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82 550L Tuning Issues

  • Thread starter Thread starter itsniper1s1k
  • Start date Start date
I

itsniper1s1k

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I've been spending last month trying to this bike on the road. Picked it up cheap, but it's been more of a project than I thought. I like tinkering with it, but it's in my in-law's garage 25mi away :cry:. My wife and I share a car right now, so I REALLY want to get this thing on the road!

As background ... my first problem was that I couldn't get it above about 5K rpm. It would run up and then act like it was starving for fuel and drop to 2K. Cleaned through the carbs 3 times. The PO had put in all new jets (stock sizes as far as I could tell) so everything was pretty clean. Ended up that the intake boots were leaking so I replaced those and the o-rings. After that it was better, but still wouldn't go above about 8K rpm. Just finished adjusting the valves, but I ended up needing one more shim (#2 IN is still below spec).

Now it's running up to redline pretty well, though it still bogs down some once it's above 6K. My biggest concern though is that I can't seem to get it to idle. It's almost like it has two idle spots ... one at about 2K, and one at about 4K :?. If I rev it up to 5-6K for a second or two it will drop down and settle in at about 2K-ish and run for a minute or two, but then it will for no apparent reason climb up to 4K where it will sit forever. I messed with the idle screw at both spots and it seems to change idle at 2K, but not much when it's at 4K. However if I get it down in the 2K range and try adjusting the idle down below 2K, it just drops right off and dies. So it's like I'm stuck at 2K or 4K.

From reading a lot of posts on here it seems like "idle hunting" is a sign of a vacuum leak. But this afternoon I sprayed starter fluid (how I found the intake leak) all over the intakes and carb and nothing changed. Could this be caused by the one valve still being out of spec (gotta run to the shop and get another shim tomorrow so I can fix)? Or is maybe because the carbs need sync'd? What's weird is that before I adjusted the valves it would idle beautifully around 1.1-1.3K.

Oh, and I did mess around with the idle screws after adjusting the valves too. Started at 2 turns out and then backed them off until revs quit climbing (~2.75 turns out). Plugs still looked a little whitish (screws were ~1.75 out before), but I only had time to run it for 2-3 min after adjusting idle screws. And I had to keep babying it to keep the revs from running up to the 4K.
 
Hi Mr. itsniper1s1k,

The symptoms you describe make me think that you still have leaks in your intake system. Since you've replaced the carb boots and O-rings, how about sealing the airbox and checking the airbox boots? And if the carbs are the least bit crooked on the boots you'll get leaks. Good luck.

Thank you for your indulgence,

BassCliff
 
Yeah, I had thought of that too. If it's leaking some behind the carbs will that cause problems?? My airbox boots are not fitting up quite right. They're soft, but they don't want to stay on very well. It's like the bands won't slide up close enough to the carbs and they want to keep "squirting" off :-(. Maybe I should just order new ones and see if they stay on right. Oh and I'm running it with K&N filter and no cover on the airbox. Do I need to go ahead and put that on, or will the filter hold enough of a vac on the other side?
 
No airbox cover? The airbox-to-carb boots "squirting" off? I think you may have found your problem. Is your air filter properly oiled?


Thank you for your indulgence,

BassCliff
 
I've never worked with CV carbs before, so I didn't realize until reading some posts on here that you had to have vacuum on the back side of the carbs (I was originally just running them open on the back side). The whole air/carb system was tore apart when I got the bike, so I just dropped the brand-new filter in, hooked up the boots and didn't bother putting the cover back on yet. I do need to oil it yet before taking it out on the road ... but I guess that would affect air flow as well.

The boots are on, but I can only get them to stay about 1/2 way on, so they're probably leaking. I think I'll just order two new outside ones. They're angled to compensate for the angled air-box, but I think it's too much. Even when I shove them all the way on one side hits and the other side is over a 1/16 from being all the way on. If I turn the boot either it just gets worse, so I've got them turned right.
 
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