Page 1 of 2 1 2 LastLast
Results 1 to 15 of 26

Thread: F 750 GS Engine nature

  1. #1

    F 750 GS Engine nature

    Good day,
    I just purchased a 2021 F 750 GS low mileage bike from a gentleman in NH. The motor's feel is that of a 1 cylinder (a thumper). I did a lot of research before this purchase and no one mentioned this attribute. Please let me know your impression of this motor.

    Thanks, Scott

  2. #2
    Registered User JIGGIN's Avatar
    Join Date
    Oct 2007
    Location
    Lake Elmo, MN
    Posts
    118
    40+ yrs since owning a thumper soo, I just went from a boxer (RT) to a very mildly used '21 750 (age, weight, no longer trips, etc) . A whole different animal, but I'm really getting to like it with a few changes ( windscreen,sengine guards,seat,bar risers, etc) BUT I do find this motor is loud. Hear it over the exhaust. I just turn up the tunes in my helmet lol.
    2014 R1200RT

  3. #3
    check the settings for rain, road or off-road settings on the TFT. I know when my daughter 2019 750 Gs was in the rain setting it felt way under power. Changed the setting to road mode the pep came back.
    MJ

  4. #4
    Loncin engines in general are considered to be good value for the money, but even when exact copies of others designs they tend to be a little rougher or noisier than the original they were copied from.
    I wouldn’t be too worried about it. Many manufacturers are using Loncin engines these days and they seem to hold up just fine.
    -Live as fully as you can as long as you can-

  5. #5
    Registered User crna59's Avatar
    Join Date
    Apr 2017
    Location
    Snohomish, WA
    Posts
    163
    When BMW switched from a 700/800 to 750/850, they also changed the firing order to give the engine a more "V-Twin" feel. I had a 700 years ago and the 750 I had definitely was not as smooth.
    Bruce A. Brown #212072
    MSF 2-wheel Instructor
    H-D Riding Academy Instructor
    S/TEP 3-wheel Instructor

  6. #6
    rmcfadd2
    Join Date
    Aug 2021
    Location
    Tempe, Arizona, USA
    Posts
    5

    F-750 engine mods

    Is there any way to get a little more horsepower/torque from the 750? If it is the same engine setup as the 850, can it be re-mapped? A different fuel manager perhaps; different exhaust, etc?

  7. #7
    Registered User crna59's Avatar
    Join Date
    Apr 2017
    Location
    Snohomish, WA
    Posts
    163
    Quote Originally Posted by rmcfadd2 View Post
    Is there any way to get a little more horsepower/torque from the 750? If it is the same engine setup as the 850, can it be re-mapped? A different fuel manager perhaps; different exhaust, etc?
    Yes, but you'll need to add a Power Commander. You can't "reflash" the ECU like most sport bikes. I had a tuner put one on mine and got a modest gain. I was looking mainly for smooth throttle control down low because I used it in my motorcycle classes for slow speed maneuvers.
    Bruce A. Brown #212072
    MSF 2-wheel Instructor
    H-D Riding Academy Instructor
    S/TEP 3-wheel Instructor

  8. #8
    Cum opus clava fecit nihi
    Join Date
    Mar 2003
    Location
    Okanagan Valley, BC
    Posts
    720
    There is a thread on remapping over here:

    https://www.advrider.com/f/threads/g...s-850.1529632/

  9. #9
    Registered User drneo66's Avatar
    Join Date
    Jun 2009
    Location
    Rochester, MN
    Posts
    1,202
    Quote Originally Posted by OldCamper View Post
    Loncin engines in general are considered to be good value for the money, but even when exact copies of others designs they tend to be a little rougher or noisier than the original they were copied from.
    I wouldn’t be too worried about it. Many manufacturers are using Loncin engines these days and they seem to hold up just fine.
    Except in this case I'd assume that BMW designed the engine/parts and Loncin is just putting it together...
    Current: 2007 BMW R1200RT, 2013 F800GS
    Former: 1995 BMW K75S, 2009 BMW G650GS
    MOA Member #:150400, IBA#: 37558

  10. #10
    rmcfadd2
    Join Date
    Aug 2021
    Location
    Tempe, Arizona, USA
    Posts
    5

    followup to re-mapping

    to re-mapping
    Quote Originally Posted by crna59 View Post
    Yes, but you'll need to add a Power Commander. You can't "reflash" the ECU like most sport bikes. I had a tuner put one on mine and got a modest gain. I was looking mainly for smooth throttle control down low because I used it in my motorcycle classes for slow speed maneuvers.
    Exactly the problem I had during slow speed maneuvering training with "Ride Like A Pro", here in Arizona. Took the mode out of dynamic, and into enduro, and it helped. But more low-end torque would be nice. I wonder if putting a power commander on would void warranty, or cause other issues?

