The grom uses a more modern type motorcycle transmission in comparison to the older style used in the CT 70 and z50s.
The Honda nice 110 engines available in Thailand and Europe in the Wave 110 have been a really popular for tuning as they have the same mounting configuration as the z50, CT 70, trail 90 and trail 110 bikes as well as several other bikes. The difference is the nice engines are built a lot beefier, have a better charging system and are also more modern than the old engines. This makes them a great drop in replacement for all kinds of bikes.
Chinese and Japanese companies have made many copies of this design and some with improvements, but some come up short in the quality department.
Popular ones include:
YX series engines, GPX, Zongshen, Lifan, Daytona etc...
Many companies you see out there like piranha, stomp, SSR or Pitsterpro use one of the engines listed above, just with their name stamped into it and maybe a few slight design differences specified by the company.
The Grom although also a horizontal design does not mount the same as these engines.
The monkey bike scene over here in Europe is pretty big. Last year at one of the meets there was row after row of $10,000+ monkey bikes. A company here called TJR sells engines putting out upwards of 28HP if you can afford it and they are using the Nice engines as a basis.
This has a lot to do with the transmission, clutch and quality components.
This is a good link with some pictures of the Nice transmission
Nice Engine Headquarters Motor City Mini Trails
Grom clutch
![Auto part Engine Automotive engine part Carburetor Automotive starter motor]()
The shift forks are of similar if not better quality than the nice
![Auto part Machine Gear Engine Automotive engine part]()
The gears also use 4 lugs or hubs to transfer power
![Auto part Gear Transmission part Hardware accessory]()
Timing chain and tensioner system. The problem with this tensioner system is I have heard reports of them not holding up when dual valve springs and a higher lift cam is installed. This is probably because it puts a lot more strain on the chain and idler pulleys.
![Auto part Bicycle part Engine Bicycle drivetrain part Disc brake]()
So there you have it, it looks like it should hold up well in comparison to the nice engines,but we may not really know which are the weak bits until we get up in the 15+hp range
The Honda nice 110 engines available in Thailand and Europe in the Wave 110 have been a really popular for tuning as they have the same mounting configuration as the z50, CT 70, trail 90 and trail 110 bikes as well as several other bikes. The difference is the nice engines are built a lot beefier, have a better charging system and are also more modern than the old engines. This makes them a great drop in replacement for all kinds of bikes.
Chinese and Japanese companies have made many copies of this design and some with improvements, but some come up short in the quality department.
Popular ones include:
YX series engines, GPX, Zongshen, Lifan, Daytona etc...
Many companies you see out there like piranha, stomp, SSR or Pitsterpro use one of the engines listed above, just with their name stamped into it and maybe a few slight design differences specified by the company.
The Grom although also a horizontal design does not mount the same as these engines.
The monkey bike scene over here in Europe is pretty big. Last year at one of the meets there was row after row of $10,000+ monkey bikes. A company here called TJR sells engines putting out upwards of 28HP if you can afford it and they are using the Nice engines as a basis.
This has a lot to do with the transmission, clutch and quality components.
This is a good link with some pictures of the Nice transmission
Nice Engine Headquarters Motor City Mini Trails
Grom clutch
The shift forks are of similar if not better quality than the nice
The gears also use 4 lugs or hubs to transfer power
Timing chain and tensioner system. The problem with this tensioner system is I have heard reports of them not holding up when dual valve springs and a higher lift cam is installed. This is probably because it puts a lot more strain on the chain and idler pulleys.
So there you have it, it looks like it should hold up well in comparison to the nice engines,but we may not really know which are the weak bits until we get up in the 15+hp range
layful:
