What Engine Is This?

[qtband]

I got this with my new kart project. It has no identification on it that I can see. Is it a 5hp or 6.5hp? The guy couldn't remember. It looks about the same as my other 6.5 clone. Maybe the color is different for different horsepowers???
Ken

 

[Blazkowiez]

Look under the gas tank at the block, those will be your casting marks to tell you what size it is on a Honda. Alternately I assume the Chinese will mark theirs similarly.

 

[rkcarguy]

Under the tank, or somewhere on the crankcase casting should state the CC's.
Looks like the caroll stream 6.5HP clone to me, just a guess.

 

[r_chez_08]

If you can't find markings you could take off the head to measure bore and stroke.
Alternatively you could put it up against your 6.5hp for size. If I am correct, the 5.5 is a 6.5 with a decked block and shorter stroke crank, e.g. the 5.5hp has less stroke than the 6.5 (along with some other small differences). If the cylinder seems the same it is probably a 6.5hp. If it is shorter it is probably a 5.5 or 5hp.

 

[Doc Sprocket]

According to my Honda manual

Model------------Bore----------------Stroke

GX160-----------68mm----------------45mm
Gx200-----------68mm----------------54mm

My manual does not list compression ratio information, which would reveal whether the gx160 is "decked".

 

[sparkyjuice]

looks similar to an older honda gx120 that we used to run in our 1/4 midgets as a kid.

 

[r_chez_08]

According to my Honda manual

Model------------Bore----------------Stroke

GX160-----------68mm----------------45mm
Gx200-----------68mm----------------54mm

My manual does not list compression ratio information, which would reveal whether the gx160 is "decked".

I dont mean that the stroke os the only difference with the 160. It also has a different head (14cc old model, 18cc new model vs 22cc clone) and I think the 160's have a flat top piston as stock. Some of them anyway.

The 160 has a 9.0:1 compression ratio and the 200 has a 8.5:1 ratio according to the honda website.