Thread: Gorkas CFM 650 NK
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#1 Gorkas CFM 650 NK09-15-2013, 01:28 PM
I bought this bike with over 3.000 km on the clock. Although I am still waiting to get it plated (but that is a whole different story), I have ridden it and messed up with it (mostly) enough to share some notes.
The first thing I noticed after my first ride was that it was nearly out of coolant maybe half of it left. The issue about the loose hose clamps has been adressed well enough in other threads. The problema is now solved after simply tightening the screws, specially the one on bottom end of the hose on the left side. The good side is to think about all the time the bike must have been running like this without melting, very reassuring.
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Screws and threads are easily damaged, like some people have noted. In my case, I found that one of the two screws that hold the contact lock had been sheared inside its location. It might be that this happened as somebody tried to steal the bike from its previous owner, I dont know. While some people recommend to change as many screws as posible (which I dont agree, as it is better to damage a screw than the insert or nut) I do recommend to replace these two, as it is more difficult to remove once broken. Luckily for me, I could remove it and replace it. I also replaced the lock, which was slightly damaged. Thanks Bikerdoc for the parts!
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I also replaced the mirrors, which had too much play and didnt hold at legal (just about) speeds. I also placed new horns, BBS favourites.
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Another change I plan to do is the levers. My brake lever got notched and it was difficult to push down smoothly. Apparently, the soft aluminum was damaged by the edges of the holder. Maybe this was promoted by the loose screw. I was able to fix it with some fine sandpaper and after greasing, it is good for another few thousand kms.
Coming back to the leaks, I also found parasite air aspiration (or vacuum leak). I noticed the bike was rough and unstable on the first touch of the throttle, I could barely ride at 40 km/h in second gear without the bike stuttering. I found there were at least two spots of aspiration below the butterflies. One was (again) the loose clamps on the colector ports, and the second apparently the connection of the left vacuum hose to some short of manifold, below the battery case (anybody knows what that is for, anyway?) Instead of connecting directly to the manifold, it has a section made of thinner material (it feels more like a sleeve than a hose) and the clamp was very loose on it. Some rearragement of the clamps so they seat on the thicker material (where it is not deformed yet) plus some twisted some wire around it did the trick for me. After a reset of the ECU I can now stroll around town at 20 real smooth, which is way better for showing off.
Cheers from Dagang, Tianjin province,
Gorka.Last edited by gorka; 09-16-2013 at 06:25 AM.
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#2 Re: Gorkas CFM 650 NK09-15-2013, 02:32 PM
Thanks for sharing. Most of the issues with these bikes seem to come from the frame thread and bolt quality as well as loose factory parts.
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#3 Re: Gorkas CFM 650 NK
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#4 Re: Gorkas CFM 650 NK09-16-2013, 12:06 PM
I used to reset the ECU on my Nissan Skyline just like that, I did it about 2 a month as the ecu would learn if any poor quality petrol had been run through the car and would lower boost pressure and retard the ignition. I wish I had that car here in China !
Previous bikes . yamaha DT 50, DT 125, DT 250, DT 400, XT 500. Ossa 350 Trial, Ossa Mike Andrews replica. And now a Yamaha XTZ125 here in China.
Biking is like sex :- you don't have to be good at it to enjoy
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#5 Re: Gorkas CFM 650 NK09-16-2013, 01:30 PM
Going back home from work the bike was acting a little funny again.
Not as bad as before, but not completely smooth either. I clipped the hoses close to the carb to check and still no improvement. Maybe the hoses have some small crack upstream of where I clipped, close to the nipple, and when I messed with it i closed it but now it has opened again.
Besides, you can notice in the picture the hoses are a scant too short there too, so it wouldnt be a surprise they are damaged. And the bike had been running low on coolant too.
They are pretty stuck too, so I cant pull them out without breaking them, so lets see if i can get some new hose and fix it for good.
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Hi Symon, I miss my car too! But i dont wish it were here, I love it too much!
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#6 Re: Gorkas CFM 650 NK09-16-2013, 01:38 PM
I forgot to mention two more issues in my bike:
The brake pedal was way too high. It was posible to adjust it to a comfortable position, but i had to remove one of the two counternuts in the gap between the piston and the lever so I could bring them close enough.
I also found that the brake light switch at the pedal was not working. When trying to detach it I had a stream of wter running down the sleeve. It must had been there for quite some time because I had not washed the machine previosuly. When I managed to access the inside of the switch, I found it covered in rust. So Id say cut the sleeve above the switch and wrap some tape around it to make it wter tight.
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#7 Re: Gorkas CFM 650 NK09-15-2013, 02:43 PM
HI Gorka
Good post the more we all hear about problems like yours the more we can all be better of with our own bikes. Thanks for posting I need to post about my water leak now ."Arguing on the Internet is like running in the Special Olympics, even if you win you're still retarded"
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#8 Re: Gorkas CFM 650 NK09-16-2013, 01:48 AM
By the way how do you reset the ecu?
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#9 Re: Gorkas CFM 650 NK
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09-16-2013, 05:39 AM
You can reset the ecu by leaving the battery disconnected long enough. I do it by disconnecting the positive pole and putting it in contact with mass. That discharges the condenser that feeds temporarily the memory. It's a trick I learnt from my SUBARU (official) mechanic in Spain, with whom I shared a lot of experiences and time to debug a problem in my car.
I will post a pic later, can't do it from the phone.
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