01-21-2022, 12:57 PM | #1 |
Join Date: Jan 2022
Posts: 4
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Constantly adjusting valve clearance
I have a 2013 SSR 250. When the valves are in spec it fires up with the first touch of the e-start. But after about 20-30 minutes of riding it starts to feel down in power and eventually won't start at all.
The only thing I've found to help is adjusting the valves. I open the bike up and the valves are out of spec too wide every time. The frustrating part is the set screw is never loose so I have no clue what is causing my valves to constantly get out of spec. Is anyone else having a similar issue? When I put them back in spec she runs like a dream again. It's to the point that I don't really take it on rides anymore because I can't trust that I'll make it back to my truck. |
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01-21-2022, 01:10 PM | #2 |
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Location: Houma, La.
Posts: 11,705
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You might want to check that your valve seats aren't loose and being hammered into the head.
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01-21-2022, 01:37 PM | #3 | |
Join Date: Oct 2013
Location: Boone, NC
Posts: 187
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Quote:
It looks like a complete head for an NC250 is about $125 on Aliexpress. They aren't too difficult to install, especially with all the online videos now. |
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01-21-2022, 04:08 PM | #4 | |
Join Date: Jan 2022
Posts: 4
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01-24-2022, 12:23 AM | #5 | |
Join Date: Oct 2013
Location: Boone, NC
Posts: 187
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Quote:
Assuming your engine is an NC250 you could also install a 300cc big-bore kit for another $200, while you've got the head off. It made a noticeable improvement on my bike. |
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01-24-2022, 03:05 AM | #6 |
Join Date: Nov 2017
Location: Marseille, France -> Conakry, Guinea
Posts: 1,481
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Post up a pic of your motor before you buy anything, I suspect that your motor predates the NC 250 by several years.
Also, what's your valve adjustment technique? Are you adjusting them on a cold motor that has sat overnight? What specs are you adjusting them to? I would await your response before you buy anything. |
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01-24-2022, 05:56 AM | #7 |
Join Date: Oct 2020
Location: Flower Mound Texas
Posts: 904
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I know the old ktm rfs motors came with "soft" intake valves that needed allot of adjusting, so it's not hard to imagine with the quality control of some of the Chinese bikes that they'd have similar or worse issues. Maybe valves, maybe seats, maybe other valve train parts?
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01-25-2022, 01:49 PM | #8 | |
Join Date: Jan 2022
Posts: 4
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01-25-2022, 03:45 PM | #9 |
Join Date: May 2018
Posts: 1,637
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There should be a bunch of numbers beside your shifter ,post them up and the Genius Bar boys will tell you what you have . Truck
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01-27-2022, 05:01 PM | #10 |
Join Date: Jan 2022
Posts: 4
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I didn’t get a chance to check near the shifter but I did get some pics of the cylinder and head from the right side of the motor.
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01-27-2022, 07:48 PM | #11 |
Join Date: Oct 2013
Location: Boone, NC
Posts: 187
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Not the best photo, but that is a water-cooled engine. The numbers are different than on mine, but everything else looks like a Zongshen NC250 to me. I'm sure an expert will chime in and confirm whether it is or not soon.
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06-15-2022, 03:22 PM | #12 |
Join Date: May 2022
Posts: 13
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Did you ever get this sorted out?
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06-15-2022, 03:28 PM | #13 | |
Join Date: Sep 2021
Location: De Soto, MO
Posts: 1,939
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Quote:
On the wrong one, the exhaust rocker is tight. On the right TDC, both rockers are loose. Super important to get this right, then re-check it by rotating the engine a couple of times (easier with the spark plug out) to verify your adjustments.
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