bike difference

Dave Daniels dwaynedaniels at
Fri Mar 16 06:56:29 PDT 2007

I'm pretty sure it's all hooked up correctly. The only thing I was unsure about was where the two vacuum hoses coming from the vacuum switch valve go. But, the diagram in the manual show them going to carbs 1 and 4, so that's where I put them. I'll go over the whole thing again and make sure there's no leaks. Maybe there's something wrong with the switch valve.

David Beard <davidebeard at> wrote:  Also, you might mention that the carbs have the stock jets and needles 
in them, so there should not be a "jetting" problem. The bike has the 
stock airbox with silencer and stock exhaust, so the stock jets should 
be right. I'm personally thinking there has got to be a vacuum leak 
somewhere or maybe something is hooked up incorrectly. Sounded like it 
was all right when I talked to you on the phone, though.

Dave B

Dave Daniels wrote:
> Well, I guess I should have included a little more info in my email last night so you guys have a better understanding of what's going on. The emissions equipment on top of the valve cover, i.e. the two hoses coming out of the top that go into the vacuum switch valve, along with the big hose that goes from the switch valve into the top of the airbox, and the two little vacuum hoses that go to the carbs (whew, that was a mouthful) were all missing on the old engine. Somebody just took the two hoses out of the engine and plugged the holes with pipe plugs. The vacuum ports on the carbs were all plugged off except the one going to the petcock and the big hole in the top of the air box was left open. So, the carbs were tuned for that setup and most likely isn't getting enough air in the fuel mixture now. At least that's my guess. When I got the new engine, it had the two hoses coming out of the top of the engine, but the vacuum switch valve was not there. So, I found one, along
> with all the hoses on ebay and put it all on the new engine. So, I'm figuring I just have to retune the carbs for this stock setup. So you know, the old engine ran quite well, except for the low end problems so I'm sure there's nothing wrong with the jets. So, I guess I'll have to start from scratch trying to tune the carbs. I have no idea where the mixture screws are set currently. Not looking forward to this, since it's just so dang subjective. Oh well, at least I know it'll run.

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