Modifications - Performance Discuss aftermarket and DIY performance modifications

dyno jet

Old 05-11-2010, 06:08 PM
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dyno jet

hi i am planing on changing my exhaust pretty soon , and i keep on hearing that i must jet the carb can sumone give me a explanation why i have this done . also i,ve been look on ebay for a kit . can sumone tell me it this all that consist of a jet kit.

http://cgi.ebay.com/ebaymotors/Honda...Q5fAccessories


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Old 05-11-2010, 07:47 PM
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this forum has both search and spell check functions...
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Old 05-11-2010, 10:07 PM
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The picture on ebay is missing some parts-- the springs and the "D" tool for adjusting the pilot screws. Maybe he just didn't put all the parts in the photo as the kits (9 available) are listed as new.

If you stay with the OEM air filter and get street baffle slipons, you probably don't need to rejet. If you change filter and/or get race baffle cans, you probably do.
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Old 05-12-2010, 05:35 AM
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Originally Posted by RK1 View Post
The picture on ebay is missing some parts-- the springs and the "D" tool for adjusting the pilot screws. Maybe he just didn't put all the parts in the photo as the kits (9 available) are listed as new.

The pic in the Ebay listing is generic. Notice there are 4 needles..........



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Old 05-12-2010, 07:54 AM
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IMHO the Factory Pro 1.0 / 1.1 kit is an easier install than the DynoJet kit, no drilling. I am sure that they both work pretty well. JB
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Old 05-12-2010, 08:16 AM
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Drilling is not an absolute necessity with the DJ kit. In fact, VTR guru Roger Ditchfield of Revolution Racing in the UK recommends against it for road-going VTRs.
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Old 05-12-2010, 08:58 AM
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if you don't drill though you have to use the old springs, if you do you have to use the dyno jet springs. I don't think it really matters, but after trying to put the stock springs back in you might be frustrated enough to try the shorter springs for that reason alone.

As far as the issue on hand no need to rejet just yet, change the exhaust, ride the bike, then if you notice any flat spots or carb back fires (sound like a clack under the tank) then and only then does it require jetting. Unless you are on a quest for those mysterious couple of hp gain. The only way to get that reliably is to jet and dyno tune it for performance which is going to cost some coin. So IMO I say only fix what isn't working right.
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Old 05-12-2010, 10:18 AM
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A high flow air filter will require rejetting more so than a pipe. You may be able to get away with a shim under each needle. Cheap and easy, but you should ride it beofre doing anything to see what might be needed.

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Old 05-12-2010, 08:06 PM
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I just put on devil highmounts and noticed a nifty flat spot in there. Gonna shim the stock needles and do the tps adjustment and see how that works out.
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