If you’ve changed to a slip on muffler and/or changed the air filter on your Translap, you will probably have to re-jet the carburetors, changing the jets to bigger ones. A muffler with less resistance and air filter that allow a greater air flow will disturb the air / fuel mix, crucial for effective combustion. One of the symptoms of a too lean mix is exhaust bangs when you release throttles. Another is white spark plugs.
The solution is to re-jet the carbs. You can buy jets for about 4-8 Eur at your local motorcycle dealer. There is no standard setup so you will have to buy several different sizes and try them out.
Original setup for Honda Transalp XL600V (Keihin CV 34 carburetors):
|Year||Main jet||Pilot jet||Pilot screw setting|
|1987-1988||Front cyl: 128 / Rear cyl: 130||38||2½ laps out|
|1989-1993||Front cyl: 128 / Rear cyl: 130||38||2¼ laps out|
|1994-1995||Front cyl: 128 / Rear cyl: 130||38||1¾ laps out|
|1996||Front cyl: 118 / Rear cyl: 120||38||1¾ laps out|
|1997-1999||Front cyl: 115 / Rear cyl: 118||38||2¼ laps out|
How to do it:
Time it takes: 10-15 minutes per carburetor after you have detached them.
Tools needed: One tall and one short (90 mm) Phillips screwdriver size PH2. One flat-blade screwdriver size 2 or 2,5.
- Follow this guide to detach the carburetors. You only have to detach the carbs from the intakes – all wires can stay in their places.
- Turn the carburetors so you can reach to unscrew the floater house on one of the carbs. Note that quite lot of petrol will be in the bowl and it will be difficult to stop it from running all over the place.
- Make sure you have a flat-blade screwdriver in exactly the right size, or you will damage the slot of the brass jet.
- Screw in the new jet – don’t tighten it too hard!
- Unscrew the pilot jet sitting a bit in front of the main jet:
- Screw in the new pilot jet – note that it is tougher towards the bottom, that is normal, but be attentive when you reach the bottom so you don’t tighten it too hard.
- Put back the bottom of the floater house and turn the carburetors to the other side so you can reach to do the same procedure on the other carburetor.