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Originally Posted by polex
I have not disassembled the carbs yet and I prefer to collect information before do it.
If 1.5mm above joint is equivalent at 14.5mm (OEM setting) THEN the 1.5mm below joint should be equivalent at 17.5 mm (FP setting).
Is it correct ?
The Service manual measurement gave me another info: the gas float level is below Factory Pro setting.  |
I've never personally tested the Haynes or FP settings against the Triumph setting so I can't verify whether any of them match up.
The bike must be level side to side, so the Triumph check can't be done on the sidestand. That will introduce an error of 1mm or more in the measurement
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I have no idea about which kind of jet are installed, I have bought a pre-owned bike. For sure, some modification was made, at least the the gas float level was modified.
Before disassembling the carbs, I need some criteria for recognizing the OEM parts. As I understand, I can recognize the OEM needles because they have no notches for tuning.
Is it correct ?
The main jets should have 98 printed on them.
The pilot jets should have 38 printed on them.
Is it correct ?
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The stock Keihin needle has no notches and is stamped N3RF near the head. The jets will have the sizes stamped (38 pilot/ 98 main) on them along with a stylized 'K'.
The Factory Pro needle has notches for adjustment and the FP jets are also stamped with the size, but the size isn't a 100% match for the Keihin jets.
When you remove the pilot jets, examine the bores with a good magnifier and a strong light. The bores should be clean and 'machined' looking. If the bores appear irregular or 'organic' they'll need cleaning.
IF you have an unmodified air filter box then the stock needles and jets are the best setup for the bike.
IF the filter box has been drilled or replaced with individual pod filters then you'll have to go by the 'proven setups' thread to get the bike running properly.
IF the Factory Pro needles and jets have been installed with the unmodified air filter box then you'll want #38 pilot jets and a main jet either #98 or #100.
On all of these setups, about 2-1/2 turns on the idle mixture screws is the consensus setting that everybody seems to be happy with.
You will need to balance the carburetors. That may account for uneven operation at an idle and small throttle settings and may also account for uneven color on the spark plugs.
Once you have clean pilot jets of the right size and the carbs have been balanced, a badly uneven idle or misfiring on one cylinder may be the result of a failed ignition coil. Go over the carbs first since a bike of that age with so few miles will have carb problems.
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Does Sudco sell to private buyer ?
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Yes, and so does Carburetor Parts Warehouse
www.carbparts.com
Jim
