help non starter

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jon

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hi
iv got a 2 stroke gokart which i took on a track last week and siezed the engine, some **** in halfords gave me 4 stroke oil and stupid me didnt check it, iv just fitted another engine but i cant get it to start

i seen it running on the guys kart before i bought it, pushed it a few feet and it fired up straight away, but since taking it off the kart and fitting it to mine it wont start, having to push start it doesnt help.
its a 100cc pcr engine

the plug is sparking and theres fuel getting to the carb.
my guess is its something to with the carb as the only thing changed since it was last running is the carb settings, i had someone adjust them, the big screw is 1 full turn out plus 1/8, the small screw is 1 full turn out.
im using 250ml of castrol 2 stroke oil to 5 litres of unleaded.
can anyone tell me if this sounds right?

any help appreciated

Jon
 
Russ2251

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...siezed the engine, some **** in halfords gave me 4 stroke oil...
Click to expand...
4 cycle oil should not cause it to seize.
Will have other adverse effects over time.
im using 250ml of castrol 2 stroke oil to 5 litres of unleaded.
Click to expand...
If I've done the math correctly, 5 liters = 5,000 milliliters
5,000ml/250ml = 20...or... 20 to 1 gas to oil. Sounds a little heavy. Is this what the manufacturer calls for?
the big screw is 1 full turn out plus 1/8, the small screw is 1 full turn out.
Click to expand...
Sounds typical for a Tillotson and should get you going. This assumes that the high speed needle is the larger screw and the low speed screw is the smaller.
 
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jon

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i was told the oil i used is to go in the sump of an engine, not the fuel and is not enough to lubricate the bore of a 2 stroke engine. it lasted 5 laps and locked up.

the oil mixture is what i was advised when i first bought the kart, iv been running the kart for about 2 months in my local car park on a 20/1 mix and havnt had any problems up until i put the other oil in it.

yes the big screw is high speed the small being low speed, iv noticed when trying to start it that every time i take the spark plug out its wet, but its sparking ok?

i havnt got a clue about 2 stroke engines, can anyone point me in the right direction?

thanx
 
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jon

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its a tillotson carb.
im about to get my running shoes on and take it out now and try get it running, iv changed the carb to another the same, and plug so il have a play around with the settings see how it goes.
i rang a guy at the race track to check the mixture and hes advised the same. 25 to 1. sry i said 20 before its 25.
 
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if the plugs wet it's probably ignition related, have you tried a different plug is the spark good and bright(plugs can spark in open air but not spark under compression)
 
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jon

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first off can i just say thanx for all ur replies.

i took it out yesterday, swapped the carb with 1 of the same, swapped the coil pack and fitted a new plug, (no. 9).
1 little push and it fired up straight away.:auto:
i drove it round a few times and it was running well, plenty of power, bit of smoke coming out the back, i thought it was fixed.

after doing about 20 laps of the car park i was going along the straight when it just died.
the engine felt very hot and there was smoke coming off the head, i removed the head and found score marks in the bore, the piston had seized again.:mad2:

the amount of smoke coming out tells me theres plenty of fuel burning so why would it sieze again?
when i first bought it i was using cheap 2 stroke oil from my local pertol station, ever since going to halfords and getting the proper stuff iv had nothing but problems. but being castrol ud think it would be better than anything else.
i just dont understand why its seized again. is a no. 9 plug too hot?
iv cleaned the bore out with a tool i use that goes on the drill, its cleared the score marks out, im going to buy a new piston and rebuild it, otherwise its another engine.

any suggestions as to why im having these problems?

thanx

jon
 
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try using a colder plug (no. 10?) and sounds like the rings are getting poor lubrication. I would bore it out and OS the piston and rings, Run it 20:1 and it should be a lot more powerful
 
Kaptain Krunch

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solomon said:
try using a colder plug (no. 10?) and sounds like the rings are getting poor lubrication. I would bore it out and OS the piston and rings, Run it 20:1 and it should be a lot more powerful
Click to expand...

How would a colder plug help?


Boring it and running richer mix will just mask the real problem, and it may just seize again. would be best to figure out why it seized in the first place. Take a picture of the piston, and check plug color to start with.
 
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I figured the plug was burning pretty hot so it was burning more 2 stroke than lubing. He said the cylinder had some scoring, so it should be bored anyway
 
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jon

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the spark plug is white just like a normal car plug, if u mean the tip its black.
Iv taken some pics but not sure how to upload them :huh:
 
Kaptain Krunch

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jon said:
the spark plug is white just like a normal car plug, if u mean the tip its black.
Iv taken some pics but not sure how to upload them :huh:
Click to expand...

Plug should be golden brown, thats your problem. White plug means a lean running engine, which is most likely what caused it to seize.
 
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