another Jetting question. - 4/8/2006 1:11:45 PM

R1000

Posts: 1124
Joined: 1/30/2006
From: Sweden
Status: offline

I bought Keihin #125 jets here in Sweden and they costed 100 SEK which is about 15 dollars for all four.

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Post #: 3

RE: Yet another Jetting question. - 4/8/2006 4:05:37 PM

Trips

Posts: 795
Joined: 3/31/2005
From: Perth (Western Australia)
Status: offline

How much did you shim the needles?

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Remember the light at the end of the tunnel may be an oncoming train!

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Post #: 4

RE: Yet another Jetting question. - 4/8/2006 5:34:20 PM

R1000

Posts: 1124
Joined: 1/30/2006
From: Sweden
Status: offline

My bike had adjustable Dyno Jet needles already when I bought it. I raised the needles two steps which I remeber that gave about +3 millimeter lift from the nominal middle grove position. The bike pulled much better in mid range after that, still with stock #122 main jets and stock downpipes but dual aftermarket mufflers. I will go up to #125 main jets when changing the complete exhaust system to a 4-2-1 downpipe and single free flowing muffler. I'll see where the needles need to be placed after sorting out main jets for full power.

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RE: Yet another Jetting question. - 4/8/2006 7:26:34 PM

dad

Posts: 296
Joined: 11/6/2005
From: Pittsburgh Pennsylvania
Status: offline

My bike is stock throughout. Even stock, raising the needles between .015" to .020" will clean up the middle nicely. There was always a little bit of a stumble when accellerating, somewhere around 4500 or so if my memory is correct. I raised the needles .017" by using a #4 SS washer that was .037" thick, replacing the stock washers that were .020". Those might be weird US designations but it's about a 1/8" screw that they fit.

On at least the '90 and '91 models, US 48 states, not sure about California model, the carbs came with a .020" washer on the needles. I visited the hardware store with my calipers and found and then matched a set of washers (the thickness varied all over the place) as described above but if that hadn't worked out, I would have just ordered another set of washers from Honda, the .020" ones, and added them. That was done around 25,000 miles and I'm at 122,000 now. Always ran well and took that slight flat spot out perfectly. Going more than that with stock pipes would have been too much.

< Message edited by dad -- 4/8/2006 7:29:44 PM >

(in reply to R1000)

Post #: 6