Hotizontal Engine Codes

Ascot500 · 12-18-2023, 08:17 AM

OK. I am looking for a horizontal clone clone engine for a project with these specs:
90-110cc
Kick start
Semi-auto 4 speed
N-1-2-3-4 pattern

As I peruse on-line the offerings, I see a lot of contradictions in listings, like in one place saying it's a 4-speed pit bike engine while in the specs it says R-1-2-3
Or seeing a clutch lever on the case when it says semi- auto

So how can I be sure an engine has what I want?
Do the numbers stamped below the sprocket have a decipher code?

dirtbkr188 · 12-18-2023, 08:57 AM

Supposedly, only the engine displacement and bore size can be deciphered from the engine VIN...but.... The Chinese engine manufacturers take great liberties when branding their engines. They aren't always what they say they are.

Ascot500 · 12-18-2023, 09:00 AM

Thanks - this is great information

dirtbkr188 · 12-18-2023, 09:15 AM

A case in point...
I have an engine here with the engine VIN - TZH152FMH - which, according to the chart above, has a 52mm bore and 110cc displacement. I know the stroke is 49.5mm, and when the formula is applied, here is the result.
5.2 x 5.2 x 4.95 x .7854 = 105.12cc displacement

The thing is, the cylinder has a 90cc casting on it, and when I removed the head, I found that the bore size was only 47mm, not 52mm, as the engine VIN states. Applying the formula to that number -
4.7 x 4.7 x 4.95 x .7854 = 85.87cc displacement

As I said above, they are not always what they say they are.

Mudflap · 12-18-2023, 10:10 AM

Quote:

Originally Posted by dirtbkr188

A case in point...
I have an engine here with the engine VIN - TZH152FMH - which, according to the chart above, has a 52mm bore and 110cc displacement. I know the stroke is 49.5mm, and when the formula is applied, here is the result.
5.2 x 5.2 x 4.95 x .7854 = 105.12cc displacement

The thing is, the cylinder has a 90cc casting on it, and when I removed the head, I found that the bore size was only 47mm, not 52mm, as the engine VIN states. Applying the formula to that number -
4.7 x 4.7 x 4.95 x .7854 = 85.87cc displacement

As I said above, they are not always what they say they are.

The CG engine in my old quad was coded as 71mm bore but I measured it as 63mm so I agree they are sometimes miscoded.

12-18-2023, 08:17 AM	#1
Ascot500 Join Date: Apr 2007 Posts: 90	Horizontal Engine Codes OK. I am looking for a horizontal clone clone engine for a project with these specs: 90-110cc Kick start Semi-auto 4 speed N-1-2-3-4 pattern As I peruse on-line the offerings, I see a lot of contradictions in listings, like in one place saying it's a 4-speed pit bike engine while in the specs it says R-1-2-3 Or seeing a clutch lever on the case when it says semi- auto So how can I be sure an engine has what I want? Do the numbers stamped below the sprocket have a decipher code? Last edited by Ascot500; 12-18-2023 at 12:18 PM.
	0

12-18-2023, 08:57 AM	#2
dirtbkr188 Join Date: Aug 2009 Posts: 574	Supposedly, only the engine displacement and bore size can be deciphered from the engine VIN...but.... The Chinese engine manufacturers take great liberties when branding their engines. They aren't always what they say they are.
	0

12-18-2023, 09:00 AM	#3
Ascot500 Join Date: Apr 2007 Posts: 90	Thanks - this is great information
	0

12-18-2023, 09:15 AM	#4
dirtbkr188 Join Date: Aug 2009 Posts: 574	A case in point... I have an engine here with the engine VIN - TZH152FMH - which, according to the chart above, has a 52mm bore and 110cc displacement. I know the stroke is 49.5mm, and when the formula is applied, here is the result. 5.2 x 5.2 x 4.95 x .7854 = 105.12cc displacement The thing is, the cylinder has a 90cc casting on it, and when I removed the head, I found that the bore size was only 47mm, not 52mm, as the engine VIN states. Applying the formula to that number - 4.7 x 4.7 x 4.95 x .7854 = 85.87cc displacement As I said above, they are not always what they say they are.
	0