sol
Junior Member
Posts: 18
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Post by sol on May 30, 2007 9:39:20 GMT -5
hello excuse my english i speak a little bit ,,sorry  (Who) know this manx Omar's exhaust.. Quality / prices is't worth the purchase.. And for the jetting.. |
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sol
Junior Member
Posts: 18
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Post by sol on May 31, 2007 2:24:23 GMT -5
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Post by grizld1 on May 31, 2007 8:45:03 GMT -5
Omar's pipes run 1 3/4" ID. For street and most race applications, optimal ID on the XS650 and 750 conversions is 1 3/8" to 1 1/2". The big pipes require some other bits which Mr. Little does not see fit to offer, such as anti-reversion restrictors. They are offered by Michael Morse at www.650central.com. They will increase the cost of the system quite a bit. If you do not know how to test and modify your jetting, I'd advise you to study the matter before you modify your exhaust system. You will need to rejet for any aftermarket system, and if you are using stock CV carburetors, be aware that many versions were produced with many different factory baselines, and that choice of filters and engine modifications also have impacts. The result is that others' jetting choices are not likely to be helpful to you. |
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sol
Junior Member
Posts: 18
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Post by sol on May 31, 2007 16:56:29 GMT -5
y has to you it much modification has to make on my original carburettor if I install this Omar S... Tell me what I owe changed please..Have you picture for exemple
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Post by grizld1 on May 31, 2007 22:20:22 GMT -5
You will need larger main jets and larger pilot jets and you may need to adjust needle position as well. I can't tell you exactly what numbers you'll need; that has to be determined by testing on the individual engine, and your choice of air filters will also have an effect. On a stock engine with those pipes and the full set of 650 Central add-ons, I'd advise you to start by buying pilot jets 1, 2 and 3 steps larger than stock for your carbs, and main jets 2, 3, and 4 steps larger with the stock air box, 3, 4, and 5 larger if you're installing pod filters (do yourself a favor and don't use cheap ones). That's a starting point only--you may have to go larger still on the mains. I've seen similar 1 3/4" pipes (Ascot style) used successfully with stock carbs; the bike was built by a professional.
There is much published literature on carb tuning, and I would encourage you to start with the Mikuni Tuning Manual from Sudco.
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