CX500 minor bob job - whooooot issues solved goes like a bat out of hell, for an old bike at least

[Maritime]

So i got 10 mins wirh the cx to test compressio. Results 120 - 90. Shit. Have to check valves. Put oil in low cilynder. No change. Must be valves. Hope it is just adjustment. So plans are a removal of huge signals and tails. Clean, paint, new seat, I like the bars and headlight. Front will be lowered and it will be good to go. Low budget. Got it for 250.

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[JustinLonghorn]

Re: Cx500 minor bob job.

I'm in.

 

[Maritime]

Re: Cx500 minor bob job.

So also when I hooked up a good battery I prompley blew a fuse or something. Yay. I am at the dentist now and will get to the valves when I get home. Had to do c test by using booster cables to the starter motor.

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[AlphaDogChoppers]

Re: Cx500 minor bob job.

Check to be sure you didn't reverse the battery polarity.

 

[Maritime]

Re: Cx500 minor bob job.

Got polarity right. Lights were on etc. Just popped when i hit the start botton. I am going to adjust valves then check comp again. The start stripping everything to get to work. Pics of progress later tonight I hope.

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[Big R]

Re: Cx500 minor bob job.

Signed up for sure on this one.

 

[Ringo]

Re: Cx500 minor bob job.

As am I.

 

[Maritime]

Re: Cx500 minor bob job.

Ok. So the manual sucks but google foo and vakves checked. Offending cylinder had a tight intake. Adjustment done and bang 125 psi. Redid other and te same. Found bad fuse. 10 amp in a spot should have been 20. Put a 30 in for now. Will be putting all new blade fuses in and moving fuse box anyway. Lovely oil. Lots of condensation. Flushed it out. Valves look alright though

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[Maritime]

Re: Cx500 minor bob job.

ok good night so far. on a computer now so typing gets better. Here is kind of the direction for this bob. Moto Mucci I think is the name of it. It is a Cafe but the minimalist clean lines are the direction I want to take. picture the mucci bike with the bars and tank from mine basically.

Pic

 

[Big R]

Re: Cx500 minor bob job.

Mike, there is a guy near me that might have a CX tank like that....if I get a chance to talk to him, I'll see if he has it and is willing to part with it.

And how does oil ever get that bad? Coolant leak?

 

[HerrDeacon]

Re: Cx500 minor bob job.

Mike, 125 psi is still really low, well below spec. Should still run with 125 but not well.

 

[Maritime]

Re: Cx500 minor bob job.

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.

 

[Maritime]

Re: Cx500 minor bob job.

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.

 

[Maritime]

Re: Cx500 minor bob job.

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.

 

[AlphaDogChoppers]

Re: Cx500 minor bob job.

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.

 

[Maritime]

Re: Cx500 minor bob job.

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.

 

[Maritime]

Re: Cx500 minor bob job - Now it runs

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.

 

[HerrDeacon]

Re: Cx500 minor bob job - Now it runs

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.

 

[Maritime]

Re: Cx500 minor bob job - Now it runs

Yep. I think i have a vaccum leak. Need to research on the carbs

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[Maritime]

Re: Cx500 minor bob job - Now it runs

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.

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