Seizure, sorted... (i think)

[Chiz]

Problem: Derestrited my NSR today (upped jets as recommended, drilled out exhaust restrictor (what a b*tch that is) and took out the plate in the intake. Started her up, fine. Took her for a spin - loads of white smoke, so i waited for it to warm up some more and then gave it some stick. It blummin' flew until about 3 miles away from home when it sounded like it had run out of petrol (revs dying slowly) then the back locked up! I pulled in the clutch and tried starting her again - the engine wasn't turning over after pushing it home me and my team of mechanics (my dad and my mate) examined the carb, unfortunately someone had forgotten to reconnect the oil hose to the carb.

Fix: Took head off and unseized it, plenty of oil and some force did the trick. Reconnected the carb (with oil hose) etc and started her up. She ran fine so i took her for a spin, got to my mates house (about 1 1/4 miles away)

Problem: Pulled up, lots of white smoke, only just ticking over so i turned it off expecting another long walk home. Left the bike for 5 mins and then started her up, didn't sound very healthy (just rough, nothing in particular) turned it off, switched the fuel tap onto reserve, left another 5 mins, started her up (sounded fine) and rode home. Still quite a lot of white smoke coming out.

Question: Is the smoke just the NSR clearing its throat of 6 years of restriction + bigger jets or something more serious?
Will it still run fine after a seizure (even a small one)?

Thanks a lot.

[Richard1987]

a bike will run after a seize, but it depends on the piston / barrels condition, a bike will run with a scored barrel but it will have lost a fair bit of compression

My old derbi senda used to run with plenty of white smoke with the engine running hot or cold but never affected performance or got worse?
I used some of that special oil that reduces smoke and it did work quite well but didnt really bother me personally?
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[Chiz]

The barrels not scored, there was a (i think) small bit of piston stuck to the barrel but i used a emery cloth to get rid of it, smooth as a babys behind now. Also, i don't have any power to compare it to, its faster than it was restricted but ??? as to derestricted.

[SteWhit]

You could have damaged the rings during the seize, it would have been better to replace and the piston when you had the head off. White smoke is usually caused by excess 2T oil being burn, try adjusting the oil pump and see if that makes any difference. You need to be carefull tho as you run the risk of starving it of oil if you adjust it too much. I would have a look in the manual and set the pump to the de fault settings. personally i wouldn't be starting it or trying to ride until i had replaced the rings and or the piston to stop any further damage being done to the barrel.
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[Chiz]

Took her out for a test ride this morning and everything seemed ok. I've done 100 miles today and it seems fine so hopefully it should be okay.

[bish777]

id budget for a new barrel and piston+rings etc. Its astroker so it should be pretty easy.
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[alains]

i suggest you stop using it until a top engine rebuiding . then when you will take the barrel off , inspect it precautionly and if you see marks on it go for a barrel-piston kit + the rings. if your barrel is immaculate , look under the exhaust port the letter marked on it and order piston kit . remember :
- rings are not include in kits
- you need cyl. head gasket , base cyl. seal , valves seal dust , piston pin , small end bearing , clips (2)
- ask if order piston kit what is include with it
your best dealer david silver spares 01728 833020
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