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Misfire, help please
https://www.ausmini.com/forums/viewtopic.php?f=2&t=13161		 Page 1 of 2
Author:  TK [ Tue Nov 15, 2005 10:50 am ]
Post subject:  Misfire, help please
Just got Dad's Moke back from being tuned up by a Mini Expert.

It has a newly reconditioned stock 1275 with single HS6.

First drive (on highway) and she went very well for about 15 minutes then she started to splutter and die. I waited for a while and she fired up and went for another 5 minutes, waited again then it happend again. Eventually getting less and less mileage before spluttering and dieing. I didn't think that I'd get home.

The Expert replaced dizzy cap, condensor, and points.

My thought is fautly coil. What do you guys reckon?
Author:  Mike_Byron [ Tue Nov 15, 2005 10:57 am ]
Post subject: 
Could be coil but....

I had the following happen quite recently. The points were a cheaper set. When the engine got hot the plastic bit that rides over the dizzy cam became soft (changing the points gap) and the engine would do exactly as you noticed. It would cool and it would drive okay until the process repeated itself.

Since the engine has had a tune up - check the work and materials used by the mechanic as history says that that will be here the problem is.
Author:  fuzzy-hair-man [ Tue Nov 15, 2005 10:59 am ]
Post subject: 
Is fuel getting to the carby OK? Fuel filter?
Is it fouling plugs?
Timing?
Author:  clubby123 [ Tue Nov 15, 2005 11:20 am ]
Post subject: 
was it raining!!!
Author:  TK [ Tue Nov 15, 2005 11:35 am ]
Post subject: 
Raining? LOL

I'll check the points gap thanks.
Author:  marcsvenson [ Tue Nov 15, 2005 11:45 am ]
Post subject: 
i would have guessed condensor
Author:  BeanMe [ Tue Nov 15, 2005 12:14 pm ]
Post subject:  g
Im with Mike Byron
The same thing happened to me, after having the distributor replaced by an expert. Replaced coils, condensors and plugs and leads... and it was moving points as discussed by Mike. Look there first. Im sure this is your problem and it may save u a few bucks too...
Author:  DJG-14U [ Tue Nov 15, 2005 12:16 pm ]
Post subject: 
My Kawasaki GPX-600R use to do that exact same thing..

It would run perfectly for around 5 mins then die. But after waiting for a few minutes she would fire up again and it would run perfectly for another five minutes then I had to repeat the process over and over again..

Anyway I ended up fixing the problem and it turned out to be that my fuel filter was clogged full of rubbish. As there was that much gunk in there the fuel could not be dilivered properly and would run dry. But after a period of a few minutes the fuel filter would fill back up again with fuel and it would run again.

So it might be in your interest to check your fuel filter :)..
Author:  TK [ Tue Nov 15, 2005 3:15 pm ]
Post subject: 
well it's not the coil.

Dad spent $500 to get this thing to run right. Very disappointing!!!!

Oh well now to find some feeler gauges to check the points. Then to the fuel filter.
Author:  9YaTaH [ Tue Nov 15, 2005 4:24 pm ]
Post subject:  What has changed....
Check what was changed most recently by substitution....brand new points can be cactus in a very short time if there is a problem, new condensers can perform not so new etc ....I would start by checking the plug leads and ensuring they are making good contact at both ends and and that the leads are consistent resistences...then on to fuel.
Author:  Spaceboy [ Tue Nov 15, 2005 4:56 pm ]
Post subject: 
take it back to the guy you spent $500 and get him to fix it for no extra
Author:  mini_matt [ Tue Nov 15, 2005 5:03 pm ]
Post subject:  points
id say points first they tend to close up very shortly after being changed if there cheap
Author:  TheMiniMan [ Tue Nov 15, 2005 6:00 pm ]
Post subject: 
Take the fuel tank cap off & try again Ty

not kidding,,,Mokes are notorious for having the wrong tank cap fitted which doesn`t let them breath well enough & a slight vacuum is created making it so dam hard to suck more juice out of it

just a thought,,,seen many many mokes have this exact problem

silly hey?

:-)

easy-peasy
Author:  danidad [ Tue Nov 15, 2005 6:23 pm ]
Post subject: 
thats a niffty trick Matt never would have thought of that one.. last place i would have thought of looking.. im still backing points plugs or leads though..
Author:  drmini in aust [ Tue Nov 15, 2005 6:41 pm ]
Post subject: 
Check the valve clearance. I once had a motor (not Mini) in a paddock basher that would run for 15 mins then quit- 10 mins later you could start it again and run for 5 mins then quit again.
Turned out all the exhaust clearances were so close- when it got hot it was holding the valves open. So no compression = no go. :lol:
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