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Old 11-22-2010, 11:33 AM   #61
Jasper ST4
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Have you said that the engine turns freely with a wrench on the alternator bolt and spark plugs out?
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Old 11-22-2010, 12:01 PM   #62
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Yes, it does turn freely with the plugs out. Even with the plugs in I can kick it over with the kickstarter (feels like high compression), and I can even turn it over with the plugs in by hand with the alternator bolt (hard, but do-able)
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Old 11-22-2010, 02:01 PM   #63
68deluxe
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Quote:
Originally Posted by axis power
if you bought that bike for $2g's i think you did very well. i'd love to buy the stock turn signals and solo seat if you'll be selling them.
thanks

+1, I also think you got a good deal.
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Old 11-22-2010, 02:49 PM   #64
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Quote:
Originally Posted by 68deluxe
+1, I also think you got a good deal.
I read this entire thread and listened to your video. The engine sounds just like an engine that has timing way too far advanced. Easy way to check it would be to pull the spark plug wires, leaving the plugs installed and try to start the engine. If the engine spins freely, the timing is too far advanced. Of course maybe you already did that and I just missed that post!
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Old 11-23-2010, 12:04 AM   #65
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OK got an update!

I've got the bike cranking. and.....I'm kind of an idiot. haha
Turns out the slow cranking issue was............
........
.........
...........
..............

A bad ground.

I mentioned I did replace the battery cables (originals were corroded).
Well, I replaced them with car type battery cables. The hole in the ground terminal on the wire was slightly larger than the grounding bolt head on the back of the tranny. The lug wasn't centered correctly, and wasnt making a good contact. The fix was to sand down the mounting the bolt hole on the tranny, center the terminal and crank it down.

Even jumping the starter from the car battery with jumper cables didn't work, because using car-type jumper cables with saw teeth /\/\/\. This didn't make enough surface area contact grounding to the engine casing and possibly the slightly corroded outer surface of the case didn't help either.

So anyways, my starters good. And lesson learned, 100% triple check the simple stuff.

Now, moving on....I need to get this bike running.

I put the tank back on, checked for spark (strong), and let her crank. Nothing. I think I've got the carbs poorly adjusted after rebuilding them, and I'm going to go back and triple check timing. Any tips on getting these things running again starting from scratch after pulling the carbs apart?

I'll hit it again tomorrow and be back with an update.

Thanks to everybody for the help and tips on the cranking/starter issue, sorry for wasting time by overlooking something so simple!!!!!
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Old 11-23-2010, 03:46 AM   #66
Jasper ST4
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cough cough...

"Obviously the cables need to be making a solid connection with enough contact to handle the amps too."
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Old 11-23-2010, 05:28 AM   #67
Renner
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cool

pm'd
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Old 11-23-2010, 05:44 AM   #68
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Quote:
Originally Posted by Renner
cool

pm'd
Great news. Even if I was wrong.
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Old 11-24-2010, 12:48 PM   #69
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HUUUUUUUUUUUUUUUUUUUUUUUUGE Thanks to Renner!

He just left my house about 30min ago, and the bike is running like new!
150lbs compression both sides, starts in one crank and runs perfect.

Thanks again Renner, I can't thank you enough. I've got an Acewell speedo with your name on it whenever you're ready for the conversion.

Regrounded the starter well, it's spinning fine for a couple cranks. It will still slow down after turning over a couple times (probably bad bushings I suppose in the starter? not sure at this point). But the bike fires up on the first revolution.

We synced and balanced the carbs and adjusted them. It sounds great.

No starting issue was due to me setting the timing incorrectly...WAY too far advanced to ever start. I really can be an idiot sometimes, get frustrated and just overlook simple stuff.

Anyways, THANKS AGAIN Renner, so glad to have it running.
I'll post up some pics tonight. I'm buttoning the bike back up, finishing wiring for the HID headlight, etc. She'll be on the road this afternoon!
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Old 11-24-2010, 01:20 PM   #70
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Old 11-24-2010, 07:03 PM   #71
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Still working on the bike :)
Almost everything is back together.
Had to cut apart, widen and weld up the battery tray to fit my new battery, and the original tray was super corroded from the old battery leaking acid everywhere. Putting my welding skills to the test haha.

So I'm postponing my first ride to tomorrow morning.

Pics coming tomorrow !
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Old 11-25-2010, 02:42 PM   #72
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OK, got the bike back together finally. Was working on it til 2am.
Took all morning to finish it up.

Took it for a spin, all was well. Got back to change the oil after 10 min riding.
After doing so, I started it up again, and after it warms up, I'm getting this horrible chirping noise. (not saying this is oil change related, but it was the last thing I did)

It sounds like this is coming from the rear of the engine, in the transmission area.

Here's a video of the sound. Skip to the end (around 1:00 min in) as it gets louder:



Any ideas?
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Old 11-25-2010, 02:55 PM   #73
Jasper ST4
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It's Thanksgiving. It's gobbling! I don't really know, a faulty breather can make some noise but that's louder than what I think it would be.
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Old 11-25-2010, 03:34 PM   #74
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Quote:
Originally Posted by Jasper ST4
It's Thanksgiving. It's gobbling!


That sounds like a breather to me. You may have the older round disc breather and not the later reed valve type.

Relatively straightforward (pull the air cleaner, starter cover and then you can access the breather).
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Old 11-25-2010, 04:55 PM   #75
Renner
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No worries. simply one of the joys of airhead ownership.
Very likely either:
1) crankcase breather or
2) rear main seal
do you enjoy reading?
http://bmwmotorcycletech.info/oilingsystem.htm
http://bmwmotorcycletech.info/flywhe...valwarning.htm
I guess #2.
have a party and change both
aren't old bikes fun

how was the ride?
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