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Let's do it!

No rejetting needed, a re-sync is definitely needed though. AMC can chime in about the vacuum carbs not really needing any jetwork, just proper airflow.

Blinkers work, running lights work! Everyone should make the switch to LED flashers if they don't care about originality down to that caliber of detail. All it takes is an extra ground to the battery.

I wasn't trying to get rear running lights, I was trying to get the fronts to work again because they crapped out on me. Sorry if I didn't convey that properly. These bulbs are much smaller than the originals and not much brighter so the wattage isn't going to be greater if I use both...

Hey everyone, I decided it was time to get rid of the brick- sized blinkers on my bike, so I ordered a couple off of 4into1. I bought 4 3-wire turn signals. In the rear, i wired the two hot wires together to the single harness hot wire, and ground to ground. Testing the new rears while I...

So after stewing over my options for the winter, I have finally decided on a 4 into 1 exhaust. The pipe is a Vance and Hines model # 14001, and is meant for a 750F. After talking with AMC, I decided it should more-or-less fit the bike and expected it to need a bracket for the slip-on. As...

If it pulls like a 250, I'd hold your money and run.

I would say, solely based on knowledge of how "generations" of these bikes work, they're 95 percent similar. You should be able to spot any differences by looking at the manual and seeing a different part on your bike compared to the manual.

That's what I figured :laugh:

Thanks for the info AMC. That V&H sure does look nice. I still wonder who makes these pipes, even though they're going soon.

It's me again everyone! So now that my bike is running well, I'd like to change the exhaust that's on it currently. It's definitely not stock, as '79 K models came with 4-4 exhausts and this is a 4-2. It has no markings anywhere, and the end caps on the mufflers are solid sheet steel cups...

Try to seat those boots with a little PB blaster oil around the carb seats, they should slip over nicely.

It's all about perspective. Compared to what it was like when I had a dead cylinder, the response is night-and-day. But compare the working CVs on this bike to a FI bike and, once more, night-and-day difference. Lol

BIKE'S FIXED! Turns out that, a part which is supposed to restrict fuel flow, not existing in your carb, can cause a rich condition in your engine! Who woulda thunk it. Now the carbs need to get synced again, a fresh set of shoes put on, and maybe install those CBR600 F3 coils I bought on a...

Absolute first test is compression test to make sure you don't have a hole in your piston or a burned valve, the latter being a common problem on these bikes. After that I'm sure more people from the forum will chime in on how to help. It's a DOHC, right?

Ah ok. I thought the needle jet (collar) had a taper along with the needle. From google it seems that the top half of the jet is just wider than the bottom half. Either way, one claiming to be from a 79 750k from Ebay is in the mail and should be here Friday, so with my luck I'll probably get...

So as I said earlier, the lean problem had been solved by the mechanic, but cylinder 2 was still missing and has what I would say is a rich misfire. I pulled the carbs off again, and lo and behold, I'm missing a needle jet on none other than cylinder 2. I didn't notice that the first time I...

Ah ok. Good to know, but as of now the bike isn't flooding, so i do not suspect rust to be the culprit. Also since it's spitting out what I assume to be unburnt fuel, it must be getting airflow in that cylinder to bring fuel in, meaning my airbox isn't blocked anywhere.

Is that fine rust problematic? I feel like my mechanic would have picked that up when going through the carbs. Could my air filter be causing any issues? I found that a mouse or something had stuffed seeds in the folds at one point, but I blew them all out with compressed air before putting it...

UPDATE TIME! I had the bike over at the mechanic for a while, mainly due to the fact that I haven't had time to come get it from him. He has gone through the carbs and synced them as best he could. The lean problem is gone. But, while the bike runs better, the sputtering problem has not gone...

Woo thanks!! Good luck to everyone next month.

Valve springs are all good. The tank seems to be rust- free but I know that particles the human eye can't even see will clog up carbs. Mileage is 16,000 and change right now, it's possible a valve seal is bad. Right now my mechanic is going through the carbs to start, it's entirely possible...

Hey I'm up for it. My 79 K could use some stuff!

Also I did it using a car battery (car was off). The car didn't even notice it when I started it back up. Much better than stressing the puny motorcycle batteries!

Finally got around to borrowing another compression tester to use. I forget who makes it but it was a mechanic buddy's kit. It had two gauges in it, one for car engines and one labeled "small engine gauge". The large engine gauge would pump up to 75 psi in two cycles then stop moving at all...

Hey everyone, New 1979 CB750k owner here, and the bike is great but it definitely isn't perfect. The main issues I have noticed, after going through it to the best of my ability, are: -Three cylinders run lean based on looking at the plugs and seeing a white tip and no fuel residue on the...

Oh, and it has the side covers, I was just doing some tinkering!!

Hi everybody, New member here. I've been riding for as long as I can remember, and two summers ago I bought my first bike, a 93 Shadow 1100. Cruisers are great and all, but I felt the need for an I4, so here I am with my newly acquired 79 750K! I hope to learn a lot from everybody, as the...