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Discussion Starter #1
Hi every-one,
New CX owner here from Latvia.
First of all sorry for my english(it's not my native) therefore I will try to name all the terms and specifications correctly for your understanding.
So with no small talk here is the problem:
When I give my bike a full throttle it starts to cough. But when I give it a lean throttle it goes all the way to the red-line with no problem.
So for now I can't figure out what could be the problem? Some say that vacuum in carb is bad, some say that I need to adjust more fuel in carb. Previous owner said that he has adjusted everything in carb, even changed it to new one to prevent the problem but still no luck. He thinks that problem could be in valve adjustment. I have checked both spark plugs and wires, filters, cushions..all are new.
I also searched the forum and net, but couldn't find what could be the problem.
I made a short video for better understnding:


As you see at first attempt I give the bike a nice lean throttle(probably halfway or even one third) and it goes up with no problem. Second and third time I give it a full throttle and as you can see it starts to cough at 3000rpm and 5000rpm.
Also I want to mention that when I am riding it in 4th and 5th drive, even with lean throttle the bike starts to cough between 5000-7000rpm and to get it up I have to let go the throttle and gently pull it again to catch back the power and get more rpm.
So I hope that you could help me with this problem couse basically this is the only problem I have with this bike.
Cheers to all cx500 owners :)
 

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Your bike is an 82, which would normally be TI ignition. But your fuse cover looks like the earlier twin fuse one.

Can you verify for us whether your bike is CDI or TI ignition?
 

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Well I think it's the TI, couse the box is golden.
One single box ?
Size like a paquet of cigarrets ?
Then it's a CDI.

The TI-NEC has two small cubes with the sign NEC.

....and a welcome from Germany ;)

Also I want to mention that when I am riding it in 4th and 5th drive, even with lean throttle the bike starts to cough between 5000-7000rpm and to get it up I have to let go the throttle and gently pull it again to catch back the power and get more rpm.
Time to check the Ohm readings of Your stator....if it's a CDI ignition.

Lima_Check.jpg
 

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The 5/9 figure is low, even for the alternative figure some bikes have for that one [315 - 385] but this may be a moot point if the stator is an aftermarket replacement. An electrex brand from David Silvers has a 500 ohm measurement for this though. Any idea of the stators source?

3000 RPM sounds a little low speed for a stator fault to manifest itself but it can't be ruled out.

I would also try a new set of sparkplugs even though the current ones appear new. Have you physically checked the resister caps? They should be 5000 ohms if fitted with resisters, 0 ohms if not. Also, what sparkplugs is the bike running? You don't want resister plugs with resisters in the caps.
 

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Discussion Starter #13
Any idea of the stators source?
Don't know exactly but probably some after market from ebay, couse the previous owner said that it wasn't expensive. But as I remember he mentioned that the problem still persisted before the stator change..

Have you physically checked the resister caps?
The caps look like new and are with resisters. I am going to check later the spark plugs if they are or aren't with resister, couse right now I don't have the right instrument to remove them.

Accelerator pump?
Looks like my bike doesn't have accelerator pump.
 

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Put your multimeter on your plug caps from the lead side to the plug side on the ohms scale and tellus the readings.

Also the number of the sparkplugs fitted.

An 18 mm long reach socket will fit the plugs.
 

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Discussion Starter #19
Ahh sorry for not replying for a while, just got back from vacation.

Plug number?
So the bad thing is that I have somewhere lost my plug wrench and any other 18mm doesn't fit in. So for a while I won't be able to tell the plug number.
But anyhow, if you presume that the plugs aren't the right ones do you think just replacing them would fix this problem? Or is there any other things I could check?
And what about adjusting the valve clearance? Could that fix the problem? Couse the previous owner said that he has done everything he could think of to fix this problem but he hasn't checked the valve adjustment, but he said that now they are adjusted to factory standard, and that some other cx owners suggest to do some adjustment to the valve clearance..
 

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Discussion Starter #20
Plug number?
So finally received a new plug wrench to remove the plugs. The number on them is DR8ES(and a smaller number on them is k855).
Also added some pictures of condition they are in:
xjcqw0i2hyfndqd9gqfj.jpg
rhy7i4th6jptsfhi0jt2.jpg

Also waiting for some advice about the valve clearance adjustment - could this be somehow related to this problem?
 
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