Boosgarage
XS650 Member
1979 bs38. Carbs are clean, have spark, have compression, using k&n pod filters. Left cylinder not running just pops out the exhaust and carb boot. Any advice would be great.
-
Enjoy XS650.com? Consider making a donation to help support the site.
XS650.com receives a small share of sales from some links on this page, but direct donations have a much greater impact on keeping this site going.
Only running on one cylinder.
- Thread starter Boosgarage
- Start date
Boosgarage
XS650 Member
I have not. That will be my next step. It was running on both cylinders a couple days ago. It sat for one night then problem started. I'll check valve and timing, and update you thanks
If you stare at the points (located on the LH end of the camshaft), it is important to note that, to a certain extent, the two cylinders are timed independently.
By that I mean that the points for one cylinder are mounted on a points plate which can be advanced or retarded and that points plate is mounted on ANOTHER points plate for the other cylinder - and that plate can also be advanced or retarded.
Yeah - it sounds dumb for a 360 degree twin - but there ya go.
My advice is to get a test light or a multimeter with a buzzer setting and turn the engine slowly which connected to EACH set of points (one at a time) and watch/listen for the points to open while watching the timing marks on the crankshaft-mounted alternator rotor.
Pete
Last edited:
If it was me I would check the battery and charging Voltage
If that checks out I would watch how it looks at the Points if it is sparking at all the same way on both
I believe it is the Point having problems unless you are certain there is spark on both plugs
held against the cylinder head--- please do the read up how that is checked
If that checks out I would watch how it looks at the Points if it is sparking at all the same way on both
I believe it is the Point having problems unless you are certain there is spark on both plugs
held against the cylinder head--- please do the read up how that is checked
Boosgarage
XS650 Member
I got it running. It was my timing. Idles great no popping. Thanks for the help!!
Boosgarage
XS650 Member
Ok new update, sorry to mention I'm running Mike's xs charge pma system. I used a timing light and I'm dead on. Bike was running on two cylinders after I adjusted the timing. But now it's only running right cylinder. I cleaned the carbs again but nothing. It backfires out left carb manifold and tail pipe. I believe it's getting enough fuel because the plug is wet. Any advice would be appreciated thank you
Boosgarage
XS650 Member
Battery
What battery is it? Have you verified battery voltage as post#5? Have you verified the LH plug is firing at all by removing it, inserting in plug cap and grounding it to head while cranking?
Mr JP was faster but here is one input
If you have a Voltmeter measure across battery
everything off
and ignition on no running
and the same running -- even if only on one cylinder
How old is the battery ?
Boosgarage
XS650 Member
I'm not sure the difference between the two ignitions I'm sorry but it is a red xs charge ignition. And yes it has run right on this system
Boosgarage
XS650 Member
I will check that and update. Thanks
Boosgarage
XS650 Member
Yes I do.
Boosgarage
XS650 Member
Got 12.2 then ignition on got 12.0. Bike running 12.02
Boosgarage
XS650 Member
Yes got bright spark on both plugs
Similar threads
