30-04-17, 08:01 AM
(29-04-17, 11:35 PM)tommyardin link Wrote: [quote author=red98 link=topic=22006.msg254574#msg254574 date=1488783340]
Another one for valve clearences :thumbup ....re-grinding the valves would help your compression figures aswell....
had my X7 rebored a couple of yeasr ago...£50 per cylinder + new oversized pistons and rings , dont think thats your problem though .....
tommy , showing your age there buddy :lol ..those old bikes would have been "overhead valve" engines , valves operated by a push rod from the cam located close to the crank , these new fangled motor cycles have the cam on the top and driven by a chain...called "overhead cam" engines.....still important to check valve clearences on the fazers after head removal....
Are not all modern motor cycle engines overhead valve? the really old motorcycles like my original BSA M21 was Side Valve, the BSA Super Rocket (1961) was Overhead Valve with under slung cam shaft running push rods .
tommy , interesting thought that , yes , all modern bikes are OHV.......two basic types of internal combustion engines refered to as...overhead valve and overhead cam...OHV , OHC.... but as you have just spotted they are both OHV engines with exception of the side valve engine , these engines have the valve upsidedown within the block alongside the cylinder bore , so no moving parts in the head just the spark plugs and for any harley fans
:eek known as " flat head " think all engines are now OHC but could be wrong........OHV , OHC are a bit misleading when you think of it like that , all to do with the positioning of the cam , OHV engines have the cam at the bottom of the engine driven usually by a chain and using pushrods , as you mention , to link to the valves , instead of the cam chain on OHC engines......old terms to describe the two different engines which are years old but a bit misleading.......well spotted tommy
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One, is never going to be enough.....