has anyone Bored out a 85 honda spree?
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eddeblecourt
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- Joined: Sat Aug 09, 2008 6:08 pm
- Location: Grand Rapids MI
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has anyone Bored out a 85 honda spree?
My cilinder is jacked and the only way to fix it is to bore it out 2 over. Has anyone done this before? Where would i find a piston? My local dealer said honda is out of stock. would i also have to rejet the carb?
I just bored one to 3mm over. Found the piston on ebay. A 2mm piston is also available. Are you sure you need to bore it that far? Or is it the second overbore? That would be .5mm or .020". There is a Honda .5mm piston from another bike that works. The differance seems to be that it has a wider top ring so you need to make sure and get the correct rings.
The .5 piston is:
13103-GS7-305
The rings are:
13013-GS7-305
Once you have the cylinder off to do the rebore is the time to do a little exhaust port work. Raising the exhaust port about a rings width and opening it up between the port and the exhaust flange works wonders. I understand some bike shops will do this for a very reasonable cost.
If you burned up the cylinder you quite likely needed to rejet before. With a fresh cylinder you want to run it a little rich for a while to get it broken in.
keithw
The .5 piston is:
13103-GS7-305
The rings are:
13013-GS7-305
Once you have the cylinder off to do the rebore is the time to do a little exhaust port work. Raising the exhaust port about a rings width and opening it up between the port and the exhaust flange works wonders. I understand some bike shops will do this for a very reasonable cost.
If you burned up the cylinder you quite likely needed to rejet before. With a fresh cylinder you want to run it a little rich for a while to get it broken in.
keithw
Honda Pal (Speed-o-scooter) JDM Spree with varator trans.
Honda Spree, 1985.
Another Honda Pal
Let's give it a try, how hard could it be?
Honda Spree, 1985.
Another Honda Pal
Let's give it a try, how hard could it be?
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eddeblecourt
- Noob
- Posts: 3
- Joined: Sat Aug 09, 2008 6:08 pm
- Location: Grand Rapids MI
- Contact:
Sounds like you need to start boring and see where it cleans up. Two mm over would be a 43mm piston.
The limit to how fast is goes is how fast the engine turns around. Mine pulled 11,000+ before boring and I don't expect it to go any higher and stay in one piece. With the overbore and porting the cylinder I hope to pick up some power so I can fiddle with the drive ratio and raise the speed.
A really handy tool for doing performance stuff is a clip on tachometer. The one I have can either clip over the spark plug wire or the wire going to the ignition coil. I made an extension for the coil low tension wire and velcroed the tach up by the speedo. The approach so far has been to derestrict till I got the engine to turn 11,000 then raise the drive ratio to push the speed up and the engine speed down.
I'm still breaking in the new piston so I haven't wound it up all the way yet.
keithw
The limit to how fast is goes is how fast the engine turns around. Mine pulled 11,000+ before boring and I don't expect it to go any higher and stay in one piece. With the overbore and porting the cylinder I hope to pick up some power so I can fiddle with the drive ratio and raise the speed.
A really handy tool for doing performance stuff is a clip on tachometer. The one I have can either clip over the spark plug wire or the wire going to the ignition coil. I made an extension for the coil low tension wire and velcroed the tach up by the speedo. The approach so far has been to derestrict till I got the engine to turn 11,000 then raise the drive ratio to push the speed up and the engine speed down.
I'm still breaking in the new piston so I haven't wound it up all the way yet.
keithw
Honda Pal (Speed-o-scooter) JDM Spree with varator trans.
Honda Spree, 1985.
Another Honda Pal
Let's give it a try, how hard could it be?
Honda Spree, 1985.
Another Honda Pal
Let's give it a try, how hard could it be?