Junior
Currently Offline
2008 Roketa MC54B-257 (10,000 Miles) and counting
Posts: 215
A+'s: 1
Joined: Jul 6, 2011 16:47:54 GMT -6
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Post by bhinch on Jul 11, 2011 17:03:25 GMT -6
Great info.....In the aviation world...this is called a differential compression tester.....we use 80 lbs in the cylinder and we are allowed down to 72 lbs (two gauge setup) and still be a good cylinder...lower than 72 lbs the cylinder has to be pulled and rebuilt....like you said air past the rings go into the crankcase (blowby).... noise in the intake... valve not seated properly...past the exhaust valve....you hear it in the exhaust pipe (burnt valve) or not seating properly...a very useful tool...enjoy the ride..
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Junior
Currently Offline
2008 Roketa MC54B-257 (10,000 Miles) and counting
Posts: 215
A+'s: 1
Joined: Jul 6, 2011 16:47:54 GMT -6
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Post by bhinch on Jul 11, 2011 16:49:17 GMT -6
Hi..guys and gals...the valve lash is required because our scoots do not have hydraulic lifters (cam followers) so we have to adjust them to .004 intake and .005 exhaust....this allows the valves to close completely thus giving us cylinder pressure (compression) intake...compression...power...and exhaust ...a 4 stroke engine....when the valves do not close completely we lose compression and on the exhaust valve a burnt valve could result...it is not overnight...but it can happen... the valves rotate everytime they open and close... most of the scooters come from across the pond with the valves too tight...no clearance...so they run bad or do not run at all.... no vaccum no fuel pump....so like JR said....this is a very important procedure to take care of....it shoud be on the PDI to be done first...this solves alot of the problems from the beginning.....enjoy the ride....
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Junior
Currently Offline
2008 Roketa MC54B-257 (10,000 Miles) and counting
Posts: 215
A+'s: 1
Joined: Jul 6, 2011 16:47:54 GMT -6
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Post by bhinch on Jul 6, 2011 17:15:30 GMT -6
Thankyou...Thankyou....so happy your back with us.....been missing your knowledge.....2008 Roketa MC-54B 250 Silver......5400 miles....and lots of smiles....thanks again....
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