Jetting Issues From 240 To 280
Posted 04 May 2012 - 01:45 AM
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Posted 04 May 2012 - 07:47 AM
What is really important is that you increase the size of the main jet . The 280 will have had a larger main jet than the 240.
If you dont do this you run the risk of seizing your piston and wearing your big end bearing.These parts are very expensive, so dont risk it.
It wont make a jot of difference that you are putting the right amount (or more)of two stroke oil in.
Petrol cools the top end of the engine. Less petrol = more heat= seizure.
Its important and the larger jet will give you more top end power.
If you phone the sherco uk importer, Malcom Rathmell, im sure he will remember the jet size. Hes very helpful.
Id be guessing , but the main jet will be about 5 - 10 sizes bigger.They are as cheap as chips on fleabay
Edited by gasgas249uk, 04 May 2012 - 07:49 AM.
Posted 06 May 2012 - 01:05 AM
Posted 06 May 2012 - 03:27 AM
Just because the fan starts and stops normally, that is no reason to think that the motor is jetted correctly throughout the range of throttle positions. The fan responds to coolant temperature, which lags changes in the heat production rate. The thermal inertia of the cylinder and coolant is the cause of the lag. If the lean mixture only cause brief periods of increased heat production, then fan operation will appear normal.
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