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Discussion Starter #1
pretty simple questoin, im doin mx, what do you think would be better a 310pv or a 350pv, is the 350 worth the extra money, and does it gain much more power, and how about reliability, and lastly, i was planning on running a standard bore LRD if i got a 310, what would be best for the 350, i was thinkin about either a BB LRD or a sparks mx
 

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Discussion Starter #2
???????
 

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Can't tell you from personal experience really, but I do know a couple of pro riders that have used both.

One had the 310PV and preferred the 310 non-PV to it. And he ran alot of WORCS stuff.

The other runs a 350PV and loves it. And DAMN is he fast! I did get to turn a couple laps on the MX track on it and holy shat!!! The power is indescribable. It's the "holy grail" of engines if you ask me.
 

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well, making it short, i had a 310 non pv and my friend has a 330 non pv. the 310 could be run kinda like a 250, wide open but also had power to blast out of turns. my friends 330, was very tiring, and he acutally rode a gear higher to control the power. i think 310 is the way to go for mx....
 

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many say the 350 & 370 are not very long lasting even when built by the best !...& are subject to "blowing up"..for different reasons
many pro's have described a good runing 350 as being "too much power " at times ..
sure as hell you better be ready to spend plenty on the bottom end or be willing to have down time for repairs
 

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i think having some revs is good in MX, the 300 cylinders still rev fairly fast, coupled with a CR ignition, it would make a pretty hot MX motor.
 

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Discussion Starter #8
well a 330 and a 350 cost the same
 

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Well I'm no expert but I would probably go with the 310. If they cost the same go with what you feel comfortable..
 

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....out of all being discussed the 310's most ecomonical to build ,and seem to have the longest life with least problems for most ..
& has the capablity to make very strong usable power if set up well & absolutely doesnt "beat up" on bottom ends as much the others
 

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Discussion Starter #11
well say i got a new oem crank, rebuilt the whole botom end, and got yukon gears, would the 350 still have issues(yes i know this is all costly, im just thinkin about my options)
 

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well you are certainly thinking in the right direction for longer life...

yukon gears ...another story in itself !!
I have discussed yukon gears with a 20 year veteran of building high performance 250R motors for many fast rider & pros including names like Barry Hawk ,Chris borich ,John Natalie right here in Pa...& he didnt subscribe to using them as is ..he claims they are extremely hard(good) & also brittle (bad) ..& went on to show & explain because they are not chamfered / radiused 100% all over on a gear hob as well as OEM type gear they can be prone to splinterring,fracturing & exploding if bought & used as they come ...
I remembering seeing the difference compared to oem gears in his shop & was like hmm....there is a big difference .he's right !
BTW if you ever want to have a motor built by the guy that taught LRD a few things way back when ..just let me know
 

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Discussion Starter #13
well id deffently like to know of this builder, it sounds like hes pretty knowledgeable, so um ya, i want to know lol
 

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i dont know what one is better but i run a 265cc. an it still has like 190comp after a year an it can keep up with the 450's
 

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I'm sitting here scratching my head trying to figure out this not lasting long deal with a big bores :huh: cause we got a 330 that to say the least has been beat to death for the last 3 years. I'm talking about all EDT national events & all of out local events from 3 years.
We must have one in a kuzillion I guess, but its still purring like a kitten.
Neil
 

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Same here Neil, I had a 330 that I picked up from an Pro Open A rider that I abused for close to two years with not a single problem. Never touched it, just raced.
 

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the guy i got my motor from said it has cr250r seals cuz they are smaller and ads higher comp is that true or
 

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I'm sitting here scratching my head trying to figure out this not lasting long deal with a big bores :huh: cause we got a 330 that to say the least has been beat to death for the last 3 years. I'm talking about all EDT national events & all of out local events from 3 years.
We must have one in a kuzillion I guess, but its still purring like a kitten.
Neil
maybe this is all about the builder/mechanic/owner !! :eek: ....or maybe rider ;)
surely you are not denying the bigger bores are hard on bottom ends ?
especailly when guys just slap a big bore on clapped out bottom ends
 

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I'm sitting here scratching my head trying to figure out this not lasting long deal with a big bores :huh: cause we got a 330 that to say the least has been beat to death for the last 3 years. I'm talking about all EDT national events & all of out local events from 3 years.
We must have one in a kuzillion I guess, but its still purring like a kitten.
Neil

I'm with ya Neil. I watched a pro rider out here run his 350PV for two full seasons of WORCS without problem one. And if you know WORCS, you know it's not nice to bikes!
 
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