Greetings, followers and fans of those loving “orphan toys.” My apologies for the extended gap between blog posts. More important things in life got in the way over the summer (passing of a relative, relocation of another, and other such worthwhile uses of focus). Thank you for coming back to check the latest.
KMR02 and I have been getting along quite well with the little time we’ve had together. A very active thread on this bike has spawned itself in the “Chinese bikes” section of TT Forums, and I’ve been contributing/following there in my few available moments. However, there are a few updates I’ve saved for this page, and I’m glad I get to share them.
First off, I went ahead and changed up to an Attack Graphics package purchased for the 2014 KTM250SX from Rocky Mountain...quite happy with the result.
The second update involves both noise and weight. The stock muffler is amazingly heavy and is overly loud in my view. As a replacement, I chose to pick up a LEXX muffler for the KTM250/450 four-strokes, along with the extra “trail saver” super-quiet insert. The price was great (around $180 and $20 for the insert), it weighed less than half of the stocker, and now my bike is quieter than my daughter’s TTR90E at idle.
The fitting did require I get a 1-7/8” to 2” sleeve from AutoZone, as I couldn’t use the provided KTM mid-pipe, and the header…while big and open for this motor…was smaller than the muffler inlet. That insert sleeve, plus a little high-temp silicone, and I’m happy as a clam with the result.
Third up was the gearing. This this was geared for dual-sport/street use. I decided to go with a 48-tooth rear aluminum from Primary Drive, along with a 118-link chain that I ended up dropping to 116 links (I like to be in the middle of the swingarm adjustment range). Much better “pull”, and I don’t think I’ll miss the top-end at all.
Finally, and this was the big one, I decided to install an oil cooler…a standard 125cc unit available on eBay for Chinese DB engines. Central Texas has been hot this year, and I want to do everything I can to make this girl last. More oil volume and cooler temps will both assist in that effort.
As can be seen in the pictures (see the attached gallery), I was able to make some minor cuts and bends to the mounting brackets, allowing the unit to fit inside the shroud brace behind the formerly-decorative radiator louvers. Routing was simple, and there is an inline oil screen that replaces the stock unit removed for the line attachment. Make sure that you run some oil through the unit so that you can identify flow direction from the center (output) of the attachment plate. You want oil to go the proper way through the filtering screen.
The ultimate installation results are quite satisfying to me, though I likely could have gone with a smaller unit. However, I’d consider this addition a must-do to anyone purchasing the dual-sport-rigged version of the bike now available from Orion Powersports. She runs much cooler in triple-digit weather now, and I’m happy I could do something like this to “treat her right.”
One negative I noticed about the oil cooler…warm-up time before it can come off choke has doubled. One poster who goes by the handle “dfast” on TT has convinced me to switch to a 32mm flat-slide carb, saying it really wakes the bike up and results in a nicer, almost-no-choke start. You can be sure that I’ll put the mod effort and history here for you readers.
Oh, another thing dfast got me into was some weight-saving experients. With his help, I'm mounting a modified NC250 kickstarter (also in gallery), which is half the weight of the stocker and has far better leverage for the stroke...though I've never had to use anything but the easy-button so far. He also hooked me up with my first-ever titanium bolts...totally addictive.
Expect more updates as the weather cools, the rides become more frequent, and King Moon Racer 02 evolves.