only running on Two....

robatsea · Post by **robatsea** » Fri Mar 21, 2008 13:12

Any ideas's, the Two cylinders under the right carbs (when looking from near side) are getting a good spark to them but when pulling off the leads their is no change in the engine sound. I have taken all four plugs out brushed them down and checked the spark on top of the rocker cover.

Performance is very good considering, no flat spots and really good pick up.

Could it be valves or rings sticking?

If so what would be the next course of action.

MAny thanks

Markexel · Post by **Markexel** » Fri Mar 21, 2008 18:13

If its two cylinders next to each other ie 1and 2 or 3 and 4 ,then it could be that perticular carb one card serves 2 cylinders

Take top off the carb thats playing up make sure it has fuel in bowl ,then take jets out and clean them its easy to do

There will probably be a load of cr*p in the bottom of the bowl ,if there is do the same on the other carb to be on the safe side

Also if its post 85 check the fuel filter and bowl next to tank that will probably be the same if its not been touched in years

Failing that its the usual ignition system checks .Gettin the dizzy cap off is a pain ,but its far easyier with the airbox off

Mark

robatsea · Post by **robatsea** » Fri Mar 21, 2008 18:52

Thanks Mark, I will let you know how i get on.

Rob

locustx1 · Post by **locustx1** » Sat Mar 22, 2008 10:50

I had the same on my old Excel, It was two duff plugs that sparked when laying on the head but not under compression.

Brian