So I started a new job and my free time is somewhat reduced. In the last weeks I have done some testing and found out new things. I'm still not there yet and hope really hope to get the bike running asap. Its really annoying that summer is moving along and I cannot seem to find what is wrong with the bike.
A quick recap of what me and a buddy tested on the bike:
No major modifications were done to the bike since the last time. I did go back to wire according to my original diagram, and tested mainly with the Carmo ignition. We tested a bunch with the timing light. Paying more attention to this than before. We noticed the timing light would flash double on one cylinder. And we would see occasional break ups in the flashes on both cylinders. The RHS cylinder would not run smooth (some popping in the exhaust and felt way colder than the LHS).
We flipped the spark plug leads and the speed of flashes would change with this. however the RHS would still be cold and and show intermittent flashing. At this point the focus shifted for electrically to
fuel related.
At this point I double checked the base settings of the bike to make sure this was not chasing my tail. Cam chain was on the loose side, fixed that. The valves were sort of ok but I reset them perfectly. I checked for compression: left & right around 138psi. I checked the float height with a clear tube: pretty equal and just under the top of the bowl. I removed the carbs to clean, did not find and clear debris or whatever. Did see that the RHS butterfly was almost shut. So by eye a made it equal to the LHS. I fitted new intake rubbers because one of the vacuum barbs came out while trying to synchronize with a manometer.
At this point the bike ran way, and I mean way smoother at idle!! I'm feeling like the sync was way off and maybe causing this.
Next I did a sync with the manometer tube. By eye I wasn't that far of. Next I did a few testrides, they went pretty good! I rode for max 1h and noticed the bike runs best when cold. Could run it all the way up to 7,5k without to much effort. After fully warming up it would start to pop in the exhaust on the left at idle. And it would kinda sputter if I came to a near standstill and wanted to accelerate.
Next step was setting the Mix screws. I have red the carb guide at least a dozen of times by now, but i have never had real luck with setting them properly. I wanted to do the dead cylinder method to set them. This is where I am now and running into the following. Both mix screws are at 3 turns open (btw i have stock CV34 carbs). I want to have the bike run on one cylinder. I cannot run the bike on one cylinder with the R/R hooked up. So for testing I would just unhook it. I can run the bike on the RHS cylinder only without to much effort. But I cant run it on the LHS cylinder only.... even raising the idle with the butterfly stop screw. So I figured maybe my pilot jet setting is wrong? Instead of messing with the hard to reach pilot jets I tried some different air jets. Going smaller from 127,5 to 118 would make the bike also run on just the left cylinder. So i changed them both to 118 making the setting richer. Trying to set the mix screws with that, I came to 3,25 tuns and 3,5 turns for the other. But I have to say I find this method kinda hard. because I dont really notice a lot of change turning the mix screws.
Did a mini testrun with the R/R still unhooked. Ran OK-ish. Feels similar to the bigger air jets. Still pops in the exhaust on the left cylinder at idle. but if I let it run on just that left cylinder, it doesn't pop
. Finally, hooking up the R/R again the bike runs rough at idle.
So to recap: I don't know if i still have an electrical issue. The bike seems to charge perfectly, only with this last test it seems that the R/R plugged in or out makes a difference. And i was able to run it from 1k to 7,5k. I do think i have to work on the fuelling of the bike. I find it weird that before the sync the right cylinder would pop in the exhaust and now after setting the sync its the left.
what do you guys think? (is this long post even understandable?
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