Whats the best piston and engine mods

[AL-Kaholic]

Whats the best brand of piston and should i get the ports polished on my 06 yz125

 

[hot125mod]

I like wiseco, because they are forged aluminum and have a .090 dome to gain a little compression. I have a rm 125 that is a heavy mod, and i needed a new piston after 8-10 hours. Which is pretty classic of a 125, because you have to wring the snot out of them. Its a blast though.

 

[AL-Kaholic]

Oh sweet thanks, what did you do to your 125 to mod it?

 

[hot125mod]

Wow I don't know where to start its hard to remember everything but here goes Ported cylinder, cut head .022 on the deck 10 on the squiush with about 190 lbs of compression, poilished combustion chamber, spark plug lug on the top of the head is cut flat with a spark plug spacer and a wiseco prolite piston, lightened crank, hot rod, v force reed cage, matched cases, kehin 38 pwk carb w/ pro-action vortex mod matched intake manifold, blended clutch bell polished air boot side and debured on the rest. spooned pro-circuit pipe and r304 shorty silencer. JD Race ignition from pro-circuit.Cometic gaskets Maxima 927 and VP Ultimate 2 at 32:1. spot on jetting 162 main 45 pilot stock needle on the 4th clip a/s 1.5, Pro-action suspension This bike is a buck and a quater on roids. I can run with stock 250f's. Its hard though, all depends on the rider. I may have forgetten a thing or two but I think thats it. :nod:

 

[stumanarama]

my dad spoke of doing the port polish on his old 360 husky himself back in the 70's, i was wondering if it is still as simple as smoothing out with a dremel, all those imperfections in the ports from the original casting of the cylinder , or if it is complex enough that you need to have a shop do it? by the way, that 125 sounds like a real runner, what does it do to other 125s?

 

[hot125mod]

Its quite a bit faster. I really need to change my gearing it has renthal front and rear chainwheels 13/51 I dont like it, suggestions anyone stock is 12/49 I think. For what I have in this motor I could buy another 125. yes you can clean up the ports with a dremel be careful and you better have a steady hand. If it is your first time with a rotary tool I suggest sending it out or someone local if it is just a cleanup.

 

[stumanarama]

hot125: ive had hours with the dremel to gain a steady hand, i was just curious about it for future referrence, my bike has more than a sufficient amount of power at this point, so ill just leave it the way it is for now,
thanks
al: however in answer to the original question, if i were on a 125, i probably would get the ports polished, just to give it a little something extra

 

[Rich Rohrich]

i was wondering if it is still as simple as smoothing out with a dremel, all those imperfections in the ports from the original casting of the cylinder ,

The surface texture of the port has no bearing on performance. Polishing ports is just eye candy for nitwits who don't know any better. ;)

 

[hot125mod]

rich what does eric charge to port a 2 stroke cylinder. i have another one and i want to compare his work to others

 

[Rich Rohrich]

Current prices are available at www.ericgorr.com

 

[DougRoost]

Trust me, send it to Eric rather than trashing a good engine. He knows more about flows, transfer ports, etc. than anyone. It's about opening some ports while epoxing off others on a 2 stroke. And though a 2 stroke is quite simple in number of parts, the "timing" of the engine is mechanical since it has to do with the design of the relative position of the various ports and piston to each other.

 

[hot125mod]

I cant seem to find it. I have been to his site a lot I clicked on the 2 stroke service icon and there are no prices for porting. HELP

 

[todd36]

I think a stock bike with dialed in jetting and suspension not to mention fresh tires and clutch will just about beat a ported bike every time. Just my opinion

 

[hot125mod]

nothing will match up to one of erics bikes he is the ****.

 

[96speed]

I recently sent my stock YZ125 engine to Eric Gorr for a big bore kit and a crankshaft replacement. Other than an FMF fatty head pipe the bike is basically stock. I went from getting raped by my friend's CR250 to almost hanging neck and neck with him on at 40-60mph (hard to tell without a speedometer :)).

I am extremely satisfied with the way the bike runs. I haven't even tried to rejet the carb or anything (running the FMF spec jets). The bike just works, period.

 

[Pete Payne]

Rich Rohrich Quote:
Originally Posted by stumanarama
i was wondering if it is still as simple as smoothing out with a dremel, all those imperfections in the ports from the original casting of the cylinder ,



The surface texture of the port has no bearing on performance. Polishing ports is just eye candy for nitwits who don't know any better.

Rich,
Ya just gotta love it !!! As long as I have been around MX the above statement never ceases to come up . Just like "can you change my power"band", Isn't it a part in the engine ".

Pete

 

[Rich Rohrich]

Pete - Some things are just constants in the motorcycle world. :)