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As TOMB told me overAnd over..And over…And over again…Change one thing at a time…I think I’d try lowering (less fuel) the needle a notch or two, and ride it to test the effect But the rest is Gap? Timing? Tappets? Tune up?Good luck! Let us know
Changing things one at a time is the right way to go of course.But before that, does the motor have good compression? Do a test.
I agree with the prior posts. Take your time and do a proper tune up and carb balance. I would also recommend replacement of the distributor springs. Your old ones are most likely stretched out.
Check the rubber seals on the bottom of the choke plungers, they can be pricked out and flipped over, if they leak , even a little, it'll be way rich, How are the spark plugs looking?
The slides from carbs looked very worn to me, but perhaps this is normal wear?[img]
That might be a good point with the springs. I have not disassembled or checked the points yet, but I was told that it had a service less than 500km's ago and I can see that some of the parts surrounding the distributor looks brand new. But I will look at the springs when I check the points.
It's hard to say without seeing how deep the scoring is, but I doubt this is the problem. Dave Richardson (in Guzziology) pointed out that the large flat sealing area of the VHB carb makes them much more resilient to scoring than round slides. If you wanted, you could sand the faces, I suggest. But I wouldn't bother.If you can isolate which cylinder is dropping out, the carb slides are extremely easy to switch side-to-side to see if the problem follows them.I'm eager to read what you find out when you get back to the problem.
Ahhh. OK, we got something here.. So has the bike ran this way since you got it? If so sounds like someone was chasing this issue, or caused it. Have you been into the dist yet? Being you know someone was in there, and replaced stuff, I would go in, and make sure they did it right. Are the points set right?, it the timing right? is the advance working as it should? Looks for other new changed components also. Is the coil new? Did they leave a loose wire, or forgot a ground? You have no idea who replaced those parts, or their skill level. Id would check that out first.
If the needles are worn then the jets are very likely to be too, especially the needle ones. I'd get new mains, atomisers ( needle jets ) and go from there.
If the jets/needles don't fix it, at least you will be going into this with a known stock baseline to tune from. As for all your charging/voltage issues. Have you gone through and cleaned all the wire connections, and grounds? Its a good thing to do on ALL old vehicles, and Guzzi's more so.
On your voltage readings…if the headlight was on, your pretty good. If the headlight was off your a bit low..there is an adjustable voltage reg available, but clean/scrape/smear your groundsOn the point gap…you found one of them on the narrower side and adjusted to spec…but later you suggested adjusting the point gap for better timing…bingo! That’s a common issue w dual plate points.On the change of jets…have you figured out if its an 850cc or 1000cc? Could be an issue Good luck! Don’t believe anything from 2000 miles away over the internet….
Rereading your post…are you snap opening all the way to WFO at 2500 rpm? That might be a bit of a challenge for a heavy flywheel Guzzi ..my fuel injection motor protests at that…Drop two gears, try that wfo thing while running 6k rpm.
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