UK Karting - Notice Board (4-Stroke Karting) : Re: Engine help needed

Notice Board (4-Stroke Karting)

Re: Engine help needed
Posted by 'BrianP' on 30 Apr 2009 @ 21:24

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BrianPJoined: August 2001
Total Posts: 41
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sounds like the bores are glazed and will prob' show up as low compression.

If it is glazing then mixing the oils is prob' the cause.

Do compression test and post what pressures you get.
Just in case you aren't familiar with doing a compression test here's my method.
#make sure on/off switch is set to off
#remove rocker cover
# flip exhaust valve rocker off valve
# remove exh v/v rotator to save losing it
# screw comp tester into plug hole
# open throttle
# pull engine over with pull start about six times in quick succession (watch for needle climbing within gauge
# read off maximum pressure attained
# vent pressure from gauge
# repeat for other engine
If below 120 then strip engine and deglaze with a glaze buster from machine mart ( 3 legged tool fits in pistol drill and a few up and down strokes changes the bore from shiny to matt. If you do it correctly it will look like crosshatching on the bore)
# clean bore with petrol
# rebuild with new rings and refill with new oil
# redo comp test

done!

Brian P.

Message Thread:

Engine help needed by 'lee65' (30 Apr 2009 @ 19:51)

Re: Engine help needed by 'BrianP' << You are here!

Re: Engine help needed by 'lard ass bob' (01 May 2009 @ 0:33)

Re: Engine help needed by 'lee65' (02 May 2009 @ 0:13)

Re: Engine help needed by 'lard ass bob' (02 May 2009 @ 6:24)

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