Just want to share my experience when my right hand cylinder began misfiring.
Went out yesterday after about a mile bike felt down on power and was making that funny sound when I cracked the throttle. Bike wouldn't idle. Did the licked finger test on the downpipes right one was lukewarm. Went back home changed plug no change. Did the unscrew plug cap and nip off the end of HT lead thing. On test ride seemed okay to start but then began spluttering. Checked timing with strobe light which confirmed coils were firing okay.
Plug was wet so fuel was getting through so removed choke piston from right carb found that it had stuck mid bore and was therefore flooding cylinder and killing the spark. Gave the choke piston a quick clean with carb cleaner a smidgen of grease and problem solved bike restored to full power!
550 J cylinder misfire solved
-
- Posts: 3120
- Joined: Wed Sep 26, 2012 7:33 pm
- Location: Prestatyn.Wales
550 J cylinder misfire solved
Last edited by barney01 on Wed Oct 03, 2018 9:28 am, edited 1 time in total.
NO SMOKE .......NO POKE
- JOHNJENKS66
- Posts: 1263
- Joined: Mon Apr 11, 2011 8:38 pm
- Location: Cork City Ireland
Re: 550 J cylinder misfire solved
Good save Barney, and a cheap fix too
what the fuck was that ????
If you can read this, thank a Teacher.. If you are reading this in English, then thank our Soldiers..
If you can read this, thank a Teacher.. If you are reading this in English, then thank our Soldiers..
-
- Posts: 3693
- Joined: Wed Jul 20, 2011 3:40 am
- Location: Sydney NSW Australia
Re: 550 J cylinder misfire solved
Just read your PM Barney, good you fixed the problem
Cheers.
Roger
GT750A.
Roger
GT750A.
-
- Posts: 1035
- Joined: Mon Mar 07, 2011 8:10 pm
- Location: Chicago
Re: 550 J cylinder misfire solved
Good catch. Another thing to check on our old bikes is to see if the choke plunger is sealing. I have found quite a few that go down and appear to seat but still leak past the hardened rubber insert. A MityVac or similar is an easy tool to use to check for leaks
- Alan H
- Posts: 12116
- Joined: Fri Aug 05, 2011 6:38 am
- Location: Wombwell, Republic of South Yorkshire
Re: 550 J cylinder misfire solved
I had exactly the same back in about 1974 with my 550J. Started well and 'lost' a cylinder after a few seconds as the engine got warm. A bit of tarnishing in the choke plunger tube was soon cleaned and ran fine afterwards. I don't think it would happen on a linked carb set up as they have solid connections, where the separate carbs have individual cables of course.
Proof that four strokes are over complicated