Posted by Trev on April 13, 2009, 8:52 am
Hi all
Any pointers as where to begin? 1100 is rough as a pig on the righthand pot
coughing and spluttering alot. Happens all through the rev range tickover or
flat out. Exhaust does get hot so it is obviously going bang in there every
now and again. Can I rule out the coil with it being fed by two different
ones? I guess with the other trhee cylinders running sweet I can rule out
timing. I know reading this is pointing me in one direction but does anyone
have any ideas that I can try before I take the carbs off . If it comes
to carbs off time is there anything in particular I shold look out for? If I
can sort out this missfire that will be me a happy boy for the summer!
Cheers
Trev
Posted by + on April 13, 2009, 9:13 am
> Any pointers as where to begin?
Swap the righthand and left hand spark plugs. If the symptom moves to
the left hand cylinder, it's a defective plug.
If that doesn't locate the problem, add about 5 ounces of Berryman B12
Choke and Carburetor Cleaner to a full tank of gasoline and ride the
bike until the solvent cleans the crud out of the ports and passages
of the carburetor.
B12 is handy because it comes in liquid form in a 15-ounce can.
If you can't find B12 in a local store, use a clear aerosol carburetor
cleaner like STP or GumOut and spray it into a small container so you
can measure it into the gas tank.
Don't get any on your paint, it contains acetone and toluene and
methyl alcohols.
Posted by The Older Gentleman on April 13, 2009, 12:21 pm
> does get hot so it is obviously going bang in there every
> now and again. Can I rule out the coil with it being fed by two different
> ones? I guess with the other trhee cylinders running sweet I can rule out
> timing. I know reading this is pointing me in one direction but does anyone
> have any ideas that I can try before I take the carbs off . If it comes
> to carbs off time is there anything in particular I shold look out for? If I
> can sort out this missfire that will be me a happy boy for the summer!
It probably isn't the coil if it's just the one pot, but are you *sure*
it's just the one cylinder? Defective coils are, um, deceptive, and the
symptoms you describe are exactly the same as my old air-cooled GT750
Kawasaki shortly before a coil died.
If you're certain it's just the one cylinder, swap the plug to another
pot. Then the plug cap. Then swap the coil. See if the fault transfers.
Ignore Krusty's blathering about carb cleaner unless the bike's been
laid up for a long, long time.
--
BMW K1100LT Ducati 750SS Honda CB400F SH50 Triumph Street Cripple
If you don't know what you're doing, don't do it. Workshop manual?
Buy one instead of asking where the free PDFs are
chateau dot murray at idnet dot com
Posted by Trev on April 13, 2009, 12:51 pm
>> does get hot so it is obviously going bang in there every
>> now and again. Can I rule out the coil with it being fed by two different
>> ones? I guess with the other trhee cylinders running sweet I can rule out
>> timing. I know reading this is pointing me in one direction but does
>> anyone
>> have any ideas that I can try before I take the carbs off . If it
>> comes
>> to carbs off time is there anything in particular I shold look out for?
>> If I
>> can sort out this missfire that will be me a happy boy for the summer!
> It probably isn't the coil if it's just the one pot, but are you *sure*
> it's just the one cylinder? Defective coils are, um, deceptive, and the
> symptoms you describe are exactly the same as my old air-cooled GT750
> Kawasaki shortly before a coil died.
> If you're certain it's just the one cylinder, swap the plug to another
> pot. Then the plug cap. Then swap the coil. See if the fault transfers.
> Ignore Krusty's blathering about carb cleaner unless the bike's been
> laid up for a long, long time.
its got two plugs per pot and the ht leads come from different coils id have
to look at the book to know which feeds which. The bikes new to me but I
know it has been stood for a while as the mileage was 10446 in 2000
according to the mot sheet ive got for it its now just short of 12000 so I
guess its been stood a long while.its had loads of work for the mot
2 tyres
back shocks
chain and sprockets
new exhaust 4into1
rear disc
Which do point to some time off the road. So its carbs off time then ho hum
if theres one thing I dont like to fiddle with its little things with
pingfuckits inside!
Thanks all
Trev
Posted by The Older Gentleman on April 13, 2009, 1:05 pm
> its got two plugs per pot
Oh yes, so it does. I forgot that. It's not going to be a duff plug,
then. Odds are against it. ISTR those things run quite happily on one
firing plug, although you lose efficiency. For *both* plugs on one
cylinder to be duff...
..well, it's possible, but unlikely.
>and the ht leads come from different coils id have
> to look at the book to know which feeds which.
One coil will feed pots 1&4 (counting from the left) and the other will
feed 2&3.
>The bikes new to me but I
> know it has been stood for a while as the mileage was 10446 in 2000
> according to the mot sheet ive got for it its now just short of 12000 so I
> guess its been stood a long while.its had loads of work for the mot
>
> 2 tyres
> back shocks
> chain and sprockets
> new exhaust 4into1
> rear disc
> Which do point to some time off the road. So its carbs off time then ho hum
> if theres one thing I dont like to fiddle with its little things with
> pingfuckits inside!
Thing is, if the fuel had turned stale it would probably have gummed
more than just one carb. I really would check the ignition side of
things first before you start pulling the carbs.
--
BMW K1100LT Ducati 750SS Honda CB400F SH50 Triumph Street Cripple
If you don't know what you're doing, don't do it. Workshop manual?
Buy one instead of asking where the free PDFs are
chateau dot murray at idnet dot com
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