This bike is driving me crazy!!!

[FilthyLuka]

Also I don't think it's a top end, because it can work perfectly and pull really hard for one hour or even two, and then suddenly, looses power and does not hold the idle.

it sounds like top end

seriously now, check the rings... now just maybe (now im just takin the piss), the last fool put oversized rings in when they werent needed... so when it gets uber heated (like after and hour or two of riding ) the rings expand and create Uber friction between the bore and rings, effectively making piston travel stupid difficult and resulting in arse running...

hehe, but no... probably not.

The pulling hard bit is relative... if you havent ridden a nsr thats in prime engine condition you wouldnt know how hard it can actually pull... for all you know, your bikes running like a sissy. That being said an nsr running like a sissy will still pull like a mofo but thats not the point!. Pick up a manual, take of the top end and check the wear and tear on the bits and pieces. Piston rings, pistion, bore, gudgeon pin, bearing ect. ect. Also, check your loom. You might have a bare wire that after running for a while shakes around a bit and shorts the system, effectively rooting one piston...

Actually, that last idea is kinda plausible... Check your loom! wrap bare peices in insulation tape... while your at it, grab some wee little cable ties and just tidy everything up, makes electrical faults less of a pain to diagnose in the future...

#twitch# coffee time #twitch#

denden

[FilthyLuka]

Aparently I'm using the race plugs, and the guy at the shop told me they are the good model for my bike. Also there isn't a hotter version (I think mine are 10).

I'm putting 95 or above - the highest I can find (usually 95). I know 2 strokes don't get along too well with low end fuel.

pick up some feeler gauges from repco (its like $3 and a squashed orange for a set) and set the plug spacing. The area between the two plug connections... err... the metalie bit on the top and the round stumpy thing beneath the metalie bit... google for optimal spacing... tap the plug on a metal surface to make the gap smaller and use a strip of metal (side of the feeler guage works good) to pry it open if its too small. Check, double check, reinstall.

[FilthyLuka]

another thing... check your carbs.

what might be happening (this happened to my brother with one of his bikes), is youll ride it round and when the carb gets hot, the float gets stuck. Effectively flooding you cylinder and making one cylinder not fire and fuel mixture to drip out the exhaust pipe... either way your gonna be getting your hands dirty.

and just because you can... soak your plugs in vinegar to remove any built up crap and gunk you couldnt get to with sand paper....

[xxblackbirdxx]

No. The lights are ok even when the problem apears. and it appears to be on only one of the cylinders. I was suspecting a faulty wiring to one of the plugs (a cut/loose wire that comes off sometimes). Is there any way I can check if a plug gets power?

Unscrew the plug, put it back in the wiring plug and earth the tip of the plug to the engine or any other metal surface on the bike where it can earth. crank the engine and see if you can see the spark being generated at the tip of the plug. the ignition will need to be on. check both of them(plugs). if you find that the spark on one plug is weak then check the wiring for faults or lose connections.
Still cant solve it.?
Look at your fuel lines and ensure that they are not partially blocked.
Still cant slove it?
Go back to the carb and if you know how give it a thorough service and ensure your floatbowl settings are correct.
Still cant solve it?
Then you probably have a problem with intake, check reeds and your power valves if this bike has any.
Still cant solve it?
you probably have your choke on or maybe the choke cable is stuck.
Still cant solve it?
write back and i'll see if i can get some more checks you could do before sending it to a shop and begging them to slap you with a big bill.
Good Luck..
If there is anyone out there who feels that i have given wrong advice , please send me a line and correct me

[xxblackbirdxx]

