Topic: 1972 K1 carb setting?

[slowjo]

I started my bike last week for the first time since last year when I put it away for winter and gas just poured out from one of the overflow lines on the carbs. It has always ran really rich since I got it about four years ago. So I finally  decided to pull the carbs and clean them right following closely to hondamans book. My question is should I move the clip on the needle while I have them apart or should I just clean everything and put it back the way it was? 

[Gordon]

One change at a time, IMO.  In this case, the thorough cleaning is one change, and may be all that's needed.   

[slowjo]

That's what I'm thinking. I did not want to pull them till next year and clean them. It was 82 here in Ohio last week and now chance of snow in the morning. Its been raining on and off all day. So its not that bad having the bike down.  I'm cleaning them one at a time so not to get things mixed up. Once I pulled the apart it all started to make sense, and its not as hard as I thought it was going to be.

[Gordon]

The carbs are only intimidating until you clean out the first set, as you figured out. 

As for the overflowing carb issue, chances are it was just a sticking float caused by sitting for so long.  My K1 will leak the first time I turn on the gas if I let it sit for more than a couple of weeks, or if I let the bowls run completely dry.  Tapping on the offending float bowl with a screwdriver handle always takes care of it.  My last day off I pulled the carbs and polished the float hinge pins to a mirror finish.  Hopefully that will keep them from sticking in the future. 

Near sea level, jetting and needle clip changes shouldn't be necessary on an otherwise stock bike.  Does your K1 have any non-stock intake or exhaust components?

[aussie cb750 k1]

Just a quick question....'72/K1,what gives? 1972 is the start of the 341 Series K2's I thought.I might stand corrected on this but I think I'm right.

[Gordon]

Just a quick question....'72/K1,what gives? 1972 is the start of the 341 Series K2's I thought.I might stand corrected on this but I think I'm right.

The only thing that matters is the VIN.  Many bikes back then were titled as the year sold, so if a K1 sat at the dealer for a while it could have been titled a '72 or even later. 

[slowjo]

The bike vin is 6/71 but the title says 1972. It has a lot of the pre 1972 parts. I did change the exhaust to a mac 4 into 1. Other than that its all stock.

[aussie cb750 k1]

If the VIN says 6/71 then it's a K1-no doubt at all.The year on the title means nothing.No wonder it's got a lot of pre '72 stuff on it.Check the barrels on the engine.If it dosen't show a central piller directly in the middle of the barrel as viewed from either left or right,then it's definately a K1.the idiot lights between the handlebar clamps is another sure fire K2 givaway.The idiot lights on a genuine K1 are in the instruments.