1999 ATK 250LQ

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brademan76
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1999 ATK 250LQ

Post by brademan76 »

20260419_172729.jpg
20260419_172729.jpg (4.54 MiB) Viewed 2351 times
Just got this bike and am ordering parts and thinking on things to do with it. It didn't come with a carb, luckily I have a couple pwks from my kdxs that I've replaced with lectrons, so I plan to use one of those while I decide if I like the bike enough to put a SC or Lectron on it.

While going through things, the piston was wrecked and had transferred a good amt of aluminum to the cylinder but I think the cylinder is ok. Either way it's getting sent off to Ted Boyko to do some work on it to improve bottom end as this 250 rotax engine is known for it's top end with an anemic bottom. The adjustable exhaust valve is interesting and I'm looking forward to playing with that.

The linkage-less rear suspension interests me for its simplicity especially for access to easily pull off and adjust as needed.

Opinions Needed-
I've torn apart the shock to rebuild and got exploded parts diagram from ohlins as there was zero information online on this model shock as it seems one off for this particular bike. The guy from ohlins said to use an ohlins shock oil that is 28cst, which seems heavy vs the Showa ss-7 (5w) @15.7cst that I use in my KDX shocks. I ride tight single track/enduro mainly, no mx track. Should I just stick with my 5w or move closer to basically a 10w?

I'm also excited about feeling the 46mm Paoili "blue steel" (essentially KYB) forks.

Definitely a quirky bike but I'm looking forward to getting it in good shape and seeing how it rides.
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billie_morini
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Re: 1999 ATK 250LQ

Post by billie_morini »

Brad, so very cool! Hope aggravations are minimal & the bike becomes functional with ease.
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Chuck78
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Re: 1999 ATK 250LQ

Post by Chuck78 »

Very unique bike! A local guy near me has or formerly had an ATK 4-stroke, which very oddly was a motorcycle engine that used a timing belt!



Wow, the clutch and the kicker are on the left side!
'97 KDX220R - purple/green! - KLX forks, Lectron, Tubliss
'97 KX125/220R hybrid build! - '25 KX450X suspension, titanium hardware, extensive mods purple/green!
'99 KDX220R project - '98/'01 RM125 suspension, Titanium hardware, Lectron Billetron, Tubliss
'77 Suzuki PE250 & '83 PE175 Full Floater - restomod builds
'77 Suzuki GS750-844cc, '77 GS400 & '77 GS550 big bore builds
'62 GMC 1000 Panel Truck
'88 Suzuki Samurai TDI/Toyota swap
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brademan76
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Re: 1999 ATK 250LQ

Post by brademan76 »

Chuck78 wrote: 01:00 pm May 07 2026 Very unique bike! A local guy near me has or formerly had an ATK 4-stroke, which very oddly was a motorcycle engine that used a timing belt!



Wow, the clutch and the kicker are on the left side!
Yeah I like the idea of the kicker on the left so I can keep right foot on rear brake in steep stuff!

LMK your thoughts on getting a pwk for this bike.
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