07-06-2011, 03:31 PM #1
School me on Top End Rebuilds & Reeds
I'm looking for some info on these 2 subjects. I have to replace 1 pistons/cylinders each one two different 1995 sl 650's. One starved from oil with compression at 100psi, and the other just keeps stalling with compression at 10psi, but not a meltdown.
What is Honing? Does this require an oversized piston, or oversized rings? Or does it just lightly remove any imperfections allowing the use of stock pistons and rings? What is an average price to have this done per cylinder and what types of places do this?
If the cylinders are bad enough to get them bored out. Do you have to buy bore specific pistons or can you just buy oversized rings? prices?
When does it become necessary to sleeve a piston? prices?
With my 10psi comression check how do i determine what the cause is since the piston has not melted down?
I understand reeds but am not totally sure what the symptoms can be of bad reeds. Would these effect a compression check? Do these need replaced regularly, b/c mine are probably original. It just seems like i have replaced all maintenance items and am wondering if reeds are one of them?
07-06-2011, 04:56 PM #2
The 650/750 engines are notorious for chipped or broken reeds. The cages set very close to the crank and the forces of turbulent air can cause damage. The 780 motors were less prone to this because the 3/8" spacers between the reed cage and engine case moved them away. Removing and inspecting the reeds is probably a good idea.
07-06-2011, 08:26 PM #3
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