11-18-2013, 11:45 AM | #16 |
Join Date: Mar 2009
Location: Southeastern Washington desert
Posts: 14,761
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Excellent plan, sounds technically challenging but that's right up your alley!
Looking forward to the pics. Is this bike going to Bonneville?
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Happy to serve. |
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11-18-2013, 12:47 PM | #17 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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We eagerly await further updates!
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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11-19-2013, 12:10 AM | #18 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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It just might!
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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11-19-2013, 11:57 PM | #19 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Since this bike will no longer be suitable for off-road, I've moved it to the Street category.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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11-20-2013, 09:35 AM | #20 |
Join Date: May 2007
Location: Altamont, Kansas
Posts: 15,103
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Where are the pics?
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You meet the nicest people on a Honda Clone. |
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11-20-2013, 10:47 AM | #21 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Don't have much to show yet. Bro in Law lives in Calgary, so we're lucky to get time once a month on this bike. He doesn't want me to proceed on my own, since he appreciates the learning curve. It's his first bike and first fabrication project.
We're still in the process of de-tabbing the frame and figuring out what changes to make. I find this shot to be particularly interesting, since it compares the Roketa frame with an '81 XR200 (not the R version). You can see how we've removed the seat base metal and cut the gussets. We then heated the steel and bent the seat hoop down until it was in line with the area that is forward of the seat. This shot shows how I've yet to fabricate the mounts for the rear shocks, which were donated by the XR200, as was the swingarm. There is much to be done, and we're now focused on the motor, since it's easy work to do inside the shop during cooler and wetter weather. Stay tuned.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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11-20-2013, 01:31 PM | #22 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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All right! Brother Tom is working the angle grinder!
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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11-20-2013, 01:43 PM | #23 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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I can hear the neighbors. "What are they doing over there now?!
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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11-21-2013, 01:34 AM | #24 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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They're very used to me. They also appreciate that I'm always ready to lend a hand.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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11-21-2013, 01:39 AM | #25 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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I was kidding, of course. I'm sure your neighbors were not disturbed, and they appreciate your willingness to help.
__________________
Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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11-21-2013, 10:46 AM | #26 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Further to the displacement discussion, I remember being quite puzzled by the markings on the Roketa motor when I first brought it home (page 3 http://www.chinariders.net/showthrea...=roketa&page=3 ). I couldn't wrap my mind around how 125cc was indicated, yet it was badged as a 200. I'm still not sure why the markings are as they are, but I have the answer about actual displacement.
With this 200cc OHC motor, the bore is a whopping 68.5mm, and the stroke is a tiny 52.5mm. The standard-issue 223cc OHC motors use a 65.5mm bore and a 66.2mm stroke. My 200 would rev nicely, but make very little power down low. The 223 would have more low-end grunt, but would max out at a lower rpm. I'm very hopeful that I can combine the 68.5mm bore with the 66.2mm stroke for an unprecedented big bore and stroke China motor. I'm about to pull the trigger on some parts from Taobao to do the deed. For the sake of interest, I compared the OHC Roketa parts with Honda XR200 parts, and found very little that would swap over. The stud spacing is considerably larger on the Roketa, so you can't put a China cylinder and head on a Honda bottom end. Even the valvetrain is different. What remains to be seen is if I can stuff a monster crank in an XR200 motor to create an awesome stroker; that, mixed with the 10:1 Wiseco piston I have would be lots of fun. I know that the China crank has a different flywheel taper, but I could likely overcome that by using a China flywheel and electrics. I can't answer that at this time, because the flywheel requires a 28mm female puller that I've never seen. That'll come from Taobao as well.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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11-21-2013, 02:16 PM | #27 |
Join Date: Mar 2012
Location: Altoona, Fl
Posts: 158
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this thread brings me so much joy
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NewStar DB 200 Facts are meaningless. You could use facts to prove anything that's even remotely true! --Homer Simpson |
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11-21-2013, 09:02 PM | #28 |
Join Date: May 2007
Location: Altamont, Kansas
Posts: 15,103
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You probably fix all their broken stuff too.
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You meet the nicest people on a Honda Clone. |
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11-21-2013, 10:56 PM | #29 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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I presume that you're not giving me a hard time.
I totally geek out over engine building, especially when I can manipulate the rod / stroke ratio and stuff like that.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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11-21-2013, 10:58 PM | #30 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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I've been known to. Doesn't hurt to stay on the neighbour's good side, especially when your son and his friends fire up the dirt bikes when you're not home.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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