onesea Posted March 15, 2021 Share Posted March 15, 2021 (edited) Ok so I have replaced the loom on my bike... All works... Except cylinder no 3, gut feeling is it's the carb. However I think I should start by checking the new to me loom. Can I use multi meter to see if I get a signal to the coil? Can I switch cylinders 2&3 to see if fault moves? Yes there is fuel in bowl. No I have not yet look at plug.. to do that I have to access coil so was going to go step by step.. removing carbs is a work up I would rather avoid until I know electric side is good... Edited March 15, 2021 by onesea Quote Link to comment Share on other sites More sharing options...
Stu Posted March 15, 2021 Share Posted March 15, 2021 Got any carb cleaner? or something similar that flammable? give it a quirt in to number 3 and if its fuel related then it will fire that cylinder up confirming if you have a spark Quote Link to comment Share on other sites More sharing options...
linuxrob Posted March 15, 2021 Share Posted March 15, 2021 take it that each plug has it's own coil pack? Quote Link to comment Share on other sites More sharing options...
onesea Posted March 15, 2021 Author Share Posted March 15, 2021 @Stu thanks for suggestion to spray into one carb I have to take half of bike apart... By the time I have rebuilt anything flammable will of evaporated.. @linuxrob 2 coil packs 4 cylinders... Photo shows back of 1 coil pack. 1 Quote Link to comment Share on other sites More sharing options...
Stu Posted March 15, 2021 Share Posted March 15, 2021 Well in that case then swap the plug caps and see if it moves the coils will fire in pairs and always have a wasted spark on a plug so swapping them should make no difference Although once you have the bike apart you could get it running without the airbox on and squirt some carb cleaner in Quote Link to comment Share on other sites More sharing options...
onesea Posted March 15, 2021 Author Share Posted March 15, 2021 4 minutes ago, Stu said: Although once you have the bike apart you could get it running without the airbox on and squirt some carb cleaner in Your funny to remove the Airbox I have to remove the carbs... Triumph English engineering.. Quote Link to comment Share on other sites More sharing options...
Stu Posted March 15, 2021 Share Posted March 15, 2021 6 minutes ago, onesea said: Your funny to remove the Airbox I have to remove the carbs... Triumph English engineering.. OH!! maybe stick to plan B then Quote Link to comment Share on other sites More sharing options...
onesea Posted March 15, 2021 Author Share Posted March 15, 2021 43 minutes ago, Stu said: OH!! maybe stick to plan B then As in it. Had the old heart in mouth moment today must remember that carb bowl screw drains directly on to the hot exhaust 2 Quote Link to comment Share on other sites More sharing options...
onesea Posted March 16, 2021 Author Share Posted March 16, 2021 Tried her today, found what I think is the cause, split vacuum hose. She started running on all 4 cylinders, I switched 3&4 no change. the vacuum hose has long been gremlin on trophies will start a new thread for suggestions on my solution... 1 Quote Link to comment Share on other sites More sharing options...
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