Dyno'ed the Elsinore mt250

Discussion in '2 smokers' started by Dirtstar1, Sep 26, 2012.

  1. Dirtstar1

    Dirtstar1 Human torpedo

    Joined:
    Dec 9, 2010
    Oddometer:
    121
    Location:
    Almost mexico I.B.
    After a long search I finally got me an mt250. Being that I grew up in lake Elsinore, one would say its my god given right to ride an Elsinore. Lol after many searches and a long debate about actual HP I decided to take the MT250 to Full Throttle Powersports in santee ca. They have a dyno jet. I asked them to do a baseline pull for hp and torque so we could compare after putting on a CR top end. This where it gets fun. Mike from full throttle at the controls of the mt250 warmed up the bike while setting the perimeters of the dyno. Next he ran through the gears until he hit 4th. Once in 4th gear he rolled on the power. The old bike sounded great! With a small puff of 2stroke the bike cleaned out fast and revved up to 7600 RPM's before flatlining. Since this was only a run for test he reset and ran it up again. With crisp throttle response the old elsinore started to sing that piston ported note it was known for. When it was all said and done, the 37 Year old bike with 2100 miles on it made a solid 17.6 hp with 15 foot lb of torque. I'll post pics of the dyno sheet later. It's no powerhouse but it does make a good wide powerband.

    Mike at full throttle powersports took great care of me and my grand daddy of dualsports. I'd recommend his services anytime.

    Ryan Kennelly
    #1
  2. Dirtstar1

    Dirtstar1 Human torpedo

    Joined:
    Dec 9, 2010
    Oddometer:
    121
    Location:
    Almost mexico I.B.
    I said I'd ad a pic or two.
    <a href="http://s29.photobucket.com/albums/c285/dirtstar1/?action=view&current=242AB58A-A640-4ABD-ACE8-7CBC0D156CE2-225-000000178F3AC57D.jpg" target="_blank"><img src="http://i29.photobucket.com/albums/c285/dirtstar1/242AB58A-A640-4ABD-ACE8-7CBC0D156CE2-225-000000178F3AC57D.jpg" border="0" alt="Photobucket Pictures, Images and Photos" /></a>
    <a href="http://s29.photobucket.com/albums/c285/dirtstar1/?action=view&current=F6FB2C11-6BED-43D4-BC38-99BB3E166C5C-225-00000017384B5150.jpg" target="_blank"><img src="http://i29.photobucket.com/albums/c285/dirtstar1/F6FB2C11-6BED-43D4-BC38-99BB3E166C5C-225-00000017384B5150.jpg" border="0" alt="Photobucket Pictures, Images and Photos" /></a>
    <a href="http://s29.photobucket.com/albums/c285/dirtstar1/?action=view&current=15A92D68-BAD5-46CD-9398-008E840BAA39-225-0000001759C515A9.jpg" target="_blank"><img src="http://i29.photobucket.com/albums/c285/dirtstar1/15A92D68-BAD5-46CD-9398-008E840BAA39-225-0000001759C515A9.jpg" border="0" alt="Photobucket Pictures, Images and Photos" /></a>
    #2
  3. bluebye

    bluebye Skin it back

    Joined:
    Mar 23, 2004
    Oddometer:
    1,445
    Location:
    'neckville is where you hang your hat, Rolling
    Thanks. That's way cool.
    #3
  4. brucifer

    brucifer Long timer

    Joined:
    Nov 27, 2007
    Oddometer:
    2,686
    Location:
    Eureka, Ca.
    Yes, very cool. I'm interested to see how much of a difference the CR top end will make.
    As I recall, the early ('74-'76) CR250 Elsinores were rated at 33 hp, I would assume at the crank.

    My uncle bought a new leftover '74 CR250 still in the crate in '76. That was a bad a$$ bike. They had a reputation back then of hurting people who didn't give them the respect they deserved. :lol3
    He let me ride it one time when I was about 10. What a freakin' animal! It certainly left an impression in my motorcycle addled 10 year old mind.
    #4
  5. Dirtstar1

    Dirtstar1 Human torpedo

    Joined:
    Dec 9, 2010
    Oddometer:
    121
    Location:
    Almost mexico I.B.
    You are welcome. We all assumed the MT250 would make similar Horsepower to the CR250m. Since their is no info anywhere on the MT250's HP I figured let's find out. The first time I rode it I said to myself, there is no way this has 28 HP!
    #5
  6. Dirtstar1

    Dirtstar1 Human torpedo

    Joined:
    Dec 9, 2010
    Oddometer:
    121
    Location:
    Almost mexico I.B.
    You may be right at 33hp at the crank. Everything I could find pointed at 28 hp at the wheel. My guy Allen at CT racing thinks we can break 30HP at the wheel with a DG pipe, CR head, piston, and cylinder, once we reset the squish and give it a modern combustion chamber for today's pump gas.

