Hi All
Just spent a few days getting the SR ready for its MOT. Over the winter I have fitted western bars and longer cables, craven rack and panniers. Also fitted new BAP taps from SRM as the rubbers in the old ones had disintegrated and were causing fuel starvation and I had to run with both taps open.
Today I took the oil tank off and flushed it out, refitted it and filled up with new oil and took it outside and fired it up. It started ok - well as ok as it usually does and I let it warm up for a while. When it was warm I noticed that I get a spit back through the carb when I blip the throttle which it did not do before ? only when cold.
I did not use the choke to start up as I have never found it necessary, and using the choke while running had no effect on the spit back.
Another thing it was doing was backfiring on one side when I retarded the ignition. Before it just used to miss and run on one when I retarded it and is something I have been trying to fix over the past year and has been doing it since I bought it.
Took it back in the workshop and took the plugs out and they were both sooted up right down the bottom of the central electrodes.
Took the leads off and the next step was to clean the mag slip ring with a clean bit of rag in case the spark is tracking round it and firing one cylinder on the inlet stroke causing the spit back and possibly also causing the backfire.
Just came in for a coffee so I thought I would consult the oracle for ideas before going any further.
My first thoughts with the carb spit back are a sticky inlet valve as the engine was rebuilt about 500 miles ago and they may still be a bit tight. Also I may have to bite the bullet and get the mag reconned but wanted to eliminate all other possibilities first.
Any thoughts?
Jim