So I was riding at top speed at the highest rpm for roughly about 2-3 minutes. Suddently when slowing down the bike died. (The clutch was already pulled in) Then the next time I started the bike, it made this terrible noise and it died on idle. The piston and cylinder was fine, but the plug was extremely black. There was also some very small metal shavings on the piston and the top. I can also now lift the conrod a little up and down. So I think the bearing has seized. Why do you think this happened? Is it bad to run 2 strokes at very high RPMs for extended periods? husqvarna sm 125
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Hi everyone,
As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.
When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.
Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.
Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.
Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.
Thanks for your patience and support!
125-200cc engine seizure
- Thread starter RPMKICK
- Start date
sabortooth
No Class
I never trust an 2t auto-lube. Sooner or later they will crap out and the only way to know is a blown motor.
justintendo
klotz super techniplate junkie
isnt it hard on a two stroke to run it hard for extended time, then close the throttle?
either way it does sound a bit hard on it but it should be able to take it..if your jetting is right i would be pretty suspect of the autolube, especially max rpm, max speed for minutes at a time. its also possible the conrod bearing is highly worn and this event finished it off..rpm is what kills rod bearings. you probably used up what little it had left.
you say you mix 2%, thats probably not enough oil for running a bike like that..
either way it does sound a bit hard on it but it should be able to take it..if your jetting is right i would be pretty suspect of the autolube, especially max rpm, max speed for minutes at a time. its also possible the conrod bearing is highly worn and this event finished it off..rpm is what kills rod bearings. you probably used up what little it had left.
you say you mix 2%, thats probably not enough oil for running a bike like that..
the sm comes with an auto lube pump, but are you saying you don't use the pump and mix only 2% of oil to the petrol mix? That doesn't seem enough somehow, I'd run closer 30 to 1. I think you mean '' I put in 2 Cl's, not dl's. Anyway a supremely black plug means a very rich mixture so that doesn't make sense. Have you still got the top end off the engine? Can you turn the crank around by hand with force or is it completely seized up?