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andyjonc |
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andyjonc Two Stroke Sniffer
Joined: 20 Mar 2012 Karma :
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Posted: 21:15 - 13 Jun 2017 Post subject: speedfight2 non-start |
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first of all an apology: i know it's likely that this topic has been discussed in the past. i HAVE tried to do a search, and read many threads already, but have been unable to solve my problem so am posting a new thread. please be gentle with me
i have a speedfight2. it used to run. then it sat in my shed for a couple of years. now i cannot get it started.
i currently have it connected to a good battery, i have checked spark (both seen spark on cylinder head and using a spark tester), i have fuel flow (with fresh fuel - checked carb, pulled hoses, observed fuel flow), i have removed exhaust in case it was blocked, when winding engine over using starter can see exhaust/unburnt fuel exiting exhaust port. i have checked compression and it has 60psi (i do not know the spec for this though so this may be too low?)
do all speedfight2's have an immobiliser? i didn't think mine did, but have read this as a possible fault on previous threads.
could it be the auto-choke? i don't know a lot about these
electrics on scooters aren't a strong point, but i would expect that if fuel is getting in, there's a spark, and a free exhaust... then the engine should run surely??
i am at a loss... can anyone help??
many thanks in advance!
Andy |
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RhynoCZ |
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RhynoCZ Super Spammer
Joined: 09 Mar 2012 Karma :
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Posted: 21:24 - 13 Jun 2017 Post subject: |
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I bet my money on the immobiliser.
A bypass unit: https://youtu.be/EcndPGpMKlA?t=1m33s ? ____________________ '87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor |
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Paulf |
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Paulf Nova Slayer
Joined: 24 Jan 2017 Karma :
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andyjonc |
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andyjonc Two Stroke Sniffer
Joined: 20 Mar 2012 Karma :
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Posted: 17:32 - 17 Jun 2017 Post subject: |
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ok so i reattached the exhaust just to double check the compression stayed the same. it stayed at 60psi.
i then noticed my compression tester was using a rubber extension hose... surely that would swell and affect the pressure reading?? so i removed that and connected directly to the metal connector. compression went up to 80psi. better but still too low.
so i put a little bit of oil in plug hole and refitted the spark plug. when i thumbed the starter it still didn't fire but did cough, once. encouragement!
i put my thumb over the exhaust and after a few spins the engine fired! it started!! i can only assume that blocking the exhaust momentarily, increased the pressure in the cylinder and helped the fuel ignite?
lot's of smoke but it's running. happy days! |
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andys675 |
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andys675 World Chat Champion
Joined: 08 Feb 2007 Karma :
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Paulf |
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Paulf Nova Slayer
Joined: 24 Jan 2017 Karma :
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andyjonc |
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andyjonc Two Stroke Sniffer
Joined: 20 Mar 2012 Karma :
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V2 |
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V2 Nearly there...
Joined: 06 Feb 2006 Karma :
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Posted: 20:13 - 21 Jun 2017 Post subject: |
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The valve clearances are simple on a two stroke - they don't have valves |
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Paulf |
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Paulf Nova Slayer
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andyjonc |
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andyjonc Two Stroke Sniffer
Joined: 20 Mar 2012 Karma :
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Paulf |
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Paulf Nova Slayer
Joined: 24 Jan 2017 Karma :
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V2 |
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V2 Nearly there...
Joined: 06 Feb 2006 Karma :
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Old Thread Alert!
The last post was made 6 years, 337 days ago. Instead of replying here, would creating a new thread be more useful? |
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