Reed valves and windowed piston

Sean Clarke

New Member
May 21, 2018
7
0
1
Perth
Im just a kid just mucking around in my garage with a motorised bike. The other day I windowed out my piston (a lot) and now the engine won't start. I have a HP carburettor and a very slightly sanded cylinder head.
I see people talking about reed valves when they mention windowed pistons. What's the relationship between these?
I know I have a spark, my fuel line is fine ect. I know the problem is either with my jet or the piston. Any help as to what I should to?
 

crassius

Well-Known Member
Sep 30, 2012
4,032
155
63
USA
back of piston controls all intake timing in standard motor - when you install reeds, they take over all timing, so one opens back of piston to keep it from interfering with the reed's timing

with no reed, you now have no timing of the intake, so no timing at all until you get a reed (or a new piston)
 
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