Recent content by gbwithacb

Oh, I'm scared to get stuck into it, I just don't want to face the disappointment of doing the shims and still having problems. This bike has fought me every step of the way, it hasn't been pleasant working on her so I'm at my wits end. Still, ONE MORE TASK! Let's do it! Thanks for your reply :)

Hello again everyone - so just a quick refresher: Got a stock CB750K, it runs but very rough. It had sat for a long time but looked like it had been prepped for long term storage. Backfires all the time, not rideable at all. There is no compression in the third cylinder. Low compression in the...

Well, shiiiiiiiiiiiiiiiiit.

Ok, got a new compression gauge, one that wasn't from the ol' Hazard Fraught. The readings are as follows: Cylinder 1: 100psi Cylinder 2: 100psi Cylinder 3: 0psi Cylinder 4: 110psi Do you think it's still burned valve covers? Is it possible that it could be a leak on the carb boots? I took...

Yeah I hear that! I'll take it on! Burnt valve means new shims, right?

Alright, so here is some goodish-badish news. I hooked her up to a car battery and ran the compression test again. I got pretty much the same results. Instead of 60 PSI on cylinders 1,2,4, I got 70 PSI. Cylinder 3 is at 0psi. Cylinder 3: I put a teaspoon of oil down the spark plug hole and...

Oh you sons of bitches, yes the cylinder head needs the engine to come off, but the cylinder head cover doesn't! Saved again by the FSM! I'll be ordering a micrometer and checking the valves when it arrives.

Haha, sage words right there. I know air cooled engines like to overheat quick, I had it on for less than a minute and was able to diagnose a problem. I'll double check tomorrow with the car battery and report back. Still convinced that something is up with the third cylinder Yeah the gauge...

Well, I'm at a crossroads with this bike. I replaced a headlight and figured I may as well let it idle for a few minutes. So, started it up, no problem. But I noticed that exhaust 4 and 2 were much warmer than 1 and 3. MUCH warmer. 3 was not warm at all. So I shut if off and figured that...

Yeah I know exactly which part of the carb you are talking about. I was only able to get to it on the first one. Luckily I knew not to dump then in carb cleaner. I didn't want to break em but a full clean is in order. Synching isn't cheap the first time. A synch kit costs $100.

Hahaha damn! I put in new plugs, the sound is gone. Look out folks, amc49 ain't messin' around. New pipes are in order, these things are just insane. :D

Hey thanks for your reply. Much appreciated. There are one or two things I'm not quite sure about: Yeah I'm a new mechanic, and the only other carb work I've done was on a single cylinder. Still, that one turned out absolutely perfect. I was pretty meticulous when cleaning these and not too...

Hello again everyone, I'm moving onto the next phase of restoring this motorcycle. When I bought it it was completely dead. Don't think it's been started since 1991. Well, I've fixed up some electric problems, cleaned out the carbs and I oiled up the cylinders before starting. It has the...

Hey just wanted to let you know that I finally got her running the other day! However, there is a new problem. I'm gonna look around here see if I can find an answer! Thanks for all your help

It's also possible that the battery I'm using isn't 100% charged. I don't have a battery charger, I just poured the acid into a battery and let it sit for a few hours.