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Another Dnepr in da House.


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#1 DocSjulle

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Posted 05 September 2015 - 04:04 PM

The MT9 I bought will take too long to fix up, and having got the sidecar fever, I found a much more complete MT10-36 to get quicker on the road.

This also needs some TLC and as both heads are broken, I have had to borrow from the MT9.

But after fixing the electrics, adding two more indicator lights to the bike, putting K68s on it, and cleaning and adjusting the brakes, it actually runs now.

Next step is to adjust the carbs at bit more, and punching the serial number in the hack, and then hopefully getting some plates on it.

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1973 Dnepr MT-9 and sidecar
Denmark

#2 SafetyBob

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Posted 07 September 2015 - 02:19 PM

Very very nice :smile:
Dnepr- So Much Fun- It's addictive!
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#3 racepres

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Posted 11 September 2015 - 08:18 AM

I like it alot !

#4 DocSjulle

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Posted 26 January 2016 - 01:20 PM

The bike has been registered some time ago, and I have added right signal lights so it can be used solo too.

When I got home I wanted to start it up and drive it back in the garage, but then the gearbox cracked open.
It was an old repair which failed again.

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1973 Dnepr MT-9 and sidecar
Denmark

#5 DocSjulle

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Posted 26 January 2016 - 01:51 PM

So having both the MT9 and the MT10-36 non running, I decided it was time to rebuild the spare engine and gearbox.

Everything was cleaned and taken apart, and both engine and gearbox looked in good shape, needing only new bearings, seals, and of course a total rebuild of the cylinder and head.

I bought HQ parts to hopefully make it better and more reliable. FAG bearings, quality seals, Almot pistons, HQ valves and guides from Moto-Boxer.

I spent a lot of time cleaning the engine case, crank and rods for casting seams and general rough surfaces.
The rods were also balanced, and the new main bearings trimmed to fit perfectly.

The heads were mildly ported before installing new guides and getting the 3 angle valve seat job done.

The gearbox went together quickly, but the engine was assembled today because I had to wait a long time for the machine shop to bore the cylinders and cut the valve seats.

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1973 Dnepr MT-9 and sidecar
Denmark

#6 DocSjulle

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Posted 26 January 2016 - 01:58 PM

The sharp edges on the piston crowns where smoothed to prevent hot spots.

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1973 Dnepr MT-9 and sidecar
Denmark

#7 Solly

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Posted 12 February 2016 - 11:53 PM

Its interesting , my gear box was very porous in that same approximate spot. when I removed the shifter for tigging it was paper thin in a half inch circumference of that spot.

#8 Serious Black

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Posted 13 February 2016 - 02:24 PM

You can seriously round off the valve pockets in the piston to improve low lift gas flow. Do what you did to the pistons to the sharp edges on the valves too and smooth off thesharp edges in the ports - a light radius about 1.5mm will do- don't go crazy. You will be surprised at the difference.
The devil is in the detail.

#9 guzzidude

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Posted 25 February 2016 - 09:37 PM

Looks great
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#10 DocSjulle

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Posted 27 February 2016 - 09:30 AM

View PostSerious Black, on 13 February 2016 - 02:24 PM, said:

You can seriously round off the valve pockets in the piston to improve low lift gas flow. Do what you did to the pistons to the sharp edges on the valves too and smooth off thesharp edges in the ports - a light radius about 1.5mm will do- don't go crazy. You will be surprised at the difference.

I didn't want to go to crazy on the pistons, as I was afraid to lower compression.
The ports have been smoothed out too, but not polished.
1973 Dnepr MT-9 and sidecar
Denmark

#11 DocSjulle

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Posted 27 February 2016 - 09:39 AM

The bike is running great now and I have just changed oils after the first 50km of riding.

After my first small test ride the engine broke down because one of the pushrods had become too loose, and gone past the adjustment screw in the rocker. This happened because I had not noticed the pushrod didn't fit the rocker adjustment screw, causing it to sit on the edge of the pocket in the screw, and not fully into the pocket.
Then when it was pounded to fit by engine, it became too loose.
The exhaust valve was also sticking so that might have added to the problem.

But after fixing those issue the engine is working perfectly, and there has not been any problems since, other than the usual adjustment of valves.
1973 Dnepr MT-9 and sidecar
Denmark




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