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thermal efficency
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Topic: thermal efficency (Read 3465 times)
gsxrsam
Sr. Member
Karma: 4
Posts: 283
thermal efficency
«
on:
May 20, 2009, 08:27:23 AM »
heres an interesting problem for you too mull over..
xj900s divvy, starts, sounds ok, no 1,2,3 exhaust pipes get hot after 30 secs.
no 4 cold after 2 mins
pull plug lead off no 4, it coughs barks and stops...
put back on all good again but still cold
carbs cleaned and rebuilt and new plugs etc...
interesting prob huh lol
will be fiddling with it today..
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i have decided to live forever or die trying
ByzMax
Hero Member
Karma: 57
Posts: 1637
Choppit
Re: thermal efficency
«
Reply #1 on:
May 21, 2009, 11:36:57 PM »
My first route would be to swap plugs with a good cylinder just in case you have a dud new un.
Then if you have a redundant spark system (two coils four cyclinders) then swap the plug leads for that coil.
If the problem is still on the same cylinder then
check compression and then carb..
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trev
Hero Member
Karma: 52
Posts: 1399
Re: thermal efficency
«
Reply #2 on:
May 22, 2009, 11:03:02 AM »
you could try taking the plug cap off the cold one with a pair of pliers while the engine is running and hold it close to the top of the plug and make it arc across for a few seconds and then put it back on,its worked for me a few times
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yes but can blue men sing the whites?
gsxrsam
Sr. Member
Karma: 4
Posts: 283
Re: thermal efficency
«
Reply #3 on:
May 22, 2009, 02:28:25 PM »
ok, just to mess with your head a bit,
pull off plug lead it stops engine so its firing..
comp test shows minimal difference between all 4 cyls..
swap leads 3/4 over still runs but 4 still cold!!
carb now has new emulsion tube and main jet holder in but no difference.
fun huh
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Manky Monkey
Administrator
Hero Member
Karma: 264
Posts: 55102
Re: thermal efficency
«
Reply #4 on:
May 22, 2009, 06:17:56 PM »
Sure it's not something really basic, like a blocked fuel line? There's definitely a spark at the plug if you lay it on the cylinder head & spin the engine over? The spark's not getting diverted somewhere else once it's fitted -like a crack in the head?
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gsxrsam
Sr. Member
Karma: 4
Posts: 283
Re: thermal efficency
«
Reply #5 on:
May 22, 2009, 06:44:31 PM »
Quote from: Manky Monkey on May 22, 2009, 06:17:56 PM
Sure it's not something really basic, like a blocked fuel line? There's definitely a spark at the plug if you lay it on the cylinder head & spin the engine over? The spark's not getting diverted somewhere else once it's fitted -like a crack in the head?
one fuel line, it is pump fed [cos im posh], it goes to centre of carbs and all float bowls are full..
if head was cracked i would expect comp tester to show up that, plus you really should be able to hear/see if it was arcing off somewere else
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Manky Monkey
Administrator
Hero Member
Karma: 264
Posts: 55102
Re: thermal efficency
«
Reply #6 on:
May 22, 2009, 06:45:58 PM »
Yeah, true. Certainly odd.
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Hillbilly Deluxe
Hero Member
Karma: 9
Posts: 645
i dont have an attitude ....maybe it's just you ??
Re: thermal efficency
«
Reply #7 on:
May 28, 2009, 02:28:12 PM »
Have you ever had this bike running right ? if so what has been changed ?
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gsxrsam
Sr. Member
Karma: 4
Posts: 283
Re: thermal efficency
«
Reply #8 on:
May 28, 2009, 07:17:47 PM »
ok we have progress,
went up a staggering 44 sizes in main jets and is now on all 4
still wont pull flat out so might need to go higher
the joys of motoring huh..
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