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Author Topic: CX500 minor bob job - whooooot issues solved goes like a bat out of hell, for an old bike at least  (Read 77580 times)

Offline HerrDeacon

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Re: Cx500 minor bob job.
« Reply #10 on: Nov 16, 2012, 06:51:39 »
Mike, 125 psi is still really low, well below spec. Should still run with 125 but not well.
Perry

1972 Honda CB350 K4 / 1978 Honda XL250S /1982 Honda MB5 / 2014 Honda CB500X

Offline Maritime

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Re: Cx500 minor bob job.
« Reply #11 on: Nov 16, 2012, 08:38:09 »
Nope, straight up condensation from running a short time and them storing in freezing temps, then thawing out again. I had my 450 oil turn that color once and it was aircooled.  Looks bad but if I ran it to proper operating temp for a half hour most of the water would evaporate out and the oil would look normal.  But it would also not protect the motor for the first part so I drained it and left the heads off etc in the warm basement to get the water out.  The heads and everything had moisture in them, warm air meets cold surface = water.
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Offline Maritime

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Re: Cx500 minor bob job.
« Reply #12 on: Nov 16, 2012, 08:40:34 »
Mike, 125 psi is still really low, well below spec. Should still run with 125 but not well.

I know, but it was a cold compression check, it will bump once warm.  My first check on my 450 motor was 125, after it was run a few times and operational a warm went to 155-160.  Also I only cranked the motor enough to see the needle bump 3 times and stopped. might have been higher if I let it go 5.  Didn't want to push it with the shit oil and all the moisture.


Edit, maybe your right, I couldn't find the numbers last night the manual i got sucks even worse then the other clymers I have. It says 171 +- 28 so I should maybe check it again and see.  That should be a warm compression number though, I usually see approx 20-30 PSI increase when doing a warm engine and that puts it on the low side of the range.  Now I need to get the carbs cleaned and fire this thing to see if it may need a top end rebuild.
« Last Edit: Nov 16, 2012, 08:50:46 by Maritime »
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Offline Maritime

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Re: Cx500 minor bob job.
« Reply #13 on: Nov 16, 2012, 08:56:42 »
Oh and Rich, thanks fro the thought on the tank. My Dad-in-law that the bike is for isn't into cafe, low bars etc, more the bobber thing for hims so the C tank is fine. If it was me, I'd be all over the other style tank.
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Offline AlphaDogCustoms

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Re: Cx500 minor bob job.
« Reply #14 on: Nov 16, 2012, 10:49:12 »
I know, but it was a cold compression check, it will bump once warm.

I agree. It's not at all unusual for an engine that has been sitting a long time to read a bit low. I have a CX500 in my shop right now that hasn't been run for a long time. Compression is low. I am going to dump some Seafoam into the spark plug holes to make sure the rings are free, and run it before I condemn it to a ring job.
...every dump I take is original too, and it doesn't smell any better because of it's originality.

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Offline Maritime

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Re: Cx500 minor bob job.
« Reply #15 on: Nov 16, 2012, 11:00:47 »
I agree. It's not at all unusual for an engine that has been sitting a long time to read a bit low. I have a CX500 in my shop right now that hasn't been run for a long time. Compression is low. I am going to dump some Seafoam into the spark plug holes to make sure the rings are free, and run it before I condemn it to a ring job.

Yeah this bike ran last more than a year ago and that was for like 2 mins up the road then parked and not touched.  It was a guys project and it just got left.  His son got it to run just enough.  I haven't bothered yet, I want to pull the carbs and clean them up well and them set everything to factory.  Then I will fire it run it a bit and then tear it down to the frame.  The seafoam is a good idea, I think I may get some to run through this bike as well.
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Offline Maritime

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Re: Cx500 minor bob job - Now it runs
« Reply #16 on: Nov 17, 2012, 18:50:35 »
OK.  Spent some time cleaning carbs the one for the cylinder with the badly adjusted intake had a lot of crud. The other was not bad.  I didn't take pics, too busy. I refilled the bike with good oil. attached the little suzuki DR tank took it outside and hit the starter with the good battery connected. Fired right up after 2 pushes of the starter, climbed to 5000 rpm and sat there running just fine.  No smoke after the first fire and good strong puffs out the pipes.  I tried adjusting the idle speed but it didn't seem to do anything. I am going to guess there is something with the vaccume petcock and the mixture screws etc. I need to dig into the manual.  Happy it runs, now I know it is worth continuing on the project.  Next step, tear down and clean cut build stuff.
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Offline HerrDeacon

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Re: Cx500 minor bob job - Now it runs
« Reply #17 on: Nov 17, 2012, 20:03:41 »
Excellent, to hear, always a good feeling getting them going. Did you check to make sure the the throttle cable wasn't too tight and keeping the carb open.
Perry

1972 Honda CB350 K4 / 1978 Honda XL250S /1982 Honda MB5 / 2014 Honda CB500X

Offline Maritime

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Re: Cx500 minor bob job - Now it runs
« Reply #18 on: Nov 17, 2012, 20:30:43 »
Yep.  I think i have a vaccum leak.  Need to research on the carbs

Sent from my MB525 using Tapatalk 2
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Offline Maritime

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Re: Cx500 minor bob job - Now it runs
« Reply #19 on: Nov 17, 2012, 22:56:20 »
So I checked into the carbs.  The 82 are rated as the best but are very picky.  I didnt have them set up and the air box wasnt connected 100%.  I think I am good to strip down and get the bike ready.  Will just need to really tune it well come spring.  I think I will keep the air box and exhaust stock to prevent tuning issues.  Next step is building a bike table and list of parts.  I know one intake is missing an o ring and I sealed it with rtv for the test fire.  I wont leave it that way. 

Sent from my MB525 using Tapatalk 2
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson