The origins of the engine

[Greggl432]

Do these engines that come from the bicycle engine kit originate from a lawn mower engine, or a weed Wacker engine, or did someone design it to be specifically for fitment onto most bikes?

 

[Sidewinder Jerry]

Do these engines that come from the bicycle engine kit originate from a lawn mower engine, or a weed Wacker engine, or did someone design it to be specifically for fitment onto most bikes?

That depends totally on what kit you're talking about.

 

[Greggl432]

These,

are these the ones called chinadoll?

and didn't these revive the hobby of motorized bikes?

 

[GW's Motorized]

It comes from an old russian design. Others know more about it, but there used to be a company that made similar engines in russia, and these engines are a similar design.

 

[Wrench]

Do these engines that come from the bicycle engine kit originate from a lawn mower engine, or a weed Wacker engine, or did someone design it to be specifically for fitment onto most bikes?

China cheaply copied a Russian moped engine

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[Wrench]

Notice they talked about a high voltage transformer to operate the lights that created no problems for the induction coil
Meaning the engine could run lights and it didn't weaken the spark

 

[DAMIEN1307]

the engine could ruin lights

Did you mean "ruin" the lights, or "run" the lights???

 

[Wrench]

Did you mean "ruin" the lights, or "run" the lights???

Oops typo, fixed it

Thanks Professor Damien

 

[Wrench]

Did you mean "ruin" the lights, or "run" the lights???

I would like to know more about their high voltage transformer
The first model Riga 11 didn't have it and running the lights off the engine weakened the spark
But the second model Riga 13 had the high voltage transformer and didn't weaken the spark

Maybe I'll do some research later to see if I can find out what their High Voltage Transformer exactly was and how it was wired
But for now I gotta go out for a bit I'll be back in a few hrs

 

[cloakedvillain]

A good thread on this topic.

The Russian engines D-4,D-5,D-6,D-8. History.

I will tell about engines of the Russian manufacture which use in Russia for installation on a motor-bicycle. These are engines D-4, D-5, D-6, D-8, at present, they are not made. The factory which made engines is called ,,Krasniy oktyabr". Them exhausted since 1957, till 1990... So D-4 and D-5...

motorbicycling.com

A build thread using a D series engine. Thread 'Russian engines' https://motoredbikes.com/threads/russian-engines.3881/

While I agree with the changes in design, mostly due to the fact that it cut costs, these engines did lose some charm. Did gain a good bit of power though.

If only the cut cost went right back into quality control...