i took my bike to the mot station toay [passed] on the way home i was doing around 60 when it sudnly droped the revs and locked the rear wheel up it was like being on ice as the back cameround i pulled the clutch in and it came back straight,i pulle over to the side and the kick start was solid.G ot it home took plugs out looked ok one was a 7s and the other plug was a 7es gave the kick start a little push and it went free i pull a bit of oil down both barrels and it turns over the same as before,its the first time out on the bike its got 100 % syn 2stroke oil in it [autolube] standard exhaust,[i think is been jetted for jollymoto pipes] so should be rich, i havend started it as there must be some problem some were,any one ever had same problem
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NSR250 MC18

Plugs should be BR9ECM's for a start. Running incorect hotter plugs isn't going to have done you any favours I'm afraid.

Take the pipes off and have a look up the exhaust ports is the first step. Usually only one cylinder will go, but you never know.

As was said in another recent thread, "assumption is the mutha...". You can't assume that because it may have been jetted for Jolly's that it will automatically be rich on standard pipes. It's likely to be a rather costly £200+ assumption I'm afraid.
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Andy.
NSR-WORLD.COM

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Last edited by Andy on Sun Apr 05, 2009 12:17 am; edited 1 time in total

thanks for your reply andy, i am sorry just looked again and the bottom barrel
br9ecs and top barrel had br9es in

o o


Last edited by DifferentStrokes on Mon Sep 28, 2009 6:29 pm; edited 1 time in total

Hi
I have PM'ed you with some info . Sorry to hear of your problems.

Hi yes it was new putoline injector oil fully syntetic,this screen is it like a filter and were is it,is there a way i can test the oil system ie see it squirt oil into the engine/carb
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NSR250 MC18

I doubt theres anything wrong with that side of it.

This is what happens sometimes.

Pull the barrel off replate/replace it/them and start again. No point getting worried over it. I'm sure you will go through this more than once as most of us have.
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If I have to take the carbs off once more...

StephenRC45 wrote:I doubt theres anything wrong with that side of it.

This is what happens sometimes.

Pull the barrel off replate/replace it/them and start again. No point getting worried over it. I'm sure you will go through this more than once as most of us have.

I'm sorry but I dont agree. There has to be something thats caused the seizure, two strokes dont 'just' seize every so often for no apparent reason so it would be wise to find the cause of it going pop before it goes again surely?

Jetted wrong and running the wrong plugs might qualify as a reason
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Please do not PM me technical questions, if you can't find it on the Forum start a thread

o o


Last edited by DifferentStrokes on Mon Sep 28, 2009 6:29 pm; edited 1 time in total

o o


Last edited by DifferentStrokes on Mon Sep 28, 2009 6:30 pm; edited 1 time in total

fontyyy wrote:Jetted wrong and running the wrong plugs might qualify as a reason

Thats what I was getting at, thank you Stace.
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If I have to take the carbs off once more...

hi all and thanks for all your advice,i managed to get in contact with [howl] and what a great bloke told me all about the bike and its past,i took off both barrels today bottom barrel mint,top barrel had rubbed piston skirt to barrel. so i have cleaned the barrel with a scotchbrite,removed all alloy from barrel,and luckly when i brought the bike i got 2 spare pistons that came from those barrels, i was going to put just one in but when i weighed the pistons and pins etc there was 10g difference so am going to put pair in,
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NSR250 MC18

i have taken pics o barrel and piston but cannot find the attatchment bit

Hi
The spare pistons were matched with the spare barrels that I sold with the bike . Check if they have the same letter stamped on them or measure them to make sure they are the same as there was 3 diffrent sizes ( A,B & C ) if I remember correctly.
Have you found a reason for the seizure ?