Unscrew the plug, put it back in the wiring plug and earth the tip of the plug to the engine or any other metal surface on the bike where it can earth. crank the engine and see if you can see the spark being generated at the tip of the plug. the ignition will need to be on. check both of them(plugs). if you find that the spark on one plug is weak then check the wiring for faults or lose connections.
Still cant solve it.?
Look at your fuel lines and ensure that they are not partially blocked.
Still cant slove it?
Go back to the carb and if you know how give it a thorough service and ensure your floatbowl settings are correct.
Still cant solve it?
Then you probably have a problem with intake, check reeds and your power valves if this bike has any.
Still cant solve it?
you probably have your choke on or maybe the choke cable is stuck.
Still cant solve it?
write back and i'll see if i can get some more checks you could do before sending it to a shop and begging them to slap you with a big bill.
Good Luck..
If there is anyone out there who feels that i have given wrong advice , please send me a line and correct me

Also check the plug gaps and ensure the gap is set right

[FilthyLuka]

Also check the plug gaps and ensure the gap is set right

see my previous posts....

[centaurus]

Does anybody know where I can buy/borrow/copy/steal a Honda NSR repair manual? I found some info on the net but it's far from sufficient if I start taking off the carburetter, checking the wiring or meddling with the cylinders (let's hope this won't be necessarry )

[Posh Tourer :P]

Aparently I'm using the race plugs, and the guy at the shop told me they are the good model for my bike. Also there isn't a hotter version (I think mine are 10).

I'm putting 95 or above - the highest I can find (usually 95). I know 2 strokes don't get along too well with low end fuel.

Try change the plug. All you changed to create the problem was plugs. The plug might be faulty from new. Sometimes the ceramic insulation is problematic. Even if it doesnt solve the problem, you have a spare spark plug, not a bad thing for a 2-stroke

[Ixion]

Racing plugs will always be problematic unless you are in racing conditions.And if you are overoiling as well, it will be worse.

[centaurus]

I took it apart today:
- checked the fuel
- checked the wires (as best as I could) - all of them seem ok (insulated, connected, protected form rain).
- Checked the power to the plugs
- checked the plugs - and here it gets interesting: the plug from the bottom cylinder was fowled (the cylinder connected to the right exhaust which was smoking). It was so fowled that didn't make a spark anymore.

I tried the old sparks and... surprise: one of them was working, one not. I thought it was just a coincidence. I installed the good one and the bike started at first kick, like it used to when I bought it.

To make sure that I am not dreaming, while assembling the bike back, I tried to start it again 3 or 4 times and every time it started perfectly.

I put it all together and started it to go riding. However, the right exhaust (lower cylinder) was smoking as yesterday. As soon as it warmed up and started decreasing the revs, I was just about to pull the choke in when it revved slower and slower until it died, just like yesterday.

At this point it's obvious the problem is too much oil in the bottom cylinder. The question is why. It couldn't be the actual fuel/oil mix because it would be in both cylinders,

PLEASE HELP!!! What could it be? (let's hope something not too expensive of difficult to solve ). The 2 stroke specialists, please start throwing ideeas at me please.

[Ixion]

http://www.kiwibiker.co.nz/forums/sh...5&postcount=13

[FilthyLuka]

http://www.kiwibiker.co.nz/forums/sh...5&postcount=19

[Sparky Bills]

Dude!
Id stop riding it or even starting it untill you take the barrels off!
Just to be sure your not starting to seize it.
After you are satisfied thats not the problem, move onto electrics.

Two strokes are funny things. When they are going... FARRRK do they go! But when they're not... they really are not!

Check the top end! Its not hard to do, and will eleminate another problem.

Good luck.

[Nutter34]

Another thing. DON'T use the choke when the bike is warm and don't ride it that way...

I may be wrong but to my understanding, it richens the mixture a lot and rinses the lubrication from the bores? This could in fact enhance the chance of siezing...

On a side note.... I once had an RD350 that would be great in the revs but would not idle for shite. I eventually found one of the reed petals had a chip missing, so at low flow engine speeds, it wouldn't work... I changed the petal and viola, back to happiness...

[Nutter34]

Hey Luka. I was of the impression, if the floats get stuck, they would overflow through the float bowl drain lines, not richen the mixture in any way? You would still be relying on the main/needle flow wouldn't you?
Also maybe check the emulsion tube, if the holes are blocked, it'll also have an influence, since you may not flow enough gas, then it slowly buils up oil....