Welcome to NZ Cylinders | Aprilia, Ducati,Honda, Husqvarna, Kawasaki,KTM, Maxter,Suzuki, Yamaha, Porche, Polaris, SeaDoo, TM |
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Suzuki RM250 ring catches in inlet window when fitting cylinder; also applies to some other engines. Ring end opens into port when installing cylinder; use a suitable tool to guide ring into cylinder. Do not force cylinder as this can damage plating/ring/piston.
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If used in Karts they generally require more piston clearance also earlier cylinders with auxillary exhaust ports may sieze on the bridge between these ports. Remedies that have been tried are 1:- polish a little extra clearance into the bore at this point. 2:- file a little more cam profile onto the piston at this point |
Aprilia RS250
Piston seizure, especially on front cylinder. Perform the usual checks:- jets block or incorrect size, ignition timing, old fuel or incorrect octane rating. We have also noted the following:- heads machined (compression too high), muffler blocked, stingers modified (too small), oil system not bleed, blocked radiator. Also watch for:- fuel tank vent blocked (mixture go lean after a distance depending on speed and how full the tank is), oil tank cap replaced with a cork (Chernobyl come to mind) crankshaft seals (see KTM200) Suzuki RG150 use a one way valve in the oil line, I don't know if the RGV250 or RS250 use these, if you can confirm please let me know. |
Suzuki RG150
| Following rebores by several different companies, every one resulting in an exhaust side seizure even with far too much clearance, a replacement cylinder was bought to us for a rebore. When the engine was reassembled it was noted the the exhaust bridge oil injection fitting on the replacement cylinder contained a one way valve. Problem solved. |
KTM 200
A used bike was traded with a seized cylinder, a new cylinder was fitted and it was sold, after a few hours it seized. It was returned to the dealer, another new cylinder was fitted. There is a pattern here, after some more checking a small air leak at one of the crank seals was found, another replated cylinder was fitted. It has now given several years service without a problem. |
