Could it be my immobiliser?!?

binge · Emo Kiddy Joined: 03 Jul 2004 Karma :

I was riding along on my Speedfight today and it just lost all power, backfired twice and stoped! Crying or Very sad

Its got pleanty of compression
Its got a Good spark!
There is enough fuel geting into the barrel

But it just wont fire or start...

Any ideas!?!

My ignition switch was playing up last week and I was told that it could be my immobiliser and soon it wont start at all!
Could this be the problem!

Cheers... Ben...

pipnet11 · Brolly Dolly Joined: 17 Sep 2004 Karma :

If it sparks then it isnt the immobiliser or the ignition, though it could be a close to dead spark plug. Often when they are close to finished they will spark when out of the engine but not under compression.

Does it turn over? If it does and theres definately enough fuel, and the compressions ok the first suspect would be the plug, after that im not too sure.
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binge · Emo Kiddy Joined: 03 Jul 2004 Karma :

Right, I tried it with a new plug as well as the old 1. There is a very strong spark!
when the engine is assembeled it wont fire or turn over or anything, there is nothing. But theres pleanty of compression!
at first I thaugth it was a fuel problem, but I put some neat fuel straight into the barrel and put the plug in, pressed the ignition button and nothing. It was turning over, but no spark, didnt even fire once. but it was backfireing Confused

. (without a flame).
Its baffeling me cos I just cant find anything wrong with it.
Its doing everything it should. Got spark, compression and fule. Confused

What else could it be?

Ben...

pipnet11 · Brolly Dolly Joined: 17 Sep 2004 Karma :

My extensive knowledge of 2T engines stops at this point im affraid Confused

Seems to be quite a lot of people on here who know a lot more than me about this sort of thing, so wouldn't be surprised if someone can suggest a more likely problem
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I love the girls that do, I hate the girls that dont, I hate the girls who say they will and then they say they wont, but the girl I like most of all and I think youll say Im right, is the girl who says she never has but looks as though she might. - Max Bygraves

binge · Emo Kiddy Joined: 03 Jul 2004 Karma :

Hmm, my dads just had a look at it and he thinks its a fuel problem too. But I put neat fuel straight into the barrel and still it didnt fire???

Im gona have a walk down to the local bike shop in the morning, Explain wats up with it, See When I can take it in, then ill push it down and forl out MORE MONEY Sad

Ben...

new boy · Two Stroke Sniffer Joined: 10 Oct 2004 Karma :

when it stopped did it feel like it had run out of petrol coz a friend had the same problem with his speedfighter 2
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binge · Emo Kiddy Joined: 03 Jul 2004 Karma :

Yeh kind of. My scooter has ran ot of petrol before and it felt really similar...
It kinda sounded and felt like turning the key off while driving. The engine just stoped (It stoped fireing!)

Ben...

new boy · Two Stroke Sniffer Joined: 10 Oct 2004 Karma :

we never found the problem but we got it running again Razz

we did all sorts of things but what we did find is that it was flooding so we took thecarb off and cleaned it all and just kept winding it over it backfired a few times and then fired a few times and started eventually and has been fine since Thumbs Up

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I need help

binge · Emo Kiddy Joined: 03 Jul 2004 Karma :

Hmm. well tomorrow im going to take the carb off, take all my pipes off and strip it right down to basics, clean everything out and put it all back together (with the help of my haynes manual Wink

)
and Hopefully *fingers crossed* it should fire up!
I dont get it, I was just riding along perfectly fine and it just cut out and I had to push it 3 miles home "UPHILL!" Brick Wall

Ben....

new boy · Two Stroke Sniffer Joined: 10 Oct 2004 Karma :

ive been lucky not had to push mine it all ways gets me home some how last week third gear came out through the top and stripped most gears bout 2 miles from home but still had forth gear no clutch and no other gears the week before the top end seized up at the top of the drive way coming home Brick Wall

all i can say is LOOK AFTER IT WHILE ITS GOOD NOT WHEN IT GOES WRONG (my mistake and i found the hard way)
Sad

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I need help

binge · Emo Kiddy Joined: 03 Jul 2004 Karma :

LOL! Thats the thing tho, I pamper my scooter Wink

.
Im always checking the plug, Changin it if needed, checking ma belt, checking rollers etc! and all it does is do the dirty on me!

Ben...

new boy · Two Stroke Sniffer Joined: 10 Oct 2004 Karma :

good luck with it cant be too serious it was working

thats all i keep saying to myself but it never helps Laughing

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FeRnY · Derestricted Danger Joined: 25 Sep 2004 Karma :

my speedfight 2 is in the shop atm. Its the cdi unit thats gone. just happens to cost £100+ for the actual item then installation fee etc. easy £200 to get it fixed.

had exact same problems tried everything took it into shop he plugged his test cdi in wot a shock it worked. pulled it out put the old in nothing.

