dyno sheet on a 250r ported by rb racing in michigan

[morse250r]

this was my best run after tweeking the timing on my cr 250 ignition this has rb racing here in michigans port work done
its a drag port its a 353 cc

[8686]

That's it? Just kidding. Looks like a strong engine.

[2muchquad]

that thing makes at least 50hp or more for about 2k rpm!thats crazy,talking bout'a wide powerband:macho :eek2:

[machwon]

Definitely a good runner here and it doesn't have a power valve either. I thought the pit crew did an awesome job tweaking that timing for the improved No. 6 run in just under 8 minutes. The torque was awesome as well as I've seen some powervalve 350's in the lower 30's on torque. I couldn't believe the 44mm carb we tried didn't do a thing on this bigger motor. I thought for sure it would want more carb.

[morse250r]

thanks for all the work robert ..... it changed my mind about lectrons ill have to still to the 40.5 kehin for now couldnt be happier with this build and all the hard work you put into it thanks again !!

[machwon]

Johan, just thought I would update the post after today's dyno pulls. It's kinda funny looking back how we didn't like the Lectron, now it has the bigger one! Thanks for coming by today and all those you have sent my way. I can't wait to see the times you and Jim can put down with the motors.

[machwon]

Not sure if this is your wifes or your duner 310. Here the runs from that motor.

[derby]

Hey Robert what size lectron and fuel did you end up putting on the 370? Mid 70's is about as good as a 370 gets.

[morse250r]

lol if you ask the wife its hers....
thats a 310 40.5 kehin, trx 5, esr air box elim, pump gas, dune port motor

thanks again robert for your hard work into my set up, i couldnt be happier. As it stands its a 363cc on alky. the size of the lectron is a secert ! somewhere in the 4o's:D

[atv fan 28]

Those are some nice numbers! I wished i could get my 310 6mil on a dyno and see what it has?

[jcs003]

any more info on the 310? with all due respect... from what i see thats not very impressive. macdizzy has a stock cylinder putting out 53hp if i remember correctly.

[8686]

Originally posted by jcs003
any more info on the 310? with all due respect... from what i see thats not very impressive. macdizzy has a stock cylinder putting out 53hp if i remember correctly.

His info is listed a couple posts back.

No offense, but what are you talking about? Ever had your quad on a dyno before? Those are very solid numbers for a dune ported 310 on pump gas. Wonder what the porting is like on that stock cylinder on Macdizzy? Wonder how much compression it has? Wonder how narrow the powerband is? What is the actual displacement? OOF drag pipe? Running well over 50 rwhp for a setup like Johann's 310 IS impressive. Dyno's are humbling pieces of equipment. Bob at RB Racing does great work. Post up your own info and dyno sheets some time.

[jcs003]

Originally posted by 8686
His info is listed a couple posts back.

No offense, but what are you talking about? Ever had your quad on a dyno before? Those are very solid numbers for a dune ported 310 on pump gas. Wonder what the porting is like on that stock cylinder on Macdizzy? Wonder how much compression it has? Wonder how narrow the powerband is? What is the actual displacement? OOF drag pipe? Running well over 50 rwhp for a setup like Johann's 310 IS impressive. Dyno's are humbling pieces of equipment. Bob at RB Racing does great work. Post up your own info and dyno sheets some time.

here is the info you requested:

http://www.macdizzy.com/sixtynine.htm


also, he wasnt specific on what was done to it. just basic info.

another thing. i run an XC bike so big hp numbers dont mean a thing.

[morse250r]

theres really no need to go into more detail it is what it is..... i went to the dyno brought this one along and made 1 pull no adjustments or anything im happy with it.


like i stated above in a post its only a duner . .

[machwon]

Originally posted by atv fan 28
Those are some nice numbers! I wished i could get my 310 6mil on a dyno and see what it has?

ATV fan 28, what kinda numbers do the 431 puma's put down, any idea?

[8686]

Originally posted by jcs003
here is the info you requested:

http://www.macdizzy.com/sixtynine.htm


also, he wasnt specific on what was done to it. just basic info.

another thing. i run an XC bike so big hp numbers dont mean a thing.

Good link. Sweet info. Also, even though you "run" xc (run or actually race?), I think it's a little stretch to say hp doesn't mean a thing.

