MaTt 93

iTrader: (8)

Hi,
I bought a losi 8ight that came with a os vspec. Well anyway i can't get get it statered because it is so tight And it blows the plug everytime i bump it over on the stater box. I'v tried Heating it up to 110 degrees celcius but it still blows the plug. Any ideas what to do next ?

Oh yeah the engine wasn't new but it had just been pinched.

Thanks,
Matt

losi_racer

iTrader: (25)

could of been pinched wrong?

try this too


loosen the glow plug about half a turn after you heat it then try starting it. that will relieve pressure in the motor, just tighten it back up if it starts

Illbreakthat

iTrader: (1)

What do you mean by the plug is blowing? Just burning out or its popping out of the engine?

MaTt 93

iTrader: (8)

They just stop working, I'v gone through about three brand new O.S plugs.

I'v tried that but it still Just burns out the plugs.

losi_racer

iTrader: (25)

o well if its burnin the plugs out you have a air leak.

losi8lunie

Take the head off and check that there are at least 2 shims in there.

Is your glowstart a seperate handheld one or the type thats powered off the starter box. It could be 2 much voltage through the glowplug thats popping it?

Some starter boxes allow you to adjust the voltage - it should be 1.2 volts if memory serves me correctly

jpalessi

iTrader: (55)

Matt, you should check out how many shims is under the head, and make sure there is no debris in the engine..
What OS plug you using?

Also i would reset the carb to these settings

IDLE: 1 full turn (from just fully closed)
LSN: 4 full turns from closed
MRN: 3-3/4 turns from closed (flush) 10 o'clock
HSN: 3 full turns from closed

MaTt 93

iTrader: (8)

From memory i think theres only one shim there. I'll see if i can find another one and i'll try it then.

i was useing the p3 plug.

Would it have anything to do with what pipe im useing ?

losi8lunie

What colour is the shim, grey is .2 copper .1 i think. what percentage nitro are you using?

jpalessi

iTrader: (55)

It could be anything.. if there's only one shim that could deff be your problem..
is there any leaking around the carb or front bearing? like losi-racer said it could be an air leak.

http://www.amainhobbies.com/product_...ducts_id/25728

anytime a glow plug gets burnt out.. it's timing... so too lean, and or debris in your engine is the first thing that comes to mind.

MaTt 93

iTrader: (8)

i think its a copper one. im useing 25% nitro

losi8lunie

if you only have 1 copper shim then i would say the compression is to high, it should be one grey and 1 copper standard for 25% - in effect you have increased the compression by 66%!!!!!!!!!!!!

MaTt 93

iTrader: (8)

ok, i just oulled off the head and there was 2 copper and one silver in there. But when i had a look at the sleeve there was what looked like a bearing seal in there. when i took the plug out i still couldn't turn the motor over by hand.

Thanks for all these helpfull replies

jpalessi

iTrader: (55)

shims are correct...Don't touch!

I knew there was something in there! TIMING!
it maybe the washer seal, that sits under the carb in the emotion tube.
I would take the whole engine apart, and inspect everything.. Good luck!

losi8lunie

JPAlessi +1

Also if you go to the OSENGINES.com website you can download the manual so you can check what should be where inside

Good Luck - there great when there running!!!