Honda TRX250R Forums banner

1 - 15 of 15 Posts

·
Registered
Joined
·
39 Posts
Discussion Starter #1
Neil,

I have a 340 pv motor that i got from ESR a little while back. It has trx9 porting they say. Can you clean it up and port it some more? I just want a good all around cylinder and wondering if you could help me out. i wont really need to send it to you until about april. Just checking sooner rather than later.

thanks
 

·
Premium Member
Joined
·
4,273 Posts
Neil,

I have a 340 pv motor that i got from ESR a little while back. It has trx9 porting they say. Can you clean it up and port it some more? I just want a good all around cylinder and wondering if you could help me out. i wont really need to send it to you until about april. Just checking sooner rather than later.

thanks
Yes, I can when ever your ready.
Best time to do a re-port is along the time a new piston is needed.
Thanks Neil
 

·
Registered
Joined
·
39 Posts
Discussion Starter #3
ok, that is fine. When i do send it to you, can i get the piston from you and about how long is the turn around time? Also, there is no problem with it being supposedly trx9 porting. i have no faith in those big companies and porting.
 

·
Premium Member
Joined
·
4,273 Posts
Yes, I can get the piston kit & realy I would rather do it that way so to get the right size needed.
Normally takes me 3, 4 days porting a cylinder, I take my time. Bore & fitting of the piston, thats another 2 maybe 4 days depending on how pushed the bore man is, but its normally 3 days.
I can keep the porting at TRX9 if thats what your wanting, no problem.
Neil
 

·
Registered
Joined
·
39 Posts
Discussion Starter #5
i dont necessarily want to keep it ported the same. I have heard stories of how these big companies do things, crank them out as fast as possible. I looked at the intake and exhaust ports and they looked ok, but not great at all. I just want a cylinder that is good all around. my question was if since it has trx9 already, would that have taken off too much material, leaving you not enough to do your "thing" so to speak. Just dont want a wild motor that is hard to handle. Give it some thought and like i said, i am in no rush, probably gonna be tearing it down sometime in april, so not too soon.

thanks
 

·
Registered
Joined
·
2,042 Posts
You might want to post ESR's description of the TRX9 porting so that Neil knows exactly what you mean.
 

·
Registered
Joined
·
39 Posts
Discussion Starter #7
cant get anything off of esr's website. All i can tell you is it is supposed to be their midrange port job. trx7 for low, trx9 for mid and trx11 for top. Not much else i can come up with.
 

·
Registered
Joined
·
2,042 Posts
ESR website says, "Our TRX9 cylinder is fully ported for mid-range and top-end
power. The porting allows for terrific performance at higher RPM's, without
sacrificing low-end punch and ridability. Great for most applications."
 

·
Premium Member
Joined
·
4,273 Posts
No problem working with the porting thats already in there.

Normally when most of the big companys port, theres still alot of metal left to work with even after their work is complete.

How you are thinking about the cylinder as it is now, after I get done with it, somebody else may have a problem trying to port it again because I remove quite a bit of metal up in those ports.
Most times, porters will just set port openings at the times they want for the rpm output they are aiming for, but if you want real HP then you got to flow some gas/oil mix up through them & fill the cylinder. Port angles play a big roll as well, that flow has to be directed to the proper place in the cylinder or else it will just go out the exhaust pipe.
You have all sorts of porting work that can be done in a cylinder. Keeping the transfers small, holding the flow down is in a way like gas savings. You can make some amout of power & save gas as well but if you want big power you got to use some fuel.

I been thinking about getting some bumper stickers made saying, If I had my mind on saving GAS constantly, then I would have stayed at the house, cant save anymore than that.
Neil
 

·
Registered
Joined
·
39 Posts
Discussion Starter #13
i see neil. gas savings in not a priority for me. I just want something that will run good and for a 340pv motor this thing is not running all that fast. So hp is number one objective, not saving gas. Although, i dont want a screamer up top, just a good all around duner machine port. if that makes any sense
 

·
Registered
Joined
·
2,042 Posts
I'm I understanding this correctly? If the customer wants the power to remain in the same rpm range and have the same characteristics as in example the TRX9 porting, you would leave the port timing the same, but change the size and flow of the ports. So he'll gain more power throughout the rpm range but not change the rpm range.
 

·
Premium Member
Joined
·
4,273 Posts
I'm I understanding this correctly? If the customer wants the power to remain in the same rpm range and have the same characteristics as in example the TRX9 porting, you would leave the port timing the same, but change the size and flow of the ports. So he'll gain more power throughout the rpm range but not change the rpm range.
Yes in a way then no in another.
You want more power, you got to pack more on top of the piston so when it pops it will push down harder. How much you can trap on top of the piston plays a big part as well, thats where the port angles come in.
With him having the pv, I can cut the exhaust so it will rev a little more for the dunes & then the valve will take care of the bottom end pull.
Neil
 
1 - 15 of 15 Posts
Top