48 cc Russian Krasiny Engines inc one on an ATB Bike

[Old Operator]

I have these little Russian engines designed to mount on a bike. New & unused but old stock I bought in a closing down sale some 20 years ago. Motors date from the 1990s. Four of them inc one with a pull start, rest are bump start, & all have a manual clutch & reduction. One other that I have mounted on a bike which is rideable & working. £125 for all inc the bike.
Still have all paperwork to identify the chain & rear sprocket I put on the bike. Note they do not have a silencer (20mm electrical conduit fits the engine) nor fuel tank. Reason for sale downsizing to bungalow / old age. Engines were copied by the Chinese & are sold on Ebay but these old ones better quality. Located Shropshire. Edit - you might wonder at the forward facing exhaust - new third pic shows side cover in place over works - this was to make all 'stealthy' so it would pass off as ebike when motor not running

 

[V8Druid]

I have these little Russian engines designed to mount on a bike. New & unused but old stock I bought in a closing down sale some 20 years ago. Motors date from the 1990s. Four of them inc one with a pull start, rest are bump start, & all have a manual clutch & reduction. One other that I have mounted on a bike which is rideable & working. £125 for all inc the bike.
Still have all paperwork to identify the chain & rear sprocket I put on the bike. Note they do not have a silencer (20mm electrical conduit fits the engine) nor fuel tank. Reason for sale downsizing to bungalow / old age. Engines were copied by the Chinese & are sold on Ebay but these old ones better quality. Located Shropshire.

looks like potential fun to be had

 

[Vinpetrol]

A guy somewhere near me has one ! He rides past mine all the time he’s that fast I haven’t had the chance to stop him to get a bit of craic about it !

 

[Old Operator]

The bike does just over 15 mph @ rated governed speed with the 47 tooth rear sprocket & will climb a 1 in 4 hill with 'light pedal assistance'
It crossed my mind that the pull start motor might make a child's go kart with different gearing

 

[V8Druid]

- new third pic shows side cover in place over works - this was to make all 'stealthy' so it would pass off as ebike when motor not running

what size / capacity are the motors?

 

[Old Operator]

I am pretty sure they are 40 cc but might be slightly bigger but not over 48 cc. & are a two stroke, it says 25 : 1 for first 10 hours of use then 32 : 1 from then on. Max crank speed 3600 rpm, Drive sprocket beyond clutch max 920 rpm (when engine 3600 rpm)
Some info here https://motorbicycling.com/threads/the-russian-engines-d-4-d-5-d-6-d-8-history.6820/
https://www.moped2.org/rmoped.htm - The Riga, & the one on p2 feature the engines. The guy I bought them off had a one off of the bike & engine on p2 which he held on to called KPOXA
I will look for more paperwork re the number of cc's

 

[diggerjones]

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This looks Russian! He takes the starting mechanism off before the lad rides off and crashes