I need to know the compression ratio for these motors. Many of the online Chinese quad retailers list the c/r, but only as part of the undependable generic info they provide. Ive seen the same specs differ from site to site, so that doesnt help. I want to know if these motors will benefit from a higher octane race fuel, such as 100 or 102. If the compression is less than 10.5:1 or so, then I d say no-- stick with premium unleaded.

 

When I bought the two I have for my kids, they told me that I should only run high octane gasoline in them. I have had no problem with ANY mid-grade (89) or High-Test (premium 92 octane) fuels in either of them. You be the judge.

As far as the compression ratio, I have seen many different c/r for different types, but I have yet to find my particular quads' info. I will say that for the $800 dollars each, I spent, I have yet to find a reason why I should have went ahead and bought a name-brand. They both start every single time with only a single choke and press of the start button.

As you will find in this message, there are some things that need to be looked at, however, lock-tite the bolts.

Here's the link:

Chinese Quad Review

~~mike~~

 

You need to find out what your cranking compression is to make any kind of actual judgement. The compression ratio in the spec is almost useless. At 5100ft my 90cc clone motor has 138psi cranking compression. It is safe to say at that level our midgrade, 87 octane is plenty. The same motor at sea level would probably be in the 160-165 psi range. Since the mid grade at lower elevations is higher octane it would probably be fine. If you put 102 octane fuel in I feel you would need to be closer to 200psi to make any use of it. To much octane will cost you power.