TRX250R.ORG
Workshop => Engine and Bottom End => Topic started by: Victork on July 05, 2013, 09:10:48 AM
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Right now I have a 350 pro x with a long rod. I'm wondering how I'd do with a good porting with 4 mill crank, custom pipe and lectron. If that would get me going good I might wait on a cub.
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Has the cylinder already been ported?
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CT standard dune port but I want more top end...
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Not sure what CT sets the port timings too on a dune port, but if I had to guess you will end up with at least a drag port just by putting in the 4 mil crank. You'll want to see what your timings are and then go from there to determine if you can go with the 4 mil or not. You may have to stick with the stock stroke and then have the cylinder ported again for more top end.
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ask troybilt about his saber cylinder. i believe its for sale. that will give you some top end.
john
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adding a +4mm crank and a full port job from someone who i would say is a master carver could net you 5-10whp if your building a duner bike. if your wanting to add a lectron and a drag pipe with alky you could gain more, probably upto 15whp depending on who builds and setups your stuff.
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I use 110 or 114 sonoco. I don't want to tear down until October so I can ride. I was thinking about keeping my set up as its very good in the woods and getting a ATC and doing a puma. I need something top end for play and some hill climbing.
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+4mm crank would be the cheaper route with any cylinder you choose, as the +6mm cranks go up in price very fast.
a good running 431 puma will put a smile one anyones face that doesn't have a saber already =P
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I don't know how ct calls this a mid/top port because it feels like a bottom/mid motor. Must be the lrd pipe. I'd I can make a big difference with what I have now I will.
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CT porting is decent at best. 350 is a great cylinder to run around on. Had one for a while (CT) in a TRX I had. Was a blast to ride. Its a play motor, MX, Dunes, trails, etc...
Have a decent Honda builder work over the cylinder for porting and get yourself CR ign...this will wake it up.
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Victor whats the goal here ? just more power?
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Yes, I'm wondering how well I'd do with a new top end, striker crank, custom pipe and lectron
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k so is this a duner, or a drag bike? or? do you do alot of part throttle riding or only wide open or idling?
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I do it all and seem to always be 3/4 to wide open. I need to do some trails but focus is on play drag, hill climb, dirt roads.
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then you will probably like the lectron.
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I'm also kind of curious how much a sparks TT will change my power band. Lasher 19 has one I was gonna get it still waiting for a reply. He lives 20 minutes from me
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pipes can want huge jetting changes so just bolting it on you might not feel the difference, might have to rejet.
for instance i went to the dyno with my puma with the shearer inframe it wanted a 175/52 4th clip on needle
put on led it wanted a 170 mj 52 pilot and 3rd clip horsepower gain was 8 horsepower difference in the two pipes
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I've been building my own r motors for ten years now but this 350 is the biggest I've had so far. I know you guys have already stepped it up so I'm glad I have your opinions.
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CT porting is decent at best. 350 is a great cylinder to run around on. Had one for a while (CT) in a TRX I had. Was a blast to ride. Its a play motor, MX, Dunes, trails, etc...
Have a decent Honda builder work over the cylinder for porting and get yourself CR ign...this will wake it up.
I agree, I just put the CR ignition in my ESR 350 yesterday and it made a great deal more power and a lot wider/smoother curve.