lee22 Posted May 25, 2011 Report Share Posted May 25, 2011 Hi folks, I bought a 06 270 rev3 a year ago. Love the bike. I've rode two other beta's of a similar age and mine seems to be a good bit under powered. I want to freshen the engine up and want to know what I'd be best to do. Am thinking of putting a new set of rings on the piston or maybe a complete new piston and rings. Any advice on what would be the best would be great. Lee Quote Link to comment Share on other sites More sharing options...
02-apr Posted May 25, 2011 Report Share Posted May 25, 2011 Hi folks, I bought a 06 270 rev3 a year ago. Love the bike. I've rode two other beta's of a similar age and mine seems to be a good bit under powered. I want to freshen the engine up and want to know what I'd be best to do. Am thinking of putting a new set of rings on the piston or maybe a complete new piston and rings. Any advice on what would be the best would be great. Lee Could be many things but, assuming all settings are correct, go for the cheapest option first and fit a set of crankshaft seals. it should be possible to do these without splitting the cases? Quote Link to comment Share on other sites More sharing options...
lineaway Posted May 26, 2011 Report Share Posted May 26, 2011 Could be your exhaust is plugged up. Quote Link to comment Share on other sites More sharing options...
copemech Posted May 26, 2011 Report Share Posted May 26, 2011 Ignition timing may be set back a bit by previous owner as well? Quote Link to comment Share on other sites More sharing options...
dombush Posted May 26, 2011 Report Share Posted May 26, 2011 Hi has the engine been deliberatly "softened" by a previous owner. A list of possibles including some previous suggestions. Low compression:- --try a compression test ----someone fitted a head spacer (should be visible) ----someone fitted extra base gaskets ----Rings worn out (measure the ring end gap) ----scored or worn cylinder Other stuff --someone fitted a inlet tract spacer in front of the reed block --retarded ignition --Need to repack the exhaust (is it louder than others) --Bad jetting (does it smoke, not rev out or hesitate) --clogged air filter --crankshaft seals (irratic tickover, or smoking engine, or oil in the flywheel area) --Damaged reed petals (hard to start) regards Dom Quote Link to comment Share on other sites More sharing options...
lee22 Posted May 26, 2011 Author Report Share Posted May 26, 2011 Thanks for all the replys. I've done most of the obvious things like repacked the exhaust and cleaned the filter. Don't think it anything like reeds or gaskets cause the bike goes ok just seems to be down on power. Ask the previous owner to see if he had done anything but hadn't. Think I might take the barrel off at the weekend and have a look at the cylinder and piston. What's the best way to do this apart from takin the whole engine out? Thanks again for the help. Quote Link to comment Share on other sites More sharing options...
stork955 Posted May 26, 2011 Report Share Posted May 26, 2011 Gday, have you cleaned the front parts of the exhaust? If not, do this first before stripping it. There are many threads on how to do this in the beta forum here. Afterwards, check compression - dont strip it just yet until you have eliminated all the easy stuff! Cheers, Stork Quote Link to comment Share on other sites More sharing options...
lee22 Posted May 27, 2011 Author Report Share Posted May 27, 2011 Gday, have you cleaned the front parts of the exhaust? If not, do this first before stripping it. There are many threads on how to do this in the beta forum here. Afterwards, check compression - dont strip it just yet until you have eliminated all the easy stuff! Cheers, Stork Thanks no havent cleaned the front part. I`ll take it off tonight and have a check. Quote Link to comment Share on other sites More sharing options...
dan williams Posted May 27, 2011 Report Share Posted May 27, 2011 Also check to see if your friends have the white "fast" throttle tube and you have the "slow" black throttle tube. I find after 4 years of constant riding a set of rings restores the power quite nicely. New piston isn't needed unless you pull the cylinder and find visible damage. Quote Link to comment Share on other sites More sharing options...
02-apr Posted May 28, 2011 Report Share Posted May 28, 2011 Thanks no havent cleaned the front part. I`ll take it off tonight and have a check. Have a quick look in the port while you have the pipe off. You may see any damage. Quote Link to comment Share on other sites More sharing options...
mcman56 Posted September 6, 2011 Report Share Posted September 6, 2011 Hi has the engine been deliberatly "softened" by a previous owner. A list of possibles including some previous suggestions. Low compression:- --try a compression test ----someone fitted a head spacer (should be visible) ----someone fitted extra base gaskets ----Rings worn out (measure the ring end gap) ----scored or worn cylinder Other stuff --someone fitted a inlet tract spacer in front of the reed block --retarded ignition --Need to repack the exhaust (is it louder than others) --Bad jetting (does it smoke, not rev out or hesitate) --clogged air filter --crankshaft seals (irratic tickover, or smoking engine, or oil in the flywheel area) --Damaged reed petals (hard to start) regards Dom Where can I find a specification for ring end gap for a 250? In particular, what is the service limit? I assume, a minimum gap would be about 0.015". 0.050 would exceed the service limit but what about 0.030"? Quote Link to comment Share on other sites More sharing options...
liviob Posted September 6, 2011 Report Share Posted September 6, 2011 The ring end gap for my Scorpa sy250 was .0012-.0014. I would think the Beta 250 would be similar. Quote Link to comment Share on other sites More sharing options...
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