nsr 125

karldavidmann... · L Plate Warrior Joined: 06 Dec 2007 Karma :

can anyone help me? i have just changed my piston and when i try to bump start it the wheel just locks and skids, it wont turn over at all.
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kdmanning

ms51ves3 · Super Spammer Joined: 08 Jun 2007 Karma :

Does it lock the wheel if you pull the clutch in as your clutch could be knackered.

salty21 · World Chat Champion Joined: 08 Jun 2006 Karma :

why bump it? that would be the last thing on my mind if i had just changed the piston, if the rings were not installed properly you could quite easily end up with shards of them in your bottom end and that would be bad plus scoring the barrel. using the electric start would be less forcefull and if it doesnt turn over somethings not right
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04 NSR 125(sold) Sad

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----90 pan euro ST1100 ' Shocked

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ZaphodBeeble · World Chat Champion Joined: 10 Feb 2004 Karma :

You should always check that the engine turns over by hand before reassembling everything. In other words straight after dropping the barrel over the piston you should turn the crank a few times. You should also make sure the piston rings line up properly. Don't force it too, it should take very little effort to turn the crank with no head on it. Thumbs Up

Z
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Current bike: VTR1000F Firestorm. Previous: Firestorm (written off) - XJ600 Divvy - NSR125 - DT125 and a load of offroaders.

st3v3 · Super Spammer Joined: 16 Oct 2006 Karma :

Put it in neutral, take the head off and check the barrel's not scored, if it is get it re-bored. If it isn't, put it all back togethor minus the spark plug then put a few drops of oil down it while turning the engine over by hand. give it half an hour then start if and let it run, see how it is.
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Roger wrote: Women don't get damp for clingy puppies. Get some better happy pills, hit the gym & buy a medallion the size of a dinner plate. Job done

ncrn · World Chat Champion Joined: 24 May 2006 Karma :

Have you got a rear paddock stand? If so lift the bike onto it and try turn the rear wheel while in gear, with the clutch in and the clutch out (probably gonna need help with that).

Or if not try pushing it in gear with the clutch in and the clutch out, it is possible to do this though it'll be very heavy in gear. If it doesn't move at all when in gear then I'd be worried that you made a mistake rebuilding the top end.

You did lubricate everything with two stroke oil right?
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Past: 55 Sym Jet, 91 ZZR250, 03 NSR125R. Present: 97 ER-5.
https://www.nsr125.co.uk - NSR Owners forum.

karldavidmann... · L Plate Warrior Joined: 06 Dec 2007 Karma :

I DID LUBRICATE THE PISTON AND BARREL WHEN I PUT IT TOGETHER AND IT IS ALL IN PROPERLY. I HAVE HAD A GOOD LOOK INSIDE THE ENGINE AND SOME WATER HAS GOT IN AND RUSTED THE INSIDES SLIGHTLY. I REMOVED THE RUST AND OILED IT UP AND IT IS A BIT BETTER BUT STILL LOCKING. I HAD TO BUMP IT COZ MY STARTER IS GONE. I SUPPOSE ALL I CAN DO IS KEEP GREASING THE ENGINE UP AND CLEAN IT UNTIL IT IS FULLY LUBED AGAIN.WHAT ELSE CAN I DO SHORT OF BUYING A NEW ENGINE (CANT AFFORD IT)?
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kdmanning

ncrn · World Chat Champion Joined: 24 May 2006 Karma :

What gear are you trying to bump it in?
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Past: 55 Sym Jet, 91 ZZR250, 03 NSR125R. Present: 97 ER-5.
https://www.nsr125.co.uk - NSR Owners forum.