This bike is the 4 valve RFVC engine that was only built in 84-85. It has dual carbs.
I purchased this bike about five-six years ago and it’s the only dirt bike I’ve ever owned or drove. The only major repair I’ve done was the top cylinder head was rebuilt in 2012. Other than that it’s been minor things like replacing the throttle cable, chain guard, chain and of course the regular oil changes and air filter cleanings. I’m not the most mechanically inclined but I’ve been learning and have had my dad and brother help me with some of the more intimidating things to fix.
I’ve always had issues starting this bike after it’s been running and warm regardless of whether I turned it off with the kill switch or whether I stalled it. A friend mentioned it was likely the valve clearance levels so I recently checked and adjusted them as they were a little too loose. However, that didn’t seem to fix the issue and when I try and kick it over it sounds as though it’s not even trying to fire (video link below). After speaking with him further he suggested checking to see if there’s spark at the plug as it could be a coil, stator or a faulty kill switch.
Anyone have any suggestions? How difficult/expensive is it to test/replace the coil? I assume it’s different than the CDI?
As well, sometimes when I’m shifting gears it seems to almost get stuck and it just revs until I can finally get it to switch gears. What is likely the reasoning for this?
Here’s a video of me trying to start the bike after it’s been running and it’s still warm. It doesn’t seem to even want to fire.
Here’s a video of my bike from a few years ago. You may seem some ‘smoke’ coming off the engine but it was simply some cleaner smoking off that I got on the engine.
Any suggestions, guidance, comments or words of wisdom would be appreciated! Thanks in advance!