GEBE Komatsu Zenoah Redmax GZ25N direct replacement

Discussion in 'Rack Mounted Engines' started by cpuaid, Nov 6, 2009.

  1. cpuaid

    cpuaid Member

    Does anyone know what engines can be used as a direct replacement for an older GEBE Komatsu Zenoah Redmax GZ25N kit? I love this engine to death due to it's horsepower to mileage ratio (220 miles+ per gallon!!) but it's impossible to find a spare engine for it online. Calling around the local Redmax dealer wasn't any help at all.
     

  2. augidog

    augidog Banned

    i don't know for sure, but i'll guess your old 25cc kit uses a 54mm dia. clutch...measure to be sure...that should be all you need know when considering a replacement...

    there's a few "in stock" engines here that should do the trick :)

    http://www.adaracing.com/parts/scooter/engines
     
  3. cpuaid

    cpuaid Member

    Calls to a couple of local small engine/lawnmower repair shops wasn't any help either. I can get no one to confirm that it's a 54mm clutch. Apparently these engines rarely break down!
     
  4. I'm fairly certain it's a 54mm clutch. Call GEBE, they were a major dealer for these engines and will be able to suggest a suitable replacement.
     
  5. augidog

    augidog Banned

    den's always said how much he loved them, i've never had the pleasure.

    you're the best guy to confirm what you have now...i don't have a 54mm to
    reference, so i'll try to bass-ackwards help out.

    here's a 76mm gebe clutch...
    Mvc-016f.jpg
    the distance between the bolts that attach to the engine is approx 72mm...so a 54mm clutch would have a (my quick guess) 46-50mm bolt-distance. since there's only the 2 sizes, the difference should be obvious.
     
    Last edited: Nov 6, 2009
  6. seanhan

    seanhan Member

    You might check e-bay or craigslist for a redmax never know ???
    I did a quick check on ebay they had a few parts for redmax..
    it also said redmax was maid by KOMATSU..
     
  7. cpuaid

    cpuaid Member

    I've checked Ebay and even nation wide craigslist daily for the past several months on that particular part number or compatible Zenoah/Komatsu/Redmax newer model engine. Most of the Zenoah/Komatsu/Redmax engines on Ebay is for a different model number and is mainly used in R/C cars, airplanes, or marine applications which I'm not sure if they use the same clutch assembly. Gopedders also sometimes use the Zenoah/Komatsu/Redmax engines but many have switched over to the Chinese CY engines. I've googled the heck out of that model on lawn and small engine websites but again no luck. You may think i'm crazy but this engine fits perfectly for my needs @ 220+ MPG and a cruising speed of at least 30 MPH and a top speed of 33 MPH.... and all of this on a 25CC engine! Nothing else out there even comes close to the mileage and power ratio of this wonderful little Japanese engine.
     
  8. TREEWK

    TREEWK Member

    I Have A Couple 49cc Tecumseth With The Small 54 Mm Clutch, Do They Bolt Up?? Ron
     
  9. cpuaid

    cpuaid Member

    Treewk, I also have a Tecumseh TC200 21220 B 6092G that came with a Viper TC3 friction kit I bought several months ago. I never even took a look at the clutch size but from the mounting bolt spacing, it also appears to be a 54MM clutch!
    motorbikemike45 & augidog, there is a metal shroud that is covering up the clutch drum assembly and is roughly about 65MM. I will not be able to remove it until Sunday (if I dare). Honestly, the whole unit has been running well and i'm just a little afraid of messing around with the current setup. You know the old saying... why mess with it when it ain't broken. you would think another member would know the clutch type/size of the GZ25N since it's been around for awhile!! I guess these engines really never break down for anyone to even want to open it up and see. my wife has told me to get rid of some of my other motorize bikes so i plan on keeping my Staton with the Mitsubishi TLE43 and this GEBE with the GZ25N. With the extra cash i plan on buying a spare GZ25N engine just in case i ever go on that cross state bike ride i've always wanted to do.
     
