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Ok.. my bike is actually running really good right now, better than ever before. (thanks to all the good help on this thread!) But here's something strange that wasn't happening before. When i use my timing light on the right spark plug, there appears to be 2 white lines instead of 1. In other...

it's definitely the gas cap. i cleaned it out for now but i ordered a new one. thanks for all the help!

thanks. do you have any thoughts about the bike dying last night while riding? it rode perfectly all day and then struggled last night.

So, I went up a size on my pilot and mains, and i rode all day yesterday. It seems as though i'm still getting a bit of stumbling at lower rpm's and then it takes off at higher rpm's. It's not a lot of stumbling, but i'm wondering if i can fix this with a tweak on my mix screws? But then...

Thanks for the advice, i'm going to try out a couple bigger size jets. Will these bigger jets mean i'm getting more air into my mixture?

I'm a bit confused because the carb guide seems to say that my BS34 carbs have a main jet size of 132.5 and a pilot size of 42.5 ... but my yamaha service manual for xs 1978 - 83 says the main jet is 135 and the pilot jet is 27.5 (in the carb guide these are the specs for the 1979's) I...

Well, I hear your frustrations. i'm yet to find a good shop in Nashville that knows old bikes well.

I remember replacing the main jets last year sometime, but i can't remember if i went up a size. How can I tell? Will it say on the actual jet?

What do you think that means? The white line that is drawn on my alternator is somewhat faded, but i could see it fine at the Fire mark. Is it possible I wasn't aiming the gun at the right place? What are some other problems that could cause this?

Can I just pop those UNI filters on, or do i need to spray them with the filter oil stuff? i'm trying to read up on them. Also, will i have to re-jet the carbs? I just had my carbs cleaned.

Oh, I had one more question. When i was using the timing gun, the line stayed at the Fire mark while idling, and moved left to the Advance mark when accelerating, but then the line would disappear for a quick second after it reached the Advance mark, like the plug stopped firing. Then it would...

Ok.. here's the update. My power supply seemed to check out with the multimeter. Peaked around 14 volts like you said when revving. I then got my timing gun and dialed in the boyer, but after a quick test ride it was still bogging. I was curious about @DirtyErnie's question about my air filters...

Ok, thanks guys. I put the Hugh's PMA on my bike, so it's a little different than the stock set up, but I do have a sticker that marks the Fire, TDC, and Advance positions. So to be clear, while idling, the line should hover around the Fire mark, and then when I give it gas it should move left...

Ok, I got a timing gun. I've tried watching a few videos, but i'm still a bit confused on how to use it and what i'm looking for. I understand that i need to take the plates off to see my boyer ignition and the fly wheel to see the TDC mark. Then I shoot the light at the TDC mark while its...

I don't have a traditional battery. I have a tiny battery and a sparx capacitor that basically help the kick start. I was under the impression that the hugh's pma would give me the power I need without a battery. I already own a multimeter, but i'm not sure how to use it to check the voltage on...

I've got a 1983 with an electronic Boyer ignition, Hugh's PMA, and stock Bikuni bs34 carbs. I recently had a leakdown done and i've got 4% on the left, and 12% on the right. So, I know I won't be able to get her running perfectly, but I feel like I can still dial it in better than it is now. It...

Thanks for all the replies.. I was able to use the part # and find a new one. The one in the picture is still good, it's the other side of the bike that needs a new one. Thanks again.

thanks a lot, i'll check those out..

Awesome, thanks for the help. I'm still waiting on the new seals to come in. Do you happen to know where i can replace the O-rings that go back there? I can't find them on Mikes.

Im replacing the camshaft seals and i would also like to replace the 2 O-rings that go behind those plates. Does anyone know where i can find them? I can't seem to track them down at MikesXS.. It's the orange O-ring in the pic...