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Old 03-21-2007, 07:19 AM   #16
jdiaz
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Quote:
Originally Posted by AntonLargiader
Valves float and the oil pump cavitates (about 8200 RPM I think).
Whoa! 8200 is way up there for an old bike.

I'll be interested to see if a charging problem develops this year. The guy who passed the info to me is normally spot-on.
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Old 03-21-2007, 07:28 AM   #17
AntonLargiader
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I'm not saying your guy is wrong; I'm just adding these restrictions in also. But I think plenty of Airhead racers are running stock charging systems close to 8k.

I wish I had a tach with a telltale so I knew what RPM I hit when I knocked the shifter into first when I was redlined in second at BeaveRun. That one cost me a valve, and knocked the guide right out of the head.
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Old 03-21-2007, 07:35 AM   #18
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Quote:
Originally Posted by AntonLargiader
I'm not saying your guy is wrong; I'm just adding these restrictions in also. But I think plenty of Airhead racers are running stock charging systems close to 8k.
Really? I would think the first thing you would do on a dedicated Airhead racebike is to yank the rotor and stator and run total loss just to minimize rotating mass from the crank. Does anyone do that?
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Old 03-21-2007, 07:38 AM   #19
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Oh yeah. Mine is total loss, and so are a number of others. But I don't think all of them are.
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Old 03-21-2007, 07:42 AM   #20
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Originally Posted by AntonLargiader
Oh yeah. Mine is total loss, and so are a number of others. But I don't think all of them are.
Does it pick up revs a lot more quickly? What else did you and Cutter do to your bike?
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Old 03-21-2007, 07:55 AM   #21
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It's all here: http://www.largiader.com/slash5/

Still gotta fix that cylinder head, and get a lighter exhaust, make a race seat, maybe hack the subframe, bump the compression, dual-plug it, install better gearing, and loads more.
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Old 03-21-2007, 08:15 AM   #22
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Did a dog pee on your front tire in this pic?

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Old 03-21-2007, 01:51 PM   #23
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Quote:
Originally Posted by AntonLargiader
Maybe I misunderstood what you wrote. Did you indicate that you had a persistent loss in performance until you got home and adjusted the valves, or just that power was off while you were over 8000 RPM?
The bike had a persistent loss of power until I got home and adjusted the valves. But at the same time I adjusted the valves I got rid of that mix of OK and old gas - I live close enough to the on-ramp that there's an outside possibility that i didn't pull the bad gas into my carbs until about that same time.

And I've never had head work done on the bike. It was down for a swing-arm issue. I never had the motor apart.
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Old 03-21-2007, 02:17 PM   #24
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Well I hope it all works out.

Meanwhile, who are the smiley designers around here? I was looking for a "blow sunshine up his ass" smiley and couldn't find one.
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Old 03-22-2007, 07:28 PM   #25
IrishFazerBoy
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Ride more, worry less. The bike runs fine, thank the m/c gods, go have fun...spring is here

BTW while not recommended, 8K for a minute or so, will not kill your engine.
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Old 03-23-2007, 12:22 AM   #26
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I'd think if you bent a valve it would idle pretty rough. Since you didn't mention that, I'm assuming not. Explain what you mean by 'running poorly'. No power or acceleration could have been caused by both sides bending valves, I guess.

You could do a compression test - that's an easy ten minute job. Doesn't everyone have a compression tester? If not, go to a used tool store and get one for a few bucks.

That will tell you whether compression is good or not.

Now might be a good time to find out how Burt Munro (worlds fastest Indian) straightened his when they got bent.
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Old 03-23-2007, 05:22 AM   #27
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soooooooooooo.....

it's working ok now?
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Old 03-23-2007, 09:33 AM   #28
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Originally Posted by datchew
soooooooooooo.....
it's working ok now?
It seems to be OK. I'm running it for 300 mi (1 tank of gas) and then I'm going to check the valves again. Depending on drift/direction I think i'll know. And I'm going to get a compression tester this weekend.
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Old 03-23-2007, 09:40 AM   #29
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Quote:
Originally Posted by homerj
It seems to be OK. I'm running it for 300 mi (1 tank of gas) and then I'm going to check the valves again. Depending on drift/direction I think i'll know. And I'm going to get a compression tester this weekend.

I want to bet you had some crappy gas.


Here's to hoping thats all it was.
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