250cc 4 valve Grom Clone

[Bruces]

What’s up with the engine ?the name on the side of it looks like zonsen ,is it a clone of a clone or are my eyes failing me faster than I think ?
I have no interest in these bikes but it would be a lot of fun wringing it out .

[Thumper]

Nice swap! but Whoa,whoa, whoa. That is a 2 valve engine, isn't it?

4 valve zongshens are WATER cooled, aren't they?

[warrenpeas]

Originally Posted by Thumper

Nice swap! but Whoa,whoa, whoa. That is a 2 valve engine, isn't it?

4 valve zongshens are WATER cooled.

no its 4 valves. rated t 23.4hp but i guess 19.5 at the wheel on the dyno according the the russian video below.?

turn on closed caption and change the setting to english to understand what the hell they are saying.

here is the video of the 4v head

here he disassembles the top end.

here is the video of the dyno test vs the zs172fmm-6 vs a 172 2 valve i think and explain the power band difference .

here he compares the zs172fmm-6 to an older 2 valve version? zs172fmm-?

i just found these videos earlier today before work and havnt had time to watch them all and read everything they said but it is informative.

[warrenpeas]

Originally Posted by Thumper

Nice swap! but Whoa,whoa, whoa. That is a 2 valve engine, isn't it?

4 valve zongshens are WATER cooled.

when i was looking for ths motor i was tlaking to a seller in China i had bought zs190 horizontal engines from. i told him i wanted the most powerful Vertical AIR COOLED 4 stroke engine he could sell me and this was it he told me. although i wonder if there might be a more powerful 300cc option after looking into it more. Oh and i was trying to keep the price under 1000$ delivered. I paid $560 for this delivered to my door. in comparison the zongshen 212cc 4 stroke horizontal motor is $1080 delivered.

[delzy]

Originally Posted by warrenpeas

when i was looking for ths motor i was tlaking to a seller in China i had bought zs190 horizontal engines from. i told him i wanted the most powerful Vertical AIR COOLED 4 stroke engine he could sell me and this was it he told me. although i wonder if there might be a more powerful 300cc option after looking into it more. Oh and i was trying to keep the price under 1000$ delivered. I paid $560 for this delivered to my door. in comparison the zongshen 212cc 4 stroke horizontal motor is $1080 delivered.

OK, I just pulled the trigger on the 4-valve 250. There is also a 4 valve 300, but it appears to have a funny exhaust angle, so I thought 23hp would be enough. The 300 is the
Zongshen NB300-F

Someone should try this out.

[warrenpeas]

Originally Posted by Bruces

What’s up with the engine ?the name on the side of it looks like zonsen ,is it a clone of a clone or are my eyes failing me faster than I think ?
I have no interest in these bikes but it would be a lot of fun wringing it out .

Zongshen is the name of the founder i guess they have changed their name to Zonsen Industrial Group Co., Ltd https://en.zonsen.cn/. I dont know whay they put Zonshen vs Zongshen on the side but i know if you order more than 10 i think the number is they will put whatever you want on the clutch cover.