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Old 07-26-2012, 06:28 PM
Nick7777 Nick7777 is offline
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starting trouble...

so i just finished putting a replacement head on my bike, and she turns over but doesn't start. start button wasn't working so i hooked the bike up to a car battery(car wasn't running) and the start button worked and the bike cranks vigorusly. has fuel, pulled the plugs out and all of them have a good spark. any suggestions, i'm going to do a compression test, but any and all input would be helpful. as this is my first motorcycle build i'm not the most eduacted with bikes, but am very mechanically inclined as i do all my auto repairs, and have rebuilt engines so i'm not clueless. thanks in advance.
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Old 07-26-2012, 06:48 PM
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Nick, if your sure you've got fuel and spark the only other thing required is compression.

Are you sure you have the cam timing right? Don't mess up that good head.
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Old 07-26-2012, 06:52 PM
Nick7777 Nick7777 is offline
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yeah greg the timing is dead nuts. i rotated the cam about ten or fifteen rotations (clockwise) and the timing marks hadn't changed. i am wondering if perhaps valve shimming may be the culprate. would this give a no-start condition
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Old 07-26-2012, 06:56 PM
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How were your clearances when you checked them? Did you set the valves before you installed?
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Old 07-26-2012, 06:59 PM
Nick7777 Nick7777 is offline
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set the valves, please explain
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Old 07-26-2012, 07:00 PM
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I would do the compression test first as you have just replaced the head. It takes only a small mistake to get valve timing wrong and bend up some valves.
As you have fuel and spark the only things missing are air, compression and timing. Did you by any chance have any of the ignition system apart. On occasion members have hooked the coils up backwards and while they have spark it is at the wrong time for the motor. 2 and 3 fire when 1 and 4 are supposed to be sort of thing. That is just a thought.
Is it firing at all or even backfiring or any other associated noises?
Is there any chance that an electrical issue may be happening like an emergency kill switch still on or a tipover switch installed upside down kind of thing.
Just some thoughts to get us going here. As BA80 says make sure about the cam timing and chain tension and all that good stuff.
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Old 07-26-2012, 07:03 PM
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Quote:
Originally Posted by Nick7777 View Post
set the valves, please explain
You DID shim them to the proper clearances. http://www.xs11.com/forum/showthread.php?t=35434
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80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

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Old 07-26-2012, 07:10 PM
mikubuilder mikubuilder is offline
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you need to define "doesn't start..."

does it mean that it does not fire up? is it coughing and sneezing?

did you pull the plugs and are they went from fuel?
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Old 07-27-2012, 03:30 AM
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If you replaced the head, did you also remove the coils for clearance? Did you perhaps swap the wires from the coils? Did you make sure you put the plug wires on the correct plugs? Yeah I know your not stupid, I just have found its typically the simple stuff that causes these problems.
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Old 07-31-2012, 02:34 PM
Nick7777 Nick7777 is offline
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Update

well i went back through the cams, and re-shimmed everything so numbers are without a doubt in tolerance... and i did a compression test, but beings how it is not starting(does crank over) not sure the results are the best. here they ar:
Cyl. 1= 100
Cyl 2= 100
Cyl 3= less than 10
cyl 4= 100
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Old 07-31-2012, 03:02 PM
Nick7777 Nick7777 is offline
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if it's not a cheap fix i'm parting ways with her... she has been a nightmare and maybe i'll go cram it up the PO's rearend for the crapshoot he sold me.
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Old 07-31-2012, 03:08 PM
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Put a table spoon or so of oil in the bad cylinder and redo the test on that one. If the compression comes up then its the rings that are not seating or a hole in the piston. If it doesn't come up then it is in the valves, and I am betting on a valve being f'ed up or not shimmed right.

how did you do the shims? What size shims do you have in there?
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Old 07-31-2012, 03:15 PM
Nick7777 Nick7777 is offline
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yeah i am heading out to do a wet test now, valves are all shimmed up coreectly, they were a little out of spec initaially, but i can't imagine enough to bend them ill re-post in a few
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Old 07-31-2012, 03:20 PM
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Did you have any compression numbers on that cylinder before the rebuild?

When I first got my SG, I didn't know it, but #3 had a ever so slightly bent exhaust valve. You wouldn't have known it except the compression number was way low, so then I pulled the head and saw a half moon shaft of light thru the exhaust port.
Got a new valve for $26 and everything is good now.

Edit: just re-read the initial post. It's a replacement head. Before you put it on, did it look like all the valves seated good?
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Old 07-31-2012, 03:20 PM
Nick7777 Nick7777 is offline
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no change, and the piston has no holes, had the head off recently. on to parting it out...
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