Head porting?

[kx_guy86]

My bike has lamson? head porting. I've run half race gas has 92. I cannot afford race gas anymore. Would it be ok to run straight regular?

 

[bclapham]

probably not, what bike is it, maybe you could use an extra head gasket or even see if someone makes a thicker gasket

 

[kx_guy86]

99 KX 125

 

[kx_guy86]

as long as it doesn't ping and stuff that means its fine right?

 

[bclapham]

maybe, maybe not? i suppose there is only one way to find out, but if it goes wrong it might cost more than running the race gas

 

[kx_guy86]

well, I guess I could buy octane booster additives right? Lot cheaper than race gas.

 

[cujet]

Octane booster is always an alternative. However, you must make sure that the octane booster you use actually raises octane. Some products such as 104+ used to contain MMT which was effective in raising octane. 104+ now contains NO MMT and therefore is not nearly as viable an octane booster. Make sure to use a product with known octane boosting properties. My personal opinion is that MMT is among the most effective octane boosters for 2 stroke engines. Toluene can also be used, however as some have mentioned previously, large amounts can tend to reduce throttle response.

I suspect that quality super unleaded may be enough for your needs. One quick, somewhat inaccurate and dirty way to get a handle on octane needs is to do a static compression test on an engine in good shape. If you are getting 200PSI cranking compression, it is a good bet you will need high octane. If your compression is 160PSI or less it is likely that super unleaded is sufficient. I believe that the in between is a grey area and subject to other operating factors.

Chris

 

[mxrider1001]

hey kx guy what happened our thread about the bike pics? LOL u gonna play that 12 bucks?

 

[kx_guy86]

I had a compression test done and my bike had 180 pounds. I guess that I will try premium unleaded and if it doesn't run good either put in octane booster or mix 50/50 with race gas. :( LOL I guess they didn't like that thread!

 

[tomoad]

i found some vp racing fuel octane booster at autozone. which contains mmt. and it is a 20 oz bottle, how much of this do i add to a tank full 2 gal.. i have an 03 cr 250 and i have the cylinder and head sent off for porting/head work. race fuel is hard to come by where i live.

 

[FDR492]

So if i put some of that octane booster in my bike will it make it smell liek im running race fuel? Cause i LOVE that smell

 

[kx_guy86]

i just went to my local dirt bike dealer and picked up some "trick" octane booster. It comes in a white metal can and you ad three ounces per gallon. Seems to work great!