Gazdaman · I did a trackday!!! Joined: 12 Aug 2004 Karma :

You need to get the mixture just right for the fuel to ignite, just bunging a bit of petrol in the piston probably won't cut the mustard.

maybe your mixture is horribly wrong, but I doubt it could get that bad unless something fell off.

Is the electric start definately turning the engine over? Shame you can't try and bump start it.

A 2T engine is extremely simple, and if there's fuel, air, and a spark, it should run like a charm. maybe the timing's horribly wrong??

any input from anyone?

Gaz

Fortuna · World Chat Champion Joined: 29 Oct 2004 Karma :

I with the above poster.
Putting neat fuel in could also flood it, causing it not to start.
Start it again and take the plug out, if it's wet with petrol you may be flooding it.
A flange split on my NS125R and it did a similar thing. Was a bastard and took ages to find.

binge · Emo Kiddy Joined: 03 Jul 2004 Karma :

Ok. So lets just say it is my immobiliser... Would it still give out a spark when its turning over?

Im pretty sure we can rule compression out of this, because it seems to have excelent compression. I took the plug out and hit the ignition, then put my finger over the sparkplug port and it was like pushing my finger right back off!

It just makes no sense because its got a spark, got fuel and compression. Surely it would at least fire once. Its not even fireing at all.

I cant see it being my mixture or anything cos it had been fine all day, and as I was driving home, it was riding perfectly, then all of a sudden it cut out.

Ive recently been having ignition problems though, and sombody said that its my CDI and that it will eventually not start at all, Is this the problem do you recon?

Gaz, I was trying to bump start it earlier but for some reason, I couldnt ingage the clutch in first... Wink

Ben...

Fortuna · World Chat Champion Joined: 29 Oct 2004 Karma :

No, shouldn't even turn over.

binge · Emo Kiddy Joined: 03 Jul 2004 Karma :

Ok, so if my immobiliser had gone, It wouldnt even ingage the starter motor. Ok thats a good thing in a way...
What about the CDI unit, or is that in with the immobiliser on the speedfights?

Ben...

Fortuna · World Chat Champion Joined: 29 Oct 2004 Karma :

Generally no spark if the CDI has gone, but it would still turn over.
I wouldn't rule it out though.

binge · Emo Kiddy Joined: 03 Jul 2004 Karma :

Ok, so what are my posibilities now then...
What should I check?

Can we say its a fuel problem?

Ben...

Fortuna · World Chat Champion Joined: 29 Oct 2004 Karma :

I would guess at fueling.
You didn't answer in the other thread, but is that the grass bank between Wordsworth and Kingfisher in your pics?
It just looks a lot like where I live.

binge · Emo Kiddy Joined: 03 Jul 2004 Karma :

Yup, its the grass bank between wordsworth and Kingfisher Wink

Where abouts do you live?

Ben...

Fortuna · World Chat Champion Joined: 29 Oct 2004 Karma :

Kingfisher. I have a silver and red R1.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

Ok, here is a wild stab in the dark as I know little about twist 'n' go engines but a motorcycle that doesn't start and backfires to me has a too far advanced spark.

Now this should not be possible as it is a CDI ignition but I have had bikes that require the gap between the CDI sensor coil and the tab on the flywheel to be adjusted periodically. If it gets too big the spark comes in at the wrong time or becomes very intermittant. The sensor coil could also have come a bit loose.
I couldn't tell you where to look for these bits on your bike and as I say it is a bit of a stab in the dark.

To me a bike with fuel and a good spark which backfires and doesn't start = ignition advanced or a lot retarded.
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binge · Emo Kiddy Joined: 03 Jul 2004 Karma :

Right. Ive been on the scooter since this morning in the garage. Ive striped it down to just a frame and wheels...
Ive traced the wires back to the Immobiliser/CDI unit and disconected it. It still turns over but no spark.
Ive reconected everything and there is a spark so I can now rule that out of the equasion...
My dads had a look at it too and he thinks that my Piston rings have gone with it being a perfonrmance 2stroke, they dont last long...
Now to me it felt like there was a lot of compression through the cylinder head, But when its turning over and I put my hand over the exhaust, theres no pressure build up??!?!

Is it safe to say its my piston rings...

(I dont want to take off the cylinder head to have a look because its liquid cooled and it means too much faffing around...

Any ideas...

Ben...