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Post by raygyver on Mar 22, 2020 0:48:08 GMT -5
I seemed to fall off the deep end here, I ordered some dowel pins for my engine, because i bent the other ones installing the bbk. They didn't fit, they were marked as 8x14, which is the size, but they were microscopically off. (I accidentally dropped one down the chain area, and managed to get it through the piston hole using a magnet) so i thought i could unscrew a crankcase stud, and put it on from the other end, but that didn't work either. Now, I have 2 crankcase studs removed, and they aren't the same size, and don't know which ones which. My main questions are Can't I just screw it back in and if so, where do i find the torque specification? Which size stud goes in which hole? Seems to be 2 different sizes, and i got them mixed up accidentally Is there a technical data sheet somewhere that gives me all this info? Also, i noticed very slight marks on the piston, after only 50 miles. I will post a pic tomorrow, but was wondering if that's bad news, and if so, what mistakes in the build would've caused that, and how do i avoid it on the next build?? Whew.. Thanks!
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Post by Kenho21 on Mar 22, 2020 0:57:46 GMT -5
What scooter do you have?
I’ve never seen a motor with two different size studs, but maybe someone else here has?
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Post by raygyver on Mar 22, 2020 1:33:53 GMT -5
It's a 2013 jonway agility yy50qt-6 qmb139. I found it abandoned, and it had already been bored out to a 80cc. Who knows, maybe it's not supposed to have two different sizes and someone messed up. No idea on its history but it's got 4500km on it.
I want to get it running good first, then try to tune the transmission and try to get the extra power out of it.
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Post by christopher on Mar 22, 2020 10:53:43 GMT -5
What exactly is different, length or diameter?
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Post by raygyver on Mar 22, 2020 11:40:21 GMT -5
The length is different by maybe 5 or ten millimeters
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Post by christopher on Mar 22, 2020 13:44:00 GMT -5
If it’s length, did one of the studs go through a shroud or cover to help secure it?
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Post by 2stroked on Mar 22, 2020 17:19:45 GMT -5
The lover studs go where they are needed for the can cap. The dies of the engine with the chain have the longer studs. Well, on the last Hondas I did this was the case.
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Post by GrumpyUnk on Mar 23, 2020 10:38:06 GMT -5
If you install the studs into the block, and then stack the cylinder, head and valve/cam support in place, you should be able to determine whether the length ABOVE the top of the stack is longer or shorter, too long & too short if in the wrong hole in the block. IOW, the length above all the bits to be held in place should be just about the same, and, generally, it will be too short to install the nut in one, if it is in the wrong hole. As far as the guides(ferrules), they should be able to be installed into the block/cylinder/head/cam carrier as needed, without being installed on the studs. The studs tend to get slightly bent, and make the ferrules bind so they cannot be installed readily without using more force than fingertips can provide. Install the ferrules in the pieces when OFF the studs, and you should find they push in without problem. They may be sort of stiff, but should slide in if they are the correct ones. I thought they were all the same size. You can check with a micrometer, and also measure the hole diameter on the block/head/carrier. They install over different studs depending on which parts. tom
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Post by mike007 on Mar 24, 2020 11:06:48 GMT -5
i had a tao tao with a 50mm big bore on it an when i took motor apart it had longer studs on the side that has the timing chain.
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Post by jackrides on Mar 24, 2020 23:36:59 GMT -5
Mike, that's one fine photo!
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