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Three engine siezures ive been through. Ill share the best one. Remembering that and writing this is bringing a grin on my face.
So here it is. I had it on my 1996 model RX135 back in 2007. I bought that second hand. Prior to that i was riding Kinetic Honda Zoom. That was two stroke too. But riding RX was completely different for me. And as i got deeper into it. I decided to go for a ride. And there was the fault of choosing a national highway for two stroke to run on. The stretch i thought ill go to was around 200kms. After exiting the city i reached the laned highway and throttle open a little less than half i was cruising around 50-60kph.
Half an hour i was on that throttle sticking to that constant speed. After a while when my back started to ache on those uncomfortable gruesome seats of RX i started to take a break. I pulled over the bike to a roadside dhabha and the moment i got off pulling the side stand out i saw back a cloud of trail of blue smoke. Not like usual. And i thought which any of you guys may have : "Is it me."
I didnt paid attention and rushed into the dhabha. Had food and time was to get back on bike and.....Yess the kick was locked wouldnt go down. I though might a little more effort would do but it didnt fudged a mm. Guess what yaah it seized. Dhabha guy told me its seized. And tow was the only option to that. I did so. And reached back home got confirmed by the mechanic about the seizure.
He poured engine oil from the top of the cylinder from the spark plug hole to smooth up the glazed scratched cylinder and piston. It worked but temporarily. Engine started sounding a lot. It sounded like metal parts tumbling and revolving inside cylinder. And it rode half a km spitting out huge i mean huge smoke blue smoke.... after that and it permenantly seized. Went through all the after seizure methods. Got it rebored etc etc.
Cause : Constant speed running on two stroke engines for a long time tend to increase exhaust port temperatures high and high. A stage comes when the local area temp goes high above the MP of piston. Thats the point where the rings start to go off and piston too.
Funny i never experinced that on my Kinetic Honda when i rode that was constant throttle for 70-80+kms. Anyways that was one my engine siezures. So constant throttle may cause shit to happen on two strokes. I since then prefer variable throttle operations on two strokes and while in engine run-in period.

my pulsar 150 first seized when all the motul fully syn oil miraculously disappeared, since then its an engine rebuild every 20000 kms approx.

Constant ripping/ extended full choke warming-up of a cold engine can also cause a seize!

Had a seizure once, 7 years back on a 1999 manufactured CD 100. The bike was ill maintained, the piston rings, engine oil sealant(I dont know wots exactly its called) were damaged. Hence the engine oil was draining out,as well as was burned up. Eventually it was completely dried. I was at 60/70 kmph, when the bike made a peculiar sound and came to halt in the middle of the highway. That was damn scary man(I was i my teens). The total damage was around 4K.
One thing, Keep a check on the engine oil level, engine would never seize. If bore pistons replaced before seizure, it would cost around Rs. 2000-3000 else if you are late, many things will get damaged and the cost would be at the other side of 5K.

What about your auto lube pump, was it working?? Or did it happened due to lack of lubrication??

To compensate for that the exhaust port faces air current directly compared to the intake port. So the temperature should be around the same, right?? Correct me if I am wrong.




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Re: When did you motorcyle's engine seize?

I ran my Rx without lubrication pump. I used mist lubrication back then and even today i do so. So that wasnt the issue back then.

And as per heating up of exhaust ports. I think the burnt exhaust gases tend to increase the exhaust port temperature in all engines.As we all know exhaust ports run at higher temperatures than intake. Constant throttle tends to increase it more. What variable throttle operation does is getting on and off the throttle all the time tends to mix the cool incoming mixture with the hot exhaust gases. Thus keeping the exhaust temperatures low and piston.away from melting.

Re: When did you motorcyle's engine seize?

Why every 20,000 kms? Where did the Motul fully synthetic oil disappear from your P150? Came out through silencer? Was there a hole in the engine?

Re: When did you motorcyle's engine seize?

it miraculously disappeared. no exhaust smoke, no nothing.

it happened with a lot of other pulsar riders, pulsars are not friendly with fully synthetic oils, maybe because they are not manufactured with close tolerances or whatever.

every 20,000 kms because, i do not always replace block piston, i sometimes rebore, also, my bike is like 1.35 Lakh kms old so every now and then some internal part gives away, like counter balancer or shaft, clutch plates, 5th gear cog, valves, timing chain etc..

Re: When did you motorcyle's engine seize?

High time you change the bike rather than rebuilding engine every 20,000 kms. I initially thought you wanted to say that you service your bike every 20,000 kms. So which bike are you buying sir?

Re: When did you motorcyle's engine seize?

Well I had my blow out in the year 2008 Pulsar 150(1st gen).kms - 1,20,000 kms(ODO). The reason was I rode the bike in half clutch in knee deep water for almost 2 km. Caput went the clutch plate and the engine started to knock and all sorts of sound started to come and the bike was spitting white smoke. Then I knew the engine is gone. Then changed the bore piston assembly under insurance. I never knew that there is an insurance cover if your bike goes Caput while riding in the rain.

Cheers

Mathews

Re: When did you motorcyle's engine seize?

I am repeating this incident that I had posted on Orkut Community long time back. This happened when P220 - FI was first launched. I was one of the early buyers from Vashi, Navi Mumbai. I got my bike from the first lot that cam to Navi Mumbai. At, the time of delivery I was told "No need of running in Sir. This is a new technology". I took his words literally, and went on a Top Speed Test on my new 220 FI. Did 120, 125 couple of times, and in the last run when I was trying to touch 130 on the Palm Beach Highway, I heard a weird loud noise from the engine. No, the Engine did not seize. I was able to ride it home. Next day morning when I started the bike, same noise prevailed. Took the bike to the service centre. On inspection it was found that the Piston had tilted in the block and was causing the noise. Got a new Piston Block under warranty with a warning to follow running in.

Re: When did you motorcyle's engine seize?

Can you please explain the portion highlighted in bold.

Re: When did you motorcyle's engine seize?

not yet decided, initially wanted CBR250, then i got impressed by Hyo GT250R, now since last few days P200NS is appearing very VFM kind of bike .. just now inazuma appeared, then there are duke's. confused like hell.