I spent a day to put all the parts together and nothing was missing, no left overs! Nice machining. I used the conversion for gasoline and in the beginning it didn't start. I found out that the hall sensor works only one-way up, so, after turning it around, the motor started and runs very well. I suppose it has to run in, because taking over from stationary to full speed doesn't work so well. I fiddled with the mixture screw, but that did (up to now) not help much. Also it became very hot. After longer run in, i think, it will turn much better! But, all in all, nice motor, well made!

I received this little engine a coupple of months ago. delivered fairly fast with DHL.
I spend a coupple of evenings putting the parts together as described in the manual (online) and the thing would not start no matter what i did. It turned out one glowplug was defective and a little complaint was filed to Engine Diy. one week later a new glowplug (os brand) turned up in my mail box at no cost. this i super service!
after running the engine wich startet rigt up after the new plug was installed, I broke a starting belt ... simply by running the starter for a wery long period due to the glow plug failure and a lack of attention to the "preload" of the startingbelt. I ordered a new one and wrote afterwards to DIY that they were welcome to send one for free due to the glowplug that lead to the startingbelt issue. a coupple of hours later i recieved a message from DIY: Dear Sir, we will send you two new belts! This is unbelievable god service and I am not sure that I would get such a service even from my local Hobbyshop. I am wery pleased with the service and the shipping time. The engine is nice and priced fair or maybe even cheap to be honest. I would like to se an engine in almost same size that woud deliver aprx. 1,2hp. and with watercooling ... if it was a 300usd. engine it would be ok with me as long as it could deliver more power and run cool (watercooling). Conclusion: super service, cheap, nicely build product, fast delivery ... whats not to like.

Piston ring is missing. Can’t find it anywhere

The Otto-Sempto engine I tested, it is as always with Toyan engines, Toyan can make very precise CNC parts but the concept for engine development should be reconsidered.
The engines all have a shortcoming, they leak, the carburetors cannot be adjusted precisely and they get too warm.
There is considerable potential for improvement here.
The conversion kit is not needed to run the engine as a gasoline engine.
Two solenoids and the Cison double CDI are sufficient.

I bought this engine for my 11 year old son’s Christmas present for us to assemble together & his words: “the best present I’ve ever got” sums it up perfectly! The build quality of this little engine’s unbelievable & the assembly was very straight forward with easy to follow instructions found on the EngineDIY.com website.
I highly recommend this engine & the customer service I received when asking questions prior to purchasing this engine was fantastic!