    This all started when my girlfriend wanted me to get a 250 to ride with her. She rides a WR250x I chose the Elsinore to give her a handicap of suspension and brakes. Imagine my disappointment when I found out I was 10 hp light against her WR.... Lol
    <a href="http://s29.photobucket.com/albums/c285/dirtstar1/?action=view&current=1CD70823-3F20-4370-A0B6-03B8F0D6BDDA-225-000000173BB3E55C.jpg" target="_blank"><img src="http://i29.photobucket.com/albums/c285/dirtstar1/1CD70823-3F20-4370-A0B6-03B8F0D6BDDA-225-000000173BB3E55C.jpg" border="0" alt="Photobucket Pictures, Images and Photos" /></a>
    #6
  7. Foot dragger

    Foot dragger singletracker

    Joined:
    Dec 27, 2006
    Oddometer:
    13,837
    Location:
    chico,just below rag dump(nor-cal)
    Oh Yes,the memories come back. My dad was my sponsor when I was 16 or so,we went down and got a brand new 74 CR250 Elsinore. I wanted a new Pomeroy Replica 250 Bultaco but the Honda was 100.00 less.
    I was used to Bultacos as I had been racing a 200 for a couple years.
    That Elsinore showed me who was boss more then a couple times.
    I missed a shift on it one day in the heat of battle,the engine spun up so fast it destroyed the cases/cylinder,the rod snapped and spun around leaving a wide swath of destruction.
    One brand new engine in the crate later and we were back in business. The chain popped off while a light kid was riding it,broke the gearbox all to hell but we saved the engine at least.

    It also had an odd habit of sticking the throttle wide open,it did this when new,the shop couldnt figure it out,and neither could we. It did this off a tapped in 5th gear jump at a scrambles race.

    I bailed off the back and slid to a stop,it continued on with stuck throttle flipping end over end launching itself way up in the air like a big shiny hooked salmon. Ripped tires off rims,bent the frame a lot,the seat was bent in half in the middle,both handlebars were like road race bars laying on the tank,tank was destroyed.

    My girlfriends dad and I put it between a telephone pole and truck and used a come-along to straighten the frame out,then I traded it for a 56 Ford pickup with fat tires and nice mags.

    I bought a 77 KTMGP250 shortly after and never looked back,never bought a Honda again.

    Yours looks good with the red tank,better then the silver ones. I always ran the MT piston with the CR top end,lasted longer and had more low end grunt.
    #7
  8. Foot dragger

    Foot dragger singletracker

    Joined:
    Dec 27, 2006
    Oddometer:
    13,837
    Location:
    chico,just below rag dump(nor-cal)
    A stock 74 CR250 will do 5th gear wheelies all day long,not much rev but they have good snap at midrange.

    The MT is Very mild in comparison,like any japanese dual sport bike.
    #8
  9. Gizzaride

    Gizzaride Banned

    Joined:
    Aug 20, 2012
    Oddometer:
    191
    Location:
    Ozarks
    Maybe it's my age, maybe I've watched The Great Escape too many times, but the classic look of an old school scrambler just make me go weak at the knees!!!!!:cry
    Also, with all due respect to your GF's mode of transport, the Elsie looks 10 times better to me.......but I expect she looks 10 times better than you do!:rofl[

    [​IMG][/QUOTE]
    #9
  10. Dirtstar1

    Dirtstar1 Human torpedo

    Joined:
    Dec 9, 2010
    Oddometer:
    121
    Location:
    Almost mexico I.B.
    Footdragger that is a fantastic story. I can totally picture the hooked salmon! My friend had a pink baja bug we "called fish outta water" Hondas have always treated me right until I got the crf 450. Man did I get good at pulling the head off of it. My daily driver is a kTm690. It is a total "Do all machine"

    Ps, it didn't take long for the girlfriend to fall in love with the vintage look. Lol (Gizzaride) I bet my girl would take that as a complement. Thanks
    <a href="http://s29.photobucket.com/albums/c285/dirtstar1/?action=view&current=BBC37444-0EF8-4D74-A77D-496104168492-416-000000EB6CFADFC1.jpg" target="_blank"><img src="http://i29.photobucket.com/albums/c285/dirtstar1/BBC37444-0EF8-4D74-A77D-496104168492-416-000000EB6CFADFC1.jpg" border="0" alt="Photobucket Pictures, Images and Photos" /></a>
    #10
  11. Airhead Wrangler

    Airhead Wrangler Long timer

    Joined:
    Mar 4, 2008
    Oddometer:
    6,831
    Location:
    Back in Seattle, FINALLY
    Nice. :rofl
    #11
  12. larryboy

    larryboy Chopper Rider

    Joined:
    Jan 9, 2005
    Oddometer:
    17,290
    Location:
    Über Alles,California
    Was the Dynojet set for rwhp or corrected? They typically give you a corrected sheet to make you happier.

