79' XL-125S engine converted w/ 81' XR200R crankshaft & cylinder head utilizing 125S 6-speed trans, cases etc. XR200R Rotor, left cover & windings. XL-125S ignition box & Coil.
Front forks are "Fox factory 44mm Forx" Conventional forks, triple trees & handle bar mounts. These are 1 of 200 sets manufactured for 78'-80'ish CR125/250R red rockets era MXers. These forks were purchased thru Cycle News advert in 84'. Forx were on 81'82' First Gen XR200R being raced in Cross country events. Fox Forx can be set up for as little as 11"-13" travel. Since Triple Tree came set up w/ 200R aluminum stem = "Complete Bolt On" which makes life easy! I raced this frame in some MX events but w/ 80' CR250R forks, which was a "Massive Improvement" over the 37-38(?) mm OEM 200R forks. With the 44mm Fox Forx, Handling got more stable in the Rough, but turning got even slower due to increased fork length and rake increased, giving somewhat of a chopper effect. The Fox Forx no doubt improved straight line tracking decreasing fork deflection and improved line stability in rocky, rooted, rutty slick trail systems such as in the Uwharrie National Forrest, Brown Mountain NF, Daniel Boone NF(Red Bird), Logan/Williamson WV, Hatfield McCoy trail System, Sam Houston NF Trail Systems & Croatan NF Trail Systems.
Realize these FOX Forks are Air Assist over Hydraulic damping. The standard air pressure for these are 11-13psi air pressure.
Seal life 6 months to 1 year at best "Per Thor Lawson" Suspension GURU Extroidinaire.
After quickly going thru the "Only Set of Fork Seals" obtainable at the time, I lived with the fox Forx constant weep even with continuous attention paid to relieving air from Forx after each riding event. NO replacement FORX SEALS were available from any supplier, as 43mm USD was the norm of the times. I had to resort to soaking the seals in the sliders, upside down in "Seal Conditioner" trying to get them to swell slightly to help keep the Fork Oil from oozing out.
Calfab Aluminum swingarm, OEM stock shock, rear Sun 18" rim, Stainless Steel spokes, Powroll header w/ Supertrapp silencer, Malcolm Smith Leather tool bag.
79' XL-125S bought in 82'ish w/ LH magneto side of crankshaft broken off. Converted to 194cc 85' ATC-200X 5-Speed trans, w/ "Large Fin" Cylinder and Cylinder head. Forward ATC kickstarter system has been deleted.
Chain drive is aluminum rear sprocket 428H for less power loss. Rear wheel assembly is 1976 CR-125M. Exhaust System Bassani w/ Eco' Silencer. Stock 81' XR200R Carb used w/ Quality aftermarket filtration.
Front end replaced w/ 1980 CR-250R fork assembly, tire/hub, and Rear Suspension replaced w/ Works Performance SuperCrossers from 1979 CR-125R red rockets. All non essential "XL" items have been removed for lightening including metal backed OEM rear fender. Answer Aluma' lite handle bars and side pull Magura period correct throttle.
my sons birthday present i’ve been cleaning up from an awful sorry state kx100. apparently it is a 1991 but i think newer. i’ve struggled to find the right boyesen dual stage reeds for the bike by not knowing the year! there a bit flat without these reeds on old kx motocross bikes and really need them soon!!!
Met the owner of this bike at one of my son's WWII reenactment events. Super nice guy and doesn't live too far from me. Hoping to meet up for a day of riding and maybe he'll let me give the beast a try.
My `79 XR 185 I bought when I was 15 years old, and that was just 35 years ago?.... I have thrashed this thing through he// and back several times growing up and then when it dropped the timing chain about 7 years ago, I tore it completely down and had the frame,tank,swing arm,etc...soda blasted, and replaced everything! It has been a blast! 😉
kx 100 i’m doing up for my sons 10th birthday 10th of march i thought this was a 1995 to 1997 but someone said this was a 1991 by the bikes frame number. i’ve been searching for boyesen dual stage reeds for this as my son prefers those reeds to factory for racing and i prefer them to but where struggling to find the right ones or right year to find them anyways. hope this makes sense sorry if it doesn’t! more kawasaki bikes to restore to come! here’s a pic of his 1988 kx60 also. and his pw80 he likes having a collection of bikes ?