Honda TRX250R Forums banner

1 - 14 of 14 Posts

·
Premium Member
Joined
·
4,273 Posts
is there an advanatge to stroking a cr 500? is it worth the money?
Oh my god, seriously, that things a tractor off the show room floor.
I guess it could be done, but just a good port job would turn it into more than a hand full to handle.
I wouldnt be surprized if one couldnt take that engine & power a small car of some type, HUMMMMMM wonder how it would do in a Legend race car.
Neil
 

·
Registered
Joined
·
722 Posts
Oh my god, seriously, that things a tractor off the show room floor.
I guess it could be done, but just a good port job would turn it into more than a hand full to handle.
I wouldnt be surprized if one couldnt take that engine & power a small car of some type, HUMMMMMM wonder how it would do in a Legend race car.
Neil

neil, the CR500 are used in outlaw karts....mini sprint car....i would not stroke it, i "think" that they actually de stroke. i remember somone telling me thst was the hot set up.
 

·
Registered
Joined
·
3,565 Posts
neil, the CR500 are used in outlaw karts....mini sprint car....i would not stroke it, i "think" that they actually de stroke. i remember somone telling me thst was the hot set up.

yes ^ thats sounds correct but I am not 100% positive on it
I do remember seeing cr500 topends / motors on mini sprints ..just not sure everyone de strokes em ..seems like maybe I heard they do mods to the trans too
 

·
Premium Member
Joined
·
4,273 Posts
yes ^ thats sounds correct but I am not 100% positive on it
I do remember seeing cr500 topends / motors on mini sprints ..just not sure everyone de strokes em ..seems like maybe I heard they do mods to the trans too
Trans mod is no clutch in the mini sprints. I could understand them being D stroked as well, got to keep that sprint turned up & I guess even the go kart.
Neil
 

·
Registered
Joined
·
4 Posts
Discussion Starter #6
Trans mod is no clutch in the mini sprints. I could understand them being D stroked as well, got to keep that sprint turned up & I guess even the go kart.
Neil

i'm building this motor for 1/8 mile drags. cool head setup, 48mm hv lectron alky carb, drag pipe etc. going into a three wheeler frame
 

·
Registered
Joined
·
42 Posts
you can get a balanced +3mm stroker crank for a little over $400. if you are looking for the most Hp i would definately get it and the balancing will help the vibes. the only reason the sprint car cr500s are de-stroked are to get them to rev out higher. i heard of people running newer cr250 ignition and that helps out a lot to get them to rev if you are worried about that.
 

·
Registered
Joined
·
4 Posts
Discussion Starter #8
you can get a balanced +3mm stroker crank for a little over 0. if you are looking for the most Hp i would definately get it and the balancing will help the vibes. the only reason the sprint car cr500s are de-stroked are to get them to rev out higher. i heard of people running newer cr250 ignition and that helps out a lot to get them to rev if you are worried about that.

i already have a cr 500 in the three wheeler. this is a spare motor i'm getting ready to build. and to be honest my old atc 250r vibrates way more that my atc 500. it have a cr 250r ignition, nology coil and wire. after contacting crankworks the total will be $530 plus shipping-stroked, lighten and balanced
 

·
Registered
Joined
·
769 Posts
i don't think it's possible to balance a single cylinder rotating assembly throughout the whole powerband. for a certain part of it, yes(ie: low range or top end) but not from idle to peak rpm. might want to look into what rpm range crankworks is balancing it at.


and what times/mph is that 3 wuller running?
 

·
Registered
Joined
·
42 Posts
i already have a cr 500 in the three wheeler. this is a spare motor i'm getting ready to build. and to be honest my old atc 250r vibrates way more that my atc 500. it have a cr 250r ignition, nology coil and wire. after contacting crankworks the total will be 0 plus shipping-stroked, lighten and balanced

heres the crankworks page for crank mods

http://www.crankworks.com/motorcycle-services.html
 

·
Registered
Joined
·
722 Posts
i don't think it's possible to balance a single cylinder rotating assembly throughout the whole powerband. for a certain part of it, yes(ie: low range or top end) but not from idle to peak rpm. might want to look into what rpm range crankworks is balancing it at.


and what times/mph is that 3 wuller running?
if its balanced it should be pretty smooth at any rpm range, balanced is balanced... how would you ake it more balanced at a certain rpm?? common sense would think then it would be WA off balanced at another rpm?? i could be totally wrong here..... just using my head
 

·
Registered
Joined
·
769 Posts
here's my thinking FWIW(nothing?) a v-anything can be balanced and an inline can be balanced cause there's something counteracting a lone cylinder. if the crank is out of balance at at low rpm's, say 1000-3000 rpm's, and they add/subtract weight to get it balanced what are they gonna do if it's out of balance in the upper rpm's? add/subtract weight? then where does it leave you back in the lower rpm's? since we don't have harmonic balancers or multiple sets of counterweights to drill holes into/fill holes up, or grind off of we're limited to how much you can do to a lone rotating assembly. if crankworks gets the flywheel and balances it with the crank, i can see that helping some, but if they don't thats another variable to throw everything out of whack. plus the harmonics go straight from the crank to the clutch basket and counterbalancer(on the 250r motor) which puts a couple more variables into it all(maybe?).
i know the cr500 doesn't have a counterbalancer, just using a 250r for example. maybe i'm all wrong in my thinking????????????
 

·
Premium Member
Joined
·
4,273 Posts
Single cylinder crank balancing, has been discused on every 2 stroke site I go to. Has had input from people all over the world from those that have tryed every way possible to balance them. Test have found it only helped at a small range of rpms, not a full range.
Although balancing didnt cover the entire rpm range, some balancing effort to a stock crank was better than none at all.
Neil
 

·
Registered
Joined
·
4 Posts
Discussion Starter #14
Single cylinder crank balancing, has been discused on every 2 stroke site I go to. Has had input from people all over the world from those that have tryed every way possible to balance them. Test have found it only helped at a small range of rpms, not a full range.
Although balancing didnt cover the entire rpm range, some balancing effort to a stock crank was better than none at all.
Neil
not trying to cause any problem but the topic was
"is there an advantage to stroking a cr 500 crank? an is it worh the money?"
 
1 - 14 of 14 Posts
Top