    Dealer service manager told me to buy an 850, but 750 fits me better. I do miss my africa twin horsepower/torque, but bike was too tall.

  11. #11
    Quote Originally Posted by drneo66 View Post
    Except in this case I'd assume that BMW designed the engine/parts and Loncin is just putting it together...
    Which I suppose is exactly what BMW would want buyers to assume.
    In fact many BMW motorcycle drivelines have had significant design influence from outside engineering sources over the years. Peugeot, Rotax, Ricardo, Getrag, Bosch and Kymco come to mind. It’s probably not in BMW’s best marketing interest for potential buyers to think their “premium” priced products have significant non-German content. But, it’s a global economy and good designs do come from other parts of the world.
    -Live as fully as you can as long as you can-

  12. #12
    Registered User crna59's Avatar
    Join Date
    Apr 2017
    Location
    Snohomish, WA
    Posts
    163
    Quote Originally Posted by OldCamper View Post
    Which I suppose is exactly what BMW would want buyers to assume.
    In fact many BMW motorcycle drivelines have had significant design influence from outside engineering sources over the years. It’s probably not in BMW’s best marketing interest for potential buyers to think their “premium” priced products have significant non-German content. But, it’s a global economy and good designs do come from other parts of the world.
    Don't forget the "G 310" bikes made in India!
    Bruce A. Brown #212072
    MSF 2-wheel Instructor
    H-D Riding Academy Instructor
    S/TEP 3-wheel Instructor

  13. #13
    Registered User
    Join Date
    Jul 2003
    Location
    Southern Indiana (near Louisville, KY)
    Posts
    34

    Re: Loncin

    Quote Originally Posted by drneo66 View Post
    Except in this case I'd assume that BMW designed the engine/parts and Loncin is just putting it together...



    Then F bike engines were developed by Rotax with some modifications specified by BMW. The early single 650s had 4 valve heads where same engine used in BRP (parent co. of Rotax) used 3 valve heads in their powersports products. When the twins came out the 650 single was rebadged a "g" model and assembly of the single engine moved to China but apparently with Rotax components. Up through the 700 and 800 twin models it was a Rotax but again when they became 750 and 850 assembly moved to Loncin in China. There were significant changes to the engine (from right side chain drive to left, different crankshaft configuration and others) Not sure if it is still a Rotax design or not. Maybe someone else knows.

  14. #14
    The original “Rotax 655” 650 single was an Aprilia/Rotax 5 valve design used in the Aprilia Pegaso cube.
    The “Rotax 654” design variant built for BMW by Rotax and then later Loncin had a 4 valve head. That engine design lives on in the world market Loncin/VOGE “650DSX” and in an earlier Loncin model that was likely restricted to China sales only to avoid directly competing with BMW.

    The “Rotax 804” design was used in BMW 650, 700, and 800 twins. They were all 800’s and varied in tuning and final gearing. I believe they were all built by Rotax.

    There is nothing to indicate Rotax assisted in the design of the Loncin twins currently being built for BMW.

    I suspect BMW realized significant cost savings by sourcing engines from Loncin rather than Rotax. Some Rotax engines are certified for aircraft, after all. Still, the Loncin twins do seem to be holding up well. The Chinese ARE building some decent motorcycles these days. We will probably see the Loncin VOGE brand here in the US soon and that may be a game changer for certain BMW models.
    Last edited by OldCamper; 08-16-2022 at 05:37 PM.
    -Live as fully as you can as long as you can-

  15. #15
    Cum opus clava fecit nihi
    Join Date
    Mar 2003
    Location
    Okanagan Valley, BC
    Posts
    720
    Quote Originally Posted by OldCamper View Post
    The “Rotax 804” design was used in BMW 650, 700, and 800 twins. They were all 800’s and varied in tuning and final gearing. I believe they were all built by Rotax.

    There is nothing to indicate Rotax assisted in the design of the Loncin twins currently being built for BMW.
    Correct on both counts. Removing a side cover on the 800s reveals a "Made in Austria" stamp in the casting.

Similar Threads

  1. 1972 750 engine question
    By kantuckid in forum Airheads
    Replies: 7
    Last Post: 05-19-2009, 01:03 AM
  2. Despite my fastidious nature . . .
    By flgoff in forum Campfire
    Replies: 5
    Last Post: 01-20-2008, 02:01 AM
  3. Trashing Out Mother Nature Needs Analysis
    By redclfco in forum Campfire
    Replies: 17
    Last Post: 04-20-2007, 05:38 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •