Newb question about GRAMBO - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 05-23-2007, 05:35 PM Thread Starter
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Newb question about GRAMBO

I took my 86 for its first (at least in quite a few years) inspection and they told me the bike really needed a valve adjustment. They didn't give me a price. So, two questions...

I'd like to try the GRAMBO trick, but I'm not familiar with the "tensioner bolt" or how to find it. Any pics online of where this bolt is so I can try the trick?

If it comes down to it, how much is a reasonable price for a garage to charge for adjusting the valves?

This is my first bike, I've only had it a week or two, and have been trying to do whatever I can (in a limited budget and with limited mechanical skill) to get it running good. It was sitting a long time apparently, before I bought it. Any guidance on this grambo trick or tune-up prices would be appreciated.
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post #2 of 8 (permalink) Old 05-23-2007, 06:23 PM Thread Starter
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Doh, I posted too soon. I decided to just give it a try, and luckily think I could the right bolt. I gave it a try, and the noise in the front cylinder seems reduced. I still hear some moving parts in there, but not nearly as bad. Wooohooo! Praise be to grambo.

I also decided to do a "test" marble by removing the hose on the cylinder that is backfiring and covering it with tape & my finger. It seems to have helped. Tomorrow I'm gonna get a marble and try it. Getting closer to having this thing running okay...
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post #3 of 8 (permalink) Old 05-23-2007, 07:44 PM
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Do not literally use a marble!!!!!!! Find something, a copper cap, or, like me, a fitting that will fit securely in the hose or over the nipple. I just do not like the idea of someone putting a marble in the line. You never know.
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post #4 of 8 (permalink) Old 05-23-2007, 10:26 PM
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The marbles are a larger diameter than the intake - so short of the marble shattering, there's nothing wrong with using a marble.

Trust me - it's hard to shatter a marble (I tried when I was a kid... that's some thick glass).

I didn't like the look of the hoses and mine were pretty rotten - so I used vacuum caps. Some have also used 5/8? chair caps.

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post #5 of 8 (permalink) Old 05-24-2007, 07:08 PM Thread Starter
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I was thinking of trying a copper fitting, just to be safe. But once you cap the hoses, what do you do with the nipples on the cylinders? Just let it go as-is, or do you cap that too?

I was doing some looking around, and the hoses that go from the cylinders under the seat are pretty ratty. I might replace them altogether to see if it helps before marbling.

I was riding today and it sounded like I was doing a drive by while I drove down a long hill, so I definitely have to do SOMETHING.
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post #6 of 8 (permalink) Old 05-25-2007, 02:36 PM
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Somewhere they sell plates that go where the valve is that replaces the whole valve and cap the side of the head off flush. I can't remember where I've seen them though. Dianna would know.

Lots of us have used the marbles with great success. Don't fear the marble.

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post #7 of 8 (permalink) Old 05-25-2007, 07:07 PM Thread Starter
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I decided I wanted to try the copper fitting thing, but couldn't find any. So, I ended up buying 4 5/8 rubber chair legs. What I did was remove the hoses altogether, and put a stopped on each cylinder and also on the two nipples under the seat. There was also another big hose and a small hose on that thing under the seat, but I left them as-is.

Anyway, the backfiring didn't get any better. So I fiddled with the carb screws a little more. I found that 3 turns on the rear cylinder and about 1 1/2 on the front seemed to stop the backfire.

Problem is, now the bike seems to be running hot. The temperature was just slightly above the middle of the gauge. Not into the red, but a little above the tiny thermometer symbol. There was also a small amount of smoke coming out from behind the engine when I stopped. Could marbling cause it to overheat?
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post #8 of 8 (permalink) Old 05-25-2007, 07:48 PM
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Did you remove the valve from under the seat?
If so you need to plug the vacume line and the large line to the air box.

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