  10. TREEWK

    TREEWK Member

    Centralprossesorunitaid, Yes One Of My Tecumseth`s Is A Complete Friction Drive New In The Box, Never Ran. I Thought Mine Were T 300 Models. I Need To Look At Them Again. I Have Around 40, All Styles. (bad Out Of Control Addiction) Ron
     
  11. TREEWK

    TREEWK Member

    Cpuaid, My First Purchase After Finding Out About Mab And Joing Forums Was The Tle 43cc Mitsi. From Viza Motors In Az. $206.. Took 3 Months To Get It. Pd With Paypal, But They Couldn`t Help Me Because The Sale Was Out Of Ebay. By The Time It Got Here, I Had Read So Much Good Things About The Engine That Am Saving It For Some Special Build. Think They Are Hard To Get Now Days. Ron
     
  12. cpuaid

    cpuaid Member

    I finally located a Workshop Manual for the GZ25N and it does indeed have the 54MM clutch. apparantly the shroud is the shaft housing adapter used by the following items which GEBE retained. No wonder it threw me off as to what type of clutch assembly the GZ25N uses. I was used to just bolting a small engine with exposed clutch housing to a rack. Looks like my choices will be very limited in finding a direct replacement engine for this old GEBE.

    • Brushcutters BCZ2500S/BCZ2500SU
    • Long Reach Trimmer LRTZ2500
    • Short Reach Trimmer SRTZ2500
    • Pole Saw PSZ2500
    • Sweeper RMSZ2500
    • Hand Held Edger HEZ2500S
    • Split Boom Trimmer : EXZ2500S
     
    Last edited: Nov 7, 2009
  13. cpuaid

    cpuaid Member

    Here is a blow up diagram of the engine. Any ideas, anyone?
     

    Attached Files:

  14. augidog

    augidog Banned

    i just got off the phone with juls, gabbing about something else, but i asked about your question...it seems your engine uses a proprietary housing (you already knew that but i didn't)...she mentioned that direct-replacement engines (tho mostly zoomie-zoom cheapos that aren't long-lived) with a shaft output will be found in the RC/Car venue. hope this helps, i'll be interested in seeing what turns up.

    ps-she also said, and i concur, that den would suggest the tanaka 32 & new vented clutch if the redmax ever finally bites it...i do know he loves them (from a seller/reliability/quality standpoint) as much as he loved the zenoahs.

    i just dug up this "discontinued" page from golden eagle...no wonder you like the danged thing so much: http://www.bikeengines.com/redmax25info.htm

    EDIT: just in case http://www.redmax.com/node3936.aspx?nid=158999
     
    Last edited: Nov 7, 2009
  15. TREEWK

    TREEWK Member

    I Have Several Wacker Motors I Bought Off Ebay Etc. Imho I Think The Older Wacker Motors With 2 Crank Bearings And Starter Located Opposite The Power Out Put Side Are The Best Of Course. They Keep Cutting Production Costs, And Not Nearly The Engines They Were. I Gave Up On The Little Engines For Now, Maybe Later. Just My 2 Cents! Ron
     
    Last edited: Nov 7, 2009
  16. cpuaid

    cpuaid Member

    Thanks for the info, augidog. That's why alot of the gopedders uses the Chinese CY engines (which I will refuse to use). Now that I know the old GEBE uses the proprietary adapter, I can narrow my search by looking for used Redmax commercial trimmers, pole saws, and edgers. I also was contemplating on going to the Tanaka, but with the price of one of those engines and an adapter upgrade, I may as well just buy a new GEBE kit. And so the search continues...
     
  17. You could consider the Tanaka or Mitsu. Power and quality of build are very similar to what you have now. Another option would be a Robin 25 or Honda 25 4 stroke, but you might be disapointed at the lower power, and I understand the smallest Hondas (25-35) are now made in Thailand instead of Japan and the quality/life span are poorer. The Robin, Tanaka, and Mitsubishi are well made little engines that would likely last as long as your RedMax has. I have the Robin 35 and love it, but it uses a 74mm clutch.
     
  18. seanhan

    seanhan Member

  19. cpuaid

    cpuaid Member

    yeah i've seen them online. Redmax policy prevents their authorized dealers from posting prices online. I was finally able to locate a model of the trimmer that uses the GZ25N engine but apparently their has been a slight design change that some has said which affects the performance/reliability when compared with the older GZ25N's. Husqvarna acquired Komatsu Ltd.'s outdoor power products operation in 2006 and that's when GZ25N had a design change. My best bet is to locate an old trimmer with a pre-2005 manufactured engine date.
     
  20. cycledude

    cycledude Member

    220 mpg? Surely you jest Sir. 2 or 4 stroke? I dunno about....well most of the stuff.
    I wish there was a sticky or something with definitions for the GEBE, HAPPY and all those other names, they are driving me crazy I tell ya.
     
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