help me

baldy · World Chat Champion Joined: 15 Feb 2004 Karma :

Please help i have just boaught a 2001 NSR125r and it seems to be making some strange noises. When it starts it has a crunching sound to it like the bearings have gone but it is coming from the rc valve area. Please help i don't want to break my new bike Question

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Is the noise just when you start it, just when you turn the ignition on or all the time when the engine is running?

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

baldy · World Chat Champion Joined: 15 Feb 2004 Karma :

the noise is only when the bike is on the tickover

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

The power valve does not move (from memory) until quite a way past idle. So if the noise is only there at idle then it is probably not the power valve. However I have seen one of these fail. They are not easy to check without pulling a fair amount to pieces. Unless you have some experience I would hesitate to say for you to start to pull the power valve apart.

In the same rough area you have the water pump and the oil pump. The oil pumps rarely go badly wrong on 2 strokes, but the water pump can. If the water pump fails is is likely that it would leak water, and the main place it would leak would be into the clutch casing (I think). As such check for any water leaks and also check the gearbox oil level (there is a small window to view the gearbox oil level). If the level has gone up from water contamination then the gearbox oil is likely to look like mayonaise.

Also in the same area is the exhaust gasket. If this is blowing then it would make a fairly nasty noise, but not like things being crunched together.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

ProXimaCore · Dougal Joined: 01 May 2003 Karma :

Yesterday after a long ride on the bike I stopped off to get petrol and when I started up the bike again it made a crunch noise only when the engine fired up. Then it was fine. Turned it off again and tried it once more. It happened again. I haven't had the chance to check it again today. That was the first time that's ever happened. Should I be worried?
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Honda NSR125R -> Suzuki GSXR400R GK76a -> Kawasaki ZX636 B1H -> Honda CBR400RR NC29 -> Nothing Sad

Ste · Not Work Safe Joined: 01 Sep 2002 Karma :

Where did the sound come from on the bike?

Generally, strange noises are a bad thing. Cos they are things like your gearbox making them. Crying or Very sad

McJamweasel · BCF Junkie Joined: 22 Mar 2002 Karma :

Yes. Be very worried.

The sky is about to fall down onto your head.

And small frogs will eat your toes.

That goes for everyone else too.
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BCF: Be yourself, just don't be an arse.

ProXimaCore · Dougal Joined: 01 May 2003 Karma :

McJamweasel · BCF Junkie Joined: 22 Mar 2002 Karma :

Does it feel like its now down on power at all?
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BCF: Be yourself, just don't be an arse.

ProXimaCore · Dougal Joined: 01 May 2003 Karma :

McJamweasel · BCF Junkie Joined: 22 Mar 2002 Karma :

Is the chain tension right and is it properly lubed?
____________________
BCF: Be yourself, just don't be an arse.

ProXimaCore · Dougal Joined: 01 May 2003 Karma :

McJamweasel · BCF Junkie Joined: 22 Mar 2002 Karma :

Actually - I just read the post again. Its unlikely to be that (although check it anyway). It might be worth you whipping the starter motor off and greasing that up.

How long is it since the piston/rings have been changed?
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BCF: Be yourself, just don't be an arse.

ProXimaCore · Dougal Joined: 01 May 2003 Karma :

dainesefreak · World Chat Champion Joined: 04 Apr 2003 Karma :

It's always a bad thing when the bike seems to be running really well, then starts making noises.

Sounds silly but have you checked the oil levels?

ProXimaCore · Dougal Joined: 01 May 2003 Karma :

baldy · World Chat Champion Joined: 15 Feb 2004 Karma :

Thanks kickstart. Helped me find out what it could be. Still not solved the problem BUT i think it must be the water pump because it seems to be leaking water and oil but i cant seem to find out where it is coming from. I have just removed the water pump thingy (just the cover and the fan thing) and started it up for a few moments which is a bit silly i know but i needed to know what the problem was. the rattling seem to not be as bad. If this is the problem could you please send me some info and maybe some diagrams on how to remove or fix this. Any help would be good as i am not exactly bright when it comes to watercooled engines. Thumbs Up

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

The NSR manual is around for download. Think Scotty or Ste might have it uploaded.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

baldy · World Chat Champion Joined: 15 Feb 2004 Karma :

The links on their sites are not working. Anyone know anywhere else Question