So tonight I checked my valves on the new 250. The intakes were .003 and .004 and the exhausts were both at .005. So I decided to take the plunge and re-shim them my self.
I started by aligning the indent marks on the cam shafts with each other and with the piston at TDC. Then I stuff some shop rags around the cams so if I dropped anything it wouldn't fall into the lower end. I went to remove the bolts that hold the cam holder covers on and they were extremely tight. So tight on the exhaust side I had to use a breaker bar on the Allen wrench to get them loose.
After that all was good. The shims are pretty easy to get to and remove. On top of that they were the same size as the shims I had purchased for my Honda 250x. So I put in a size smaller shims and put the cover on the intake side and of course as I'm snugging them up I feel the threads let loose on one of the bolts.
I was so pissed, I hadn't even put a lot of torque on the bolts yet so I could recheck the valve gaps. While they were now good, the damage had been done. These crappy little bolts have such fine threads on them I have no idea how they would last and how the factory had them so tight. You could tell they hadn't put any thread lock on them or any other stuff on the threads.
So in the end, keep in mind that these are fine threaded bolts. My X has huge deep threads on the bolts that holds the cam and can really get a good bite.
Also, keep in mind that the bolts are of different lengths so don't mix them up. And no, I didn't use a short bolt in one of the longer bolt holes.
So, now the bikes in the shop and we'll see how much this costs me to fix. In my mind this is a POS design and this should never of happened. I can't believe they used such fine threaded small bolts and how they had them so tight. As you can read I'm not very happy at the moment, but in the end I'm not seeing the quality I thought I would.
Doug
I started by aligning the indent marks on the cam shafts with each other and with the piston at TDC. Then I stuff some shop rags around the cams so if I dropped anything it wouldn't fall into the lower end. I went to remove the bolts that hold the cam holder covers on and they were extremely tight. So tight on the exhaust side I had to use a breaker bar on the Allen wrench to get them loose.
After that all was good. The shims are pretty easy to get to and remove. On top of that they were the same size as the shims I had purchased for my Honda 250x. So I put in a size smaller shims and put the cover on the intake side and of course as I'm snugging them up I feel the threads let loose on one of the bolts.
I was so pissed, I hadn't even put a lot of torque on the bolts yet so I could recheck the valve gaps. While they were now good, the damage had been done. These crappy little bolts have such fine threads on them I have no idea how they would last and how the factory had them so tight. You could tell they hadn't put any thread lock on them or any other stuff on the threads.
So in the end, keep in mind that these are fine threaded bolts. My X has huge deep threads on the bolts that holds the cam and can really get a good bite.
Also, keep in mind that the bolts are of different lengths so don't mix them up. And no, I didn't use a short bolt in one of the longer bolt holes.
So, now the bikes in the shop and we'll see how much this costs me to fix. In my mind this is a POS design and this should never of happened. I can't believe they used such fine threaded small bolts and how they had them so tight. As you can read I'm not very happy at the moment, but in the end I'm not seeing the quality I thought I would.
Doug