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Old 04-14-2012, 06:34 AM   #31
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Quote:
Originally Posted by MihaSLO View Post
2004 didn't have cam sensor. As a matter of fact, no MV with 16M ECu uses a cam sensor.
Like Miha said.
The system is actually really simple. Crank timing - ECU - Coils and plugs.
F6 fuse is okay, so i'm thinking ECU or Eprom at this stage.
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Old 04-14-2012, 06:42 AM   #32
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Carl....do a compression and leak down test. Low compression with a low leak down would indicate cam timing is off. High compression can also indicate cam timing is off. Low compression and high leak down would indicate mechanical damage...listen for the air from the leak down tester to determine if valve sealing or piston sealing is cause (out the breather or oil fill is piston/rings).

My bet is the timing chain has jumped.
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Old 04-14-2012, 06:49 AM   #33
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Quote:
Originally Posted by esq'z me View Post
Carl....do a compression and leak down test. Low compression with a low leak down would indicate cam timing is off. High compression can also indicate cam timing is off. Low compression and high leak down would indicate mechanical damage...listen for the air from the leak down tester to determine if valve sealing or piston sealing is cause (out the breather or oil fill is piston/rings).

My bet is the timing chain has jumped.
I hope not, but possible, how do the 750's go with bending valve's when this happens?

Measure the crank position sensor with a Ohm meter, I think 680 - 700Ohm the book says, and a gap of .6-.7mm on the timing wheel.
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Old 04-14-2012, 07:08 AM   #34
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Quote:
Originally Posted by CAG View Post
Camshaft timing wheel bolts? I'm not sure what you mean. I haven't opened the stator cover to see if anything is going on in there.
sometimes I am.....
the timing chain cam shaft sprockets have two bolts that sometimes snap!
http://www.startwintrading.com/en/mo.../f4_750/oem/86 nr 9, i guess
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Old 04-14-2012, 07:36 AM   #35
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Originally Posted by hb88xx View Post
sometimes I am.....
the timing chain cam shaft sprockets have two bolts that sometimes snap!
http://www.startwintrading.com/en/mo.../f4_750/oem/86 nr 9, i guess

My 750F Honda did this years ago, just sitting at a stop street, bang and 6 bent valve's.
That makes me remember something Carl - does the motor spin faster than normal?
That was the case on my bike, because the valve's were not closing so at the exhaust you could hear it sucking and blowing as you spin it.
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Old 04-14-2012, 11:04 AM   #36
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12.3 volts on either side of the fuses. I've been alternating between two batteries. Is that too low? I haven't taken a reading at the battery posts.
Might be. I can't remember the threshold I found but it did surprise me. Charge it up to full charge (13.2-13.4, something like that) and give it a try. Remember when you are checking a static voltage, that isn't what it is once you are cranking, there will be a big drop. Something really easy to try.
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Old 04-14-2012, 11:48 AM   #37
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That's a low voltage reading Carl.. My project bike battery was charged in December and hasn't been charged since and the voltage is 12.5 Volts at the poles.

I would just fully charge the battery if nothing else to eliminate it from enquiries. I imagine you are anyway : )

My guess is your bike will fire right up once the battery is up to between 12.7 and 13.5 Volts ( nominally as I haven't got the text book here ).

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Last edited by gotojoe : 04-14-2012 at 11:55 AM.
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Old 04-14-2012, 12:58 PM   #38
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Battery charging has begun. I'm charging 3 of them. In the mean time, the compression numbers don't look good. They range from 70psi to 145psi. That may be because the battery was weak and I'm not spinning the engine fast enough.

Are cylinder pressures on the 750 supposed to be in the range of 100 to 200 psi. (7.7 to 14 bar.)
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Old 04-14-2012, 01:53 PM   #39
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Quote:
Originally Posted by CAG View Post
Battery charging has begun. I'm charging 3 of them. In the mean time, the compression numbers don't look good. They range from 70psi to 145psi. That may be because the battery was weak and I'm not spinning the engine fast enough.

Are cylinder pressures on the 750 supposed to be in the range of 100 to 200 psi. (7.7 to 14 bar.)
Compression shouldn't change based on how fast you spin the engine so a weak battery wouldn't affect that. Unfortunately, I don't know what the 750 compression is supposed to be for you.
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Old 04-14-2012, 03:14 PM   #40
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I'm pretty sure it is supposed to be more than 75psi. And even if it's not, the cylinder next to it shouldn't be 150psi.

I believe I need to remove the valve cover and have a look.

Who guessed timing chain?
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