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Nice day, if it doesn't rain...
'05 ST1300
'83 502/502 Monte Carlo for sale/trade -
Folks have reported that the "big bore" pistons give a lower compression ratio then stock pistons, I suspect that these are the same wiseco blank in a smaller diameter, giving lower then stock compression which is good for forced induction.1979 xs1100 Special -
Stock air box/K&N Filter, MAC 4-2 exhaust, Bad-Boy Air horn, TC fuse box, Windshield, Soft bags, Vetter Fairing, Blinkers->Run/Turn/Brake Lights, Headlight Modulator, hard wire GPS power
Short Stack - 1981 xs1100 Standard - lowered for SWMBO.
My Bike:Originally posted by fredintoon
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Depends on which year of bike you're talking about. The '78 & '79 have a low-domed piston and smaller valve space in the head. the '80+ have a higher domed piston and bigger volume space in the valve area (Larger valves). The aftermarket "Big Bore" pistons are domed somewhere in between these two, so on the earlier models, it'll bump up your compression and the 80+ bikes would drop it compared to one that would have had a similar dome. That being said, if you are going with the bore kit, you're motor is probably wore out with low compression, so a new piston/rings/hone is going to greatly increase the compression you had.. no matter the year.Folks have reported that the "big bore" pistons give a lower compression ratio then stock pistons
TodTry your hardest to be the kind of person your dog thinks you are.
You can live to be 100, as long as you give up everything that would make you want to live to be 100!
Current bikes:
'06 Suzuki DR650
*'82 XJ1100 with the 1179 kit. "Mad Maxim"
'82 XJ1100 Completely stock fixer-upper
'82 XJ1100 Bagger fixer-upper
'82 XJ1100 Motor/frame and lots of boxes of parts
'82 XJ1100 Parts bike
'81 XS1100 Special
'81 YZ250
'80 XS850 Special
'80 XR100
*Crashed/Totalled, still ownComment
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