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Old 04-27-2009, 07:23 AM   #2086
dannydoy 750
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i wouldnt be surprised if they put it back together wrong as it came from swaziland and as drbiged will tell you that is a bush mechanics paradise.
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Old 04-27-2009, 07:24 AM   #2087
morse
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Oh and!!! Is there enough coolant in your radiator
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Old 04-27-2009, 07:24 AM   #2088
dannydoy 750
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yip morse,thats exactly what i meant.

could it work like that??
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Old 04-27-2009, 07:25 AM   #2089
dannydoy 750
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mine or the bike radiator??
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Old 04-27-2009, 07:27 AM   #2090
morse
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Quote:
Originally Posted by dannydoy 750
yip morse,thats exactly what i meant.

could it work like that??
Yes no problem! I bypassed it finally this winter. Yours is bypassed alright because otherwise you couldn't engage the starter motor. That's related to the starter solenoid, it doesen't interfere to the work of the engine.
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Old 04-27-2009, 07:29 AM   #2091
morse
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Quote:
Originally Posted by dannydoy 750
mine or the bike radiator??
Both must be empty of beer or at least yours have to be relatively empty of beer to get it sorted out. Don't drink and drive!!!
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Old 04-27-2009, 07:31 AM   #2092
ppe172
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The decompression mechanism opens one of the exhaust valves slightly so that there is little compression. This is done so that the starter motor can build up some momentum before it has to overcome the resistance of a 750/800cc piston. When you pull in the lever it may or may not do anything since the mechanism only holds the valve open if the piston is at the appropriate place in the stroke. Once the crank starts to turn the decompression mechanism pops off so it only holds the valve open for a small portion of the initial starting sequence (if at all). Once the crank has started spinning the starter has built up enough momentum (probably thanks to the flywheel) and it doesn't need the deco help.

So can you start the bike without it? I haven't tried since my deco switch is functional but I'll guess that you can but that it will be very hard on your starter.

The no compression with the lever pulled in is normal. Just in case you don't know, you don't need to keep holding the compression lever in. Pull it in once, then let it go, then push the starter button. It won't start if you keep holding it because it will never make any compression.

If that doesn't work then check the compression using a gauge to make sure you haven't got bent valves etc. Also try checking the valve clearances, that can make a bike ahrd to satrt.
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Old 04-27-2009, 07:36 AM   #2093
dannydoy 750
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ok ok now im gettin the picture.

problem.....when i pull my deco lever and i swing the motor the lever doesnt pop back,it just stays in that position and the motor keeps turning with no compression.
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Old 04-27-2009, 07:37 AM   #2094
dannydoy 750
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with the deco lever out i have a huge amount of compression.could that be the problem????
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Old 04-27-2009, 07:47 AM   #2095
ppe172
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I don't think huge compression is a problem but if your deco mechanism doesn't pop off then that may be your problem. You need to check the deco mechanism adjustment and the valve adjustments to make sure everything is set up right. Was the bike running before? Did you buy it this way?
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Old 04-27-2009, 07:50 AM   #2096
dannydoy 750
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nope,i bought it this way.ive got the manual.will check the valve clearance and the deco clearance.why would the lever not pop back though.....needs to be oiled maybe?
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Old 04-27-2009, 07:51 AM   #2097
morse
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Quote:
Originally Posted by dannydoy 750
with the deco lever out i have a huge amount of compression.could that be the problem????
It's very possible. Try to pull the deco just a little bit so that you can give the starter a good momentum, as ppe said, and then release it. Or just find the reason why the lever doesn't pop up. Maybe the line. But the problem could be bypassed by not pulling the lever all the way...
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Old 04-27-2009, 07:51 AM   #2098
morse
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yes oil in the line might help also
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Old 04-27-2009, 07:53 AM   #2099
bluesman
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That sounds intriguing.
1. Check decompressor cable. Perhaps it simply sticking? Check that spring on decompressor lever is in place. This problem (deco lever not popping back when engine turns) not right. Unless you keep on holding it of course ;)
2. If you can turn engine easily with decompressor shut and it does not start - decompressor is not the problem. I would not recommend it to avoid killing starter, but it have nothinh to do with starting problem then.
3. You getting spark you mentioned - you sure carbs not blocked? Choke working?
4. Another possible cause of decompressor lever problem in fact is posibbly wrongly setup timing as been said or general cam-valves system troubles.

Are you sure you getting good fuel flow into engine? Did you try to take spark plugs off to see if they covered in petrol?
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Old 04-27-2009, 07:53 AM   #2100
morse
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Huge amount of compression is the reason why the front end of your bike doesn't seem to touch the ground anymore when you accelerate "mildly"
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