    14.04 HP with a Dynojet correction factor would give you the 17.55 number for crank hp.
    #12
  13. Dirtstar1

    Dirtstar1 Human torpedo

    Joined:
    Dec 9, 2010
    Oddometer:
    121
    Location:
    Almost mexico I.B.
    I asked for a baseline rear wheel hp. I'm aware of the laboratory correct imaginary horsepower. Lol
    #13
  14. snowhawk jockey

    snowhawk jockey Slack Jaw Gaper

    Joined:
    Jul 5, 2005
    Oddometer:
    1,178
    Location:
    The other Center of the Universe: Bend, Oregon
    I am "restoring" a barely running an MT250 barn find as a vint bike as well. Thanks for the dyno pulls, I feel better about what ain't happenin between the cases, now that I know it is only 17HP!! I look forward to the upgrades and their effect on the chart!
    #14
  15. Dirtstar1

    Dirtstar1 Human torpedo

    Joined:
    Dec 9, 2010
    Oddometer:
    121
    Location:
    Almost mexico I.B.
    My bike is really complete. Near all original, never been apart. It seems it doesn't like today's oxygenated fuels. Mine hits 78 mph but likes 60 as a cruise. As far as the 0-60 run its only slightly slower than the WR250 do to the weight difference. Might give you some seat dyno to gauge off of when you ride your bike.
    #15
  16. Dirtstar1

    Dirtstar1 Human torpedo

    Joined:
    Dec 9, 2010
    Oddometer:
    121
    Location:
    Almost mexico I.B.
    Took the Elsinore out at sunset with the girlfriend on the WR250x. The whole time I'm riding I couldn't wipe that silly grin off my face. If you think back to when that bike was new, imagine taking off the through the twisty canyons and going way too fast. The Elsinore is very capable in the corners! I was very shocked. Then imagine the pavement ending for the first time you had a machine that could soak up pot holes and ruts while power sliding around all the corners with ease. This must have felt like a major technilogical advancement! The trials tires are pretty sticky. They are glued down in the corners on the pavement and have a very secure grip on the dry slick DG roads around my place. I can't believe I never used them before on anything...
    <a href="http://s29.photobucket.com/albums/c285/dirtstar1/?action=view&current=342EA0E1-B96D-4D1F-87F7-5CEC254FD8BB-1348-000001A4D753ECB1.jpg" target="_blank"><img src="http://i29.photobucket.com/albums/c285/dirtstar1/342EA0E1-B96D-4D1F-87F7-5CEC254FD8BB-1348-000001A4D753ECB1.jpg" border="0" alt="Photobucket Pictures, Images and Photos" /></a>
    <a href="http://s29.photobucket.com/albums/c285/dirtstar1/?action=view&current=C155D8C3-4075-4233-8EAA-CE5D4972DD06-1348-000001A4DB8881DA.jpg" target="_blank"><img src="http://i29.photobucket.com/albums/c285/dirtstar1/C155D8C3-4075-4233-8EAA-CE5D4972DD06-1348-000001A4DB8881DA.jpg" border="0" alt="Photobucket Pictures, Images and Photos" /></a>
    #16
  17. Mr. Vintage

    Mr. Vintage Family Dude

    Joined:
    Jan 19, 2007
    Oddometer:
    902
    Location:
    The Palouse
    Awesome! Dang, you got me thinking about mine. It's a barn find, although I put it there so that probably doesn't count. :lol3 It needs everything, and is down the projects list a ways.... Fun bike, I miss having it working - it's good to see one being used.
    [​IMG]
    #17
  18. Dirtstar1

    Dirtstar1 Human torpedo

    Joined:
    Dec 9, 2010
    Oddometer:
    121
    Location:
    Almost mexico I.B.
    Your elsinore looks like its really complete! What's up with it? There are lots of parts on eBay right now for them.
    #18
  19. ctune80

    ctune80 Been here awhile

    Joined:
    Sep 1, 2010
    Oddometer:
    240
    Nice MT 250! Looks fun, where do you ride around San Diego these days. I used to ride at the old Palm avenue area when I was there and loved it!

    You ought to bring that MT up to Gorman this weekend for Yamaha Endurofest. They welcome all vintage riders to the event! It includes lots of riding on the trails of Hungry Valley and benchracing at the campsite at night!
    #19
  20. snowhawk jockey

    snowhawk jockey Slack Jaw Gaper

    Joined:
    Jul 5, 2005
    Oddometer:
    1,178
    Location:
    The other Center of the Universe: Bend, Oregon

    That is how mine looked when found, just stripped of lights and with dry rotted flattened sideways tires... The kid I bought it from, got it from his uncles barn and had spent weeks trying to figure out how to get spark from the twenty wires on the harness! Lucky it had been such a trouble for him to just get running, he never got to abuse it! That is where I came in and "saved it" from his unsavory paws... He wasn't even impressed when I pulled 4th gear down his back alley, with that rotted front tire flopping sideways around the rim! Kids these days :rolleyes
    #20