Have any of you guys heard of High Dome pistons? SOmebody told me about them because i wanted to put a Wiseco piston in my 99 recon to get more power but he told me to use high dome pistons because it will give more power. I need to know a web page or catalog where I can reach the company. I also need to know how much these pistons run.

-John Fahey
1999 Honda Recon

 

Why not look into milling the head? Its gonna be alot cheaper. The cost to machine it and a head gasket. Basically the same principal and at a lesser cost.

 

I would not recamend a high dome piston. It increases your compression and you will then have to run a higher octane gas. Also the piston makes all the parts of your engine wear out faster. I had one in mine, The only thing it did was a little more bottom end.and a pain in the *** for the gas. I would not reccamend putting a new piston in just for an increase in power.

 

A higher domed piston will increase compression -- typically giving you a little better throttle response and a bit more horsepower.

On the downside, increased compression requires better fuel, and typically runs a little hotter.

You could go to 10.5:1 compression on the Recon and still run on premium pump fuel -- unless you take the quad in the mud and do lots of slow speed aggressive riding -- in which case, I'd stick with stock compression.

Milling the head on a four stroke is not smart -- why? 'Cause you have a timing chain which would be too long after you mill the head. Not good. Milling the head works well on a two stroke tho.

Bottom line? If you have to replace the piston anyway, a slightly higher compression will give you a bit of a boost -- if you're thinking about pulling it down and installing the higher comp piston just for more hp, I'd go for an aftermarket exhaust first -- it'll give you more bang for your buck.

Pam

 

Well from what I have heard from talking to the experts. A flattop piston with the corresponding head modifications would be your best bet for more power. This is because of the mechanical advantage that the flat top piston has over the domed pistons. A higher percentage of the IMEP (indicated mean effective pressure) is transmitted to generate more torque. Think about it when you push your lawnmower (well some of us push it) the less angle you push with the easier it is to move the lawnmover forward. If you were really short and could have the bar flat then all your force would be to push forward not some of it down and some forward. I have seen flattop pistons at eric gorr's webpage (forward motion) he is far more of an expert than me and could answer your question completely as to which piston is best for your machine.

CT250R (1988 CT250R & 1986 CT310R)