Morse250r's 310 is a rather mild example. Dune port on pump gas making 53 rwhp? Come on. That's healthy.

[jcs003]

Originally posted by 8686
Good link. Sweet info. Also, even though you "run" xc (run or actually race?), I think it's a little stretch to say hp doesn't mean a thing.

Morse250r's 310 is a rather mild example. Dune port on pump gas making 53 rwhp? Come on. That's healthy.

first. i dont race anymore. but, i live in the NE and it is XC style terrain. the H,p. numbers are irrelevant. a stock 250r cylinder is plenty fast. its more important that the bike is properly set-up to be consistent.

[Grande Huevos]

yeah a 53hp R is VERY Healthy!!! especially on a 310! A stock cylinder producing those numbers lol lets see some dyno sheets!!!

[jcs003]

Originally posted by Grande Huevos
yeah a 53hp R is VERY Healthy!!! especially on a 310! A stock cylinder producing those numbers lol lets see some dyno sheets!!!

i just posted the dyno sheets. look a few post back.

http://www.macdizzy.com/trx_dyno.htm

[atv fan 28]

Originally posted by machwon
ATV fan 28, what kinda numbers do the 431 puma's put down, any idea?

To be honest with ya, i dont have a clue. I just bought the K&T 431 Puma. Its being shipped out tomorrow.

[derby]

Originally posted by atv fan 28
To be honest with ya, i dont have a clue. I just bought the K&T 431 Puma. Its being shipped out tomorrow.

My first dyno pull on my puma was 62hp just like it came from my builder. I played with it for a long time and the best run was 76hp on gas. Took nearly 2 years to get it there.

I have seen 3 different dyno runs of 96-98hp on the puma with alky. The out of frame puma pipes make about 3-4 more hp than the inframe does.

[morse250r]

those are some good numbers on your puma

what size carb are you running on gas ?

[machwon]

Originally posted by derby
My first dyno pull on my puma was 62hp just like it came from my builder. I played with it for a long time and the best run was 76hp on gas. Took nearly 2 years to get it there.

I have seen 3 different dyno runs of 96-98hp on the puma with alky. The out of frame puma pipes make about 3-4 more hp than the inframe does.

That's pretty good Derby, you're must have got one of the first Puma's? It's not as simple as some make it to get into the 70's. Going to alky and that other pipe you'll be in the 80's for sure. I would think the 96-98 hp guy has put in some serious tuning time and has an unlimited supply of parts to try. This motor posted here got just over 70 on gas at first, this time it was alky for the 75, and yes it was about 2 years later.

[machwon]

Originally posted by jcs003
i just posted the dyno sheets. look a few post back.

http://www.macdizzy.com/trx_dyno.htm

It's interesting that they used a model 150 dyno for their pulls. After looking it up because the software looks totally outdated, those were for motorcycles so it may not be apples to apples. It might show more power because they likely adapted a single rear wheel set up to do the testing? jcs003, If you are ever in MI, stop by and I'll let you have a free dyno run for your 250r.

[derby]

Originally posted by morse250r
those are some good numbers on your puma

what size carb are you running on gas ?

Started out with a 41.5 tmxx. Then went to a 44 lectron and then what ended up staying on the bike is a 48HV lectron. I sold the puma motor and am starting over with a new puma. I was going to have to use a different bore and stroke than my previous puma and I could not see busting up a $750 crank to just rebuild with another $500 so it just made sense to start over from scratch with new cylinder/head/crank.

Morse have you ridden the bike since you dynoed and changed the carb?

[morse250r]

no i havent ridden it since friday there is snow on the ground here yet !! and the dunes open this weekend. it will me more towards middle of may

[redrider419]

Here's my 297cc built by Arlan.
Paper Dyno was smudged so had him email me another copy.

[morse250r]

nice numbers what kind of gas pipe and carb ?

[redrider419]

Its pump/110 mix, lrd adjustable, and a keihn 38

[machwon]

What kind of dyno does LED have?

[redrider419]

I'm not too familiar with dyno types but i believe its a dynojet.

Here's a video of his dyno (pdxbigfoot's old R)

http://www.youtube.com/user/Revseven7#p/u/11/kRLw57rS-n4

[machwon]

It's hard to tell what brand by the video. The software is not dynojet and it appears to be a single wheel dyno.