This ISDT Rokon belongs to and was ridden Dave Mungenast. I haven't got any real details on the history of this bike. I think it was ridden by Dave in the 1975 ISDT, but I don't have any confirmation. I will try to find out more about the history of this bike and add the information as it becomes available.
Special thanks to Becky Gaines of Classic Motorcycles LLC for letting me borrow her digital camera to take these pictures. Becky also told me there is a good chance this bike will be on display at the Swap Meet section at Vintage Motorcycles Days at Mid-Ohio on July 7, 8 and 9, 2000.
I took pictures of things I found interesting, I hope you find them
interesting too. To see a full screen view of each picture just click
on it. The first picture (1) shows the
rear end of the bike with the enduro bag and extra belt. The second
picture (2) shows the crash bars that help
protect the aluminum torque converter cover. From the circle welded
on the front clutch section of the cover I am wondering if this bike or
at least the cover was used with a Comet clutch, when I modified my cover
for the Comet clutch I ended up with a hole about the same size and place.
The third picture (3) shows the cylinder and
head, if you look closely there are hole drilled through the fins and something
is threaded through the holes, I'm thinking sound deadening.
Moving toward the back of the bike (4)
we see the RTII looking exhaust, Koni dampers and aluminum carrier for
the rear disk. I also found the brake stay are to very interesting,
it aluminum with a 'I' beam like cross section very cool. All the
way to the back (5) you can see another view
of the belt and tool bag. Turning the corner to right side of the
machine (6) you can see the forward mounted
dampers, like the MX versions. Another interesting feature of this
bike is the right hand mounting of the side stand. I wondered why
it was equipped with the stand on the right side, it seems this would be
awkward to pull on the starter with the bike leaned to the right.
After think about this for a while my guess is there was no room in the
traditional spot on the right side due to the exhaust.
Moving forward (7) there a couple items
of interest, below the front sprocket and to the rear of the master cylinder
you can see a hole in the bottom plate of the frame, no doubt to let some
of the junk that tends to accumulate back there out. Sticking up
in front of the master cylinder is an enduro wrench held in place by a
rubber band. If you look closely you can see the 9/16" open end wrench
that is used on the chain adjusters. The next picture (9)show
how much metal was remover from above the recoil starter, much more than
the MX models. Next (10) the skid bars
that protect the RTII type low exhaust can be seen.
The next picture (11) is the right side
of the bike, followed (12) by the left side.
This bike has the 1975 style gas tank, shaped like the earlier fiberglass,
but made of plastic. I find this next picture (13)
to be of special interest, especially the steering head. The steering
head is gusseted on top of the top tube, but not nearly as much as the
frame on my Cobra, which was built in September of 1974. I find it
very interesting that a 1975 ISDT frame would have less gusseting in this
area than a Cobra frame. Does anyone have any insight into this?
I'm wondering if this frame wasn't built earlier and updated with a forward
mounted shock swing arm.
In this picture (14) you can see the aluminum
carrier for the front disk and the 8" travel front forks like those later
RTII. Next is another picture (15) of
the crash bars from the right side. This picture (16)
is another enduro wrench. The large socket is a 15/16" for the rear
axle. The small socket is a 13mm.
(17) Route sheet holder and speedo mounting.
(18) Top on the gas tank. (19)
Yes another view of the spare drive belt, but the white section in this
view has Rokon and the Rokon part number printed on it.
Picture (21), what appears to be a pop
rivet used as a rim lock in the cast wheels. And last
(22), show how the enduro bag is mounted, also note the spare set
of foot pegs mounted to the support bar.
If you have any comment or more information please e-mail me at firstname.lastname@example.org
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Ron, I've been checking your site since I acquired this RT 340 sidehack
rig last fall. It
was allegedly fabricated by a mad brit in the '70s, and has been sitting
out on a high western desert for about the past 10 years. It wasn't
badly rusted when I got it, but it took a lot of heatin' and beatin' to
get it apart. When I sanded off the orange-brown weathered plastic
tank to see what was down there, a glance from the fresh plastic to my
old John Deere suggested the color scheme. The frame build quality
is high: tubes carefully bent and bird mouthed, front and hack swingarms
have silent bush pivots - all joints brazed! The hack wheel rides
on a huge ball race. The aluminum body work was so nicely done that
I just hammered it out best I could, wire wheeled it, light sanded, masked
it off and painted it. The motor was good after minor repairs and
clean up, as were the speed reducer and drive pulleys. Jim Hosking
was a big help supplying the little bits, and always gave full credit,
no questions asked, for returned stuff that didn't work out. This is my
first Rokon, and it is a trip. It's a real screamer, in that it always
gets the monkeys screaming. Great brakes (sidecar brake is operated
by the monkey) allow interesting cornering techniques, usually requiring
good teamwork. Power braking the front wheel through turns allows
the back to get spinning and kicking out, releasing the brake into the
straight makes you feel like you're riding a sling shot. Motor
# is 7487650, frame # is RT 340 1386. Any info you have is welcome,
add this to the registry if you like. Tom Kean, Somerset Ky email@example.com
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