X18 rear sprocket/rim problem!!!

1482 Views 14 Replies 6 Participants Last post by drgnprelude, Jul 19, 2012

f22master

Discussion Starter · Jul 18, 2012

2

Well i've been riding my x18 for a little bit now, just getting a feel for it. I got it for $120 and ive put another $400 or so into it already...

So far all ive done to it is put on a 22mm mikuni, and a new exhaust. And it seems SO much faster than stock! I also put on a new Kenda 130/90-10 rear tire and it is so nice. It looks silly with such a big rear tire, but it rides nice!

Everything has been going great until about half an hour ago.... I have riden it a few hours today just cruising around my neighborhood and just as i was nearing my house, the chain popped off. Or so i thought! Once i got it back into my garage i realize that what had actually happened is a few of the rear sprocket bolts had backed out, and then the last few got pulled out!

Here is what it looks like...

What I am wondering is what i should do about this? Just use 4 bolts? Move the sprocket a few degrees and redrill all 6 holes in between the existing ones? Get a new rim?

Thanks for any and all help!

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1 - 15 of 15 Posts

bogieboy

· #2 · Jul 18, 2012

It looks like if you can get that one snapped one out of there, you could chase the threads out on all of em with a tap (someone else will have to chime in on the size...i know its metric, but thats all i can tell ya...) and run all six... And invest in a tube of threadlock...LOL

f22master

Discussion Starter · #3 · Jul 18, 2012

after looking at it closer, only 2 of the threaded holes are salvageable... Unless i open them up to m8x1.25
stock is m6x1.0

bogieboy

· #4 · Jul 18, 2012

drill em deeper and use a longer bolt? may not be a bad idea to punch em out to an M8 though....

BlitzMInc

· #5 · Jul 18, 2012

its hollow inside, you cant go deeper
i would concede defeat on that side and flip the rim around and put sprocket on the side the rotor is on
you really need the holding of all 6 bolts on the power side
on the stop side you could use 3 holes, and that would be a good thing to try and tap those in, i had to do both front rims i have with dual rotors so i know how it is
gl

bogieboy

· #6 · Jul 18, 2012

ahh didnt know it was a hollow hub... didnt look too close at mine...LOL

f22master

Discussion Starter · #7 · Jul 19, 2012

Well , its done. I drilled and tapped 6 new holes in between the old ones. I got 5 that are perfect, and one that is off. Not bad for doing it by hand lol. I went straight to M8x1.25 with them, so there will be plenty of strength! Ill put a pic up in a minute.

f22master

Discussion Starter · #8 · Jul 19, 2012

The new holes are the ones with the black bottom (i drilled all the way into the hollow part of the rim). The one at the 10 o'clock position is the one that's off

oh well, im confident that 5 M8 bolts will hold it just fine.

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BlitzMInc

· #9 · Jul 19, 2012

well either it will be ok, or it will shred the rest from being to weak
do a few wheelies first to make sure

f22master

Discussion Starter · #10 · Jul 19, 2012

Yeah, i think it should be fine. In a perfect world i would fill the old holes with weld and then reface the surface flat on a mill. But not having a welder or a mill really keep me from doing that.... lol

58Driver

· #11 · Jul 19, 2012

BlitzMInc said:
its hollow inside, you cant go deeper
i would concede defeat on that side and flip the rim around and put sprocket on the side the rotor is on
you really need the holding of all 6 bolts on the power side
on the stop side you could use 3 holes, and that would be a good thing to try and tap those in, i had to do both front rims i have with dual rotors so i know how it is
gl

Hey Blitz, I was thinking that I measured correctly and the x18 hub was not symmetrical. That is that one side sticks out slightly more than the other side. I know you have a stack of wheels to look at so can you verify this? I had to drill out broken stuff on both sides of my rear and I didn't mark the sprocket side. Thanks

swheels

· #12 · Jul 19, 2012

Hey I've got 3 1/4 center to center right to the cast line in the middle of the rim.

BlitzMInc

· #13 · Jul 19, 2012

far as i can tell they are even, ive use them both ways, the swingarm on the x18 is offset
if they are off it cant be more than a mm, but this is the chinese were talkin bout

swheels

· #14 · Jul 19, 2012

I've gotten away with racing with just 3 bolts holding the rear sprocket on. I just kept checking them after each time the track session was over. I wouldn't suggest this though i just didn't care to much and wanted to ride! Always make sure the wheel and chain is aligned. If you using better bolts use a lock washer and loctite.

drgnprelude

· #15 · Jul 19, 2012

f22master said:
Yeah, i think it should be fine. In a perfect world i would fill the old holes with weld and then reface the surface flat on a mill. But not having a welder or a mill really keep me from doing that.... lol

you could use jb weld to fill the holes and then a file to smith it out just to make sure your rim stays together I personally would not like my sprocket to rip out anything past 10mph

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