rayward
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| posted on 12/6/09 at 06:54 PM |
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Any 2 stroke / scooter experts in the house?
right , just rebuilt the daughters scooter engine (50cc liquid cooled derbi predator)
new crank bearings and seals, barell head and piston, along with all gaskets,.
after refitting the engine, it started fine, sounded good, left ticking over in garage run up to temp, and turned off.
went back half hour later, and would not start?
have good spark, and good compression, the plug is wet (if a little oily) i did however pre mix the 2 stroke with the petrol, as well as having oil in
the autolube tank, (the kit instructions said to do this while running in)
there are 2 adjustement screws on the weber carb one for air(Set 2 turns out as manual says) and another low speed mixture adjustment which i;m not
sure where it should be set.
any ideas peeps?
cheers
Ray
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Danozeman
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| posted on 12/6/09 at 06:59 PM |
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2 strokes will oil the plug up and knackere it if there alot of oil in the mixture. Have you got another plug to try?
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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David Jenkins
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| posted on 12/6/09 at 06:59 PM |
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If it's anything like the 2-stroke I used to own, there's no way it'll start with a wet plug!
I used to carry a spare plug in case I forgot to close the choke when out and about, and if at home I used to toast the wet plug over the gas ring.
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rayward
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| posted on 12/6/09 at 07:01 PM |
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cheers fells, confirming my own thoughts really
will get a fresh plug tomorrow and try again
!!!
Ray
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handyandy
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| posted on 12/6/09 at 07:02 PM |
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or take plug out & hold it above a small flame (lighter) to burn all oily residue away then try again, also as you premixed the fuel did you turn
fuel tap off when you stopped the engine? if not then do so.
hth
andy
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balidey
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| posted on 12/6/09 at 07:03 PM |
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you don't need a new plug, just wipe the one you've got. And yes they do like to be bone dry.
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mistergrumpy
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| posted on 12/6/09 at 07:07 PM |
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Vote for the plug too. Happened when I had a Vespa. Just stopped working once at the traffic lights.
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phoenix70
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| posted on 12/6/09 at 07:34 PM |
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Third vote for plug. When I rebuilt my 2 stroke bike years ago I was paranoid about seizing it again, so upped the oil and then had no end of trouble
with the plugs.
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rayward
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| posted on 12/6/09 at 07:42 PM |
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nice one ,
just warmed the plug up as suggested and it fired and ran for a few seconds,
will drain the premixed fuel tomorrow and get a new plug
locostbuilders does it once again
thanks!
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Danozeman
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| posted on 12/6/09 at 08:35 PM |
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New plug and fresh fuel should do it.
If you can, turn the oil pump up a touch while you run in the new rings rather than premixing. If not then just a dash of 2 stroke in the petrol.
The newer 2 strokes can be a right pain.
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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rayward
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| posted on 12/6/09 at 09:21 PM |
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no adjustment on the oil pump as far as i can see, will check again tomorrow
Ray
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IanBrace
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| posted on 12/6/09 at 09:25 PM |
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Be very careful with the fuel /oil ratio. More oil means less petrol, less petrol means weak mixture, weak mixture usually leads to either holed
piston or heat seize.
I've seen dozens of wrecked engines over the years where people had just added a bit more oil to make sure it doesn't seize! WRONG!
By all means turn up the oil pump very slightly but don't add any to the petrol..
www.aerialphotography.org.uk
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