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Old 02-03-2014, 06:59 AM   #16
H96669
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You had a very leaky head gasket? Did you check to see if the head was flat?
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Old 02-03-2014, 08:29 AM   #17
jtworldwide2
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Originally Posted by AustinJake View Post
In this video, it doesn't sound like there is any compression
Agreed.
have you tried watching the valves move with a pencil in the cylinder bore to make sure you have the cam timing right?
That motor sounds like the valves are being held open all the time.
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Old 02-03-2014, 08:41 AM   #18
AustinJake
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Originally Posted by jtworldwide2 View Post
Agreed.
have you tried watching the valves move with a pencil in the cylinder bore to make sure you have the cam timing right?
That motor sounds like the valves are being held open all the time.
Or, they are being held open at the wrong time and bleeding off compression, and compression is a vital part of running, just like gas, air and spark, ya gotta have compression or there's no POP.
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Old 02-03-2014, 08:58 AM   #19
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Wow you've done soooo much that it could be sooooooo many things.

You need:
1) fuel, you seem to have that. But you messed with the carbs so it could be maladjusted, but should still fire.
2) spark, you seem to have that.
3) compression, you had it when you took it apart... you should have it now, but check.
4) correct timing, (of #2 & #3 above) you had better check that again, or have someone that knows check it.
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Old 02-03-2014, 04:32 PM   #20
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Be a bit careful here, it's quite hard to steer a bike that's running backwards.

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Old 02-03-2014, 05:52 PM   #21
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Originally Posted by sieg View Post

Wow you've done soooo much that it could be sooooooo many things.

You need:
1) fuel, you seem to have that. But you messed with the carbs so it could be maladjusted, but should still fire.
2) spark, you seem to have that.
3) compression, you had it when you took it apart... you should have it now, but check.
4) correct timing, (of #2 & #3 above) you had better check that again, or have someone that knows check it.
5) A shop manual
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Old 02-03-2014, 06:00 PM   #22
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Originally Posted by H96669 View Post
You had a very leaky head gasket? Did you check to see if the head was flat?
I had a shop check the flatness: heres to hoping they did it well.

I have a factory manual. It has been great.

And to a majority of others: I'm hopefully checking compression tomorrow. Waiting for the tester to come in.

To all: thanks for all the suggestions.

tyreybel screwed with this post 02-03-2014 at 07:02 PM
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Old 02-04-2014, 07:56 AM   #23
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Good on you for bringing an old bike back to life. You are so close to having a runner I think.


If the timing is off you can usually hear air coming back throughout the carb or feel that no pumping/pulsing air is coming through the exhaust.

A quick test for compression is to put your thumb over the spark plug hole, if there is enough pop to blow air past your thumb while holding it down, you should have enough compression to fire.

Lastly, are these fresh new plugs? Big bright spark?

MIL's snow blower wouldn't start. I checked everything and the plug sparked. Eventually I swapped the plug for a new one and it fired right up.
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Old 02-08-2014, 04:23 AM   #24
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Compression Test

Got the compression tester adapters in, with a new compression tester. Used both my old tester with the new adapters, as well as the new one. No compression whatsoever. I could feel a little with my finger over the spark plug whole, but it's not enough to get the dial to read ANYTHING.

I can only imagine my cam timing being off. Unfortunately I don't know why, as I followed the factory manual guidance for cams, as well as this detailed profiling found here: http://home.comcast.net/~loudgpz/GPZ...550500400.html

Anyway. I'm going to recheck everything. Let me know if anyone has a thought on why I am getting such low compression/how my valves could be staying open other than a cam timing.

-Tyler
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Old 02-08-2014, 06:45 AM   #25
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When you installed the cams and turned the engine over by hand was there any resistance? Hopefully if it's cam timing no damage was done. Proceed slowly from here to minimize/avoid any damage to the valve train.
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Old 02-08-2014, 06:47 AM   #26
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Did you remove the sprockets from the cams ? Could be a gotcha there, or cams could be installed in the wrong location. I have seen both....

Perhaps a leak down test before you disassemble but no compression on any cylinder looks like a cam/valve problem.


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Old 02-08-2014, 09:33 AM   #27
H96669
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Well you had new valve seals installed and hopefully they checked that the head was flat. Where the valves cleaned,inspected,lapped or even checked for leaks before the head was reinstalled????

Pretty easy to do a leak test on valves when you have the head on the bench. A little bit of gasoline and see if it seeps out.
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Old 02-08-2014, 03:49 PM   #28
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I did feel some resistance when I turned it by hand initially, but that was because the timing was off. So I re-checked the timing, corrected it, and the engine turned over smooth afterwards. I didn't put much pressure on it when I felt the resistance, knowing I could bend the valves if I did. So I hope it's not that.

As far as the sprockets go: I didn't disassemble any part of the cams. Just lifted them off with lobes in place and set everything aside. I made sure not to drop or damage them in any way, so I don't think it's that.

And concerning the shop, I unfortunately can't speak for them completely but I do know they lapped the valves and checked for evenness. Not sure if they checked for leaks. Maybe I will head back and ask them if I can't get the compression to come back.

Thanks as always.
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Old 02-08-2014, 04:34 PM   #29
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You only need 4 things to run: spark, gas, compression & timing
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Old 02-08-2014, 06:12 PM   #30
H96669
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Sounds like the shop knew what they were doing as far as working on valves. So probably not it, if they were good enough to do a lapping job I'd think they knew enough to check their work.

I guess next would be to do the compression tests with oil in the cylinders and see if you have "some" compression. That may tell if the rings are stuck and they may be from running with a leaky head gasket/carbon accumulation.

What did the top of the pistons look like as far as carbon and such crap built up? And I say crap, hard carbon isn't usually a problem but the soft oily stuff is, gets down in the ring grooves and packs them up.
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