mirage cam timing again

merlin said:
... 85 miles to a tankful ...
Click to expand...

Don't worry Dave. When I first got my Jota, it was doing about the same (130 to 140 km per tank). DPO had 135 main jets in it. A dyno run revealed that it was way too rich at WOT and only making about 60 HP at the rear wheel.

120 mains got the air/fuel mixture closer to the mark and gave a marginal increase in RWHP, but didn't make much difference to fuel consumption (bikes don't spend much time at WOT on the road). Balancing the carbs made it a little bit better, but  the big improvement came when I dialled in the 4C cams. Fuel range suddenly jumped to 200 km (130 miles) per tank, and it was making 80 RWHP.

Later on I put a set of Mikuni RS36 carbs on it which didn't make a lot of difference to horsepower, but pushed the fuel range out to about 260 km (160 miles).

Keep fettling. You'll be rewarded in the end.

Cam
 
thanks for all the advice ,the 4c cams were in it when I bought it ,I have been playing with it and doing what breganzane said so hopefully today I can do the final checks and run it .as far as taking it to a specialist I cant think of one very near to cornwall I had thought of that
dave
 
Last time I went down to where 3X used to be they had closed the unit which had the Italian bikes in and basically all I could see were a Triumph dealer and scooter shop. It's a long way from Cornwall too by the way.
 
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