Massimo Buck 400 Top speed

[Richard Schleper]

 I have a new Buck 400 with about 60 miles on it. It runs great but can only get it up to 23mph. Is this normal? If not what speed are others gettting.

[WhiteLightning]

Heck, my T-boss 410 will do 37 flatout.  Speed limits around the ranch are only 25.

[Richard Schleper]

 I can not figure this out. I can get the same speed in high or low range. Rpm in high is 4500 in low range it is 7000. same speed. I use it on my small farm but some time I will go to the river to fish or visit friends several miles away. I am not a kid trying to tear things up I am a 70 yo disabled Vietnam Vet. I would just be happy at 30mph. I sent e-mail to factory but never got a response. My local service dealer is closed over this viris scare. Any help would be welcome.

[WhiteLightning]

Richard

You might try changing the oil. They have a wet clutch and require API SG oil.  Mine did way better when I changed mine.  I used Castrol Motorcycle oil as it was the only one I could find out here with the SG. I'm 70 years old as well.

[Richard Schleper]

I did change oil, no change. It is hitting the rev limit when in gets to 23, no slipping of clutch it will pull a hill with no problem just will not go any faster than 23.

Took it out today put a few more miles on it when I got to 75 miles it did better, now I can get 24mph before the rev limit .

Edited August 8, 2020 by Richard Schleper

[Joe Breaux]

23 mph seems low.  My MSU 500 does 38 mph ... on the days that it actually runs .. Oh btw, dont bother calling Massimo... they rarely answer, never call back if you leave message, and if they do, they know nothing and wont help you in any way 

[kenfain]

I'm sure there's a limiter. I've had my mule on a robust downhill plunge. Got er up to a whopping 40 mph. Got a little scary, because this thing drives like a tractor. It's probably limited for a good reason. 

[KenL]

Hey............I too have about 50 miles or so but have had the Buck for about 10 months.....just did my first oil change today.  I get 27 to 30 mph in low and 40 mph or so in high.  I've only tried high a couple of times (bc of breakin period) so I suspect it will go faster.

[Joe Breaux]

since the repairs, mine has gained slightly.. It hit 42 mph last weekend with just me in it 

[Richard Schleper]

Mine is still stuck at 24 mph. I did read how to get trouble codes. Got two codes 13 and 51. I just need to find out what those codes stand for. If anyone knows please get back to me

 

[Tom Hoppes]

Richard, I'm betting you have the wrong ecu in your machine.  Call Massimo and  they will send you the right one.  Where the law limits slow moving vehicles to 25 mph is where the ecu you have is used.

[Richard Schleper]

Tom

 I am with you 100% . It runs great just not past 24mph. I have sent several e-mails, No response. I will try calling today.

[Joe Breaux]

Massimo does not answer emails or phone calls. and never return phone messages.. They got your monery, they could not care less what problems you have.. They arethe worst company I have ever seen. Try ordering the part online from others 

[KenL]

Update after oil change (crazy that there is no oil filter).  Yesterday in low with my wife (I'm 235 lb and she's 130 lb) - 27 mph at 8000 rpm (started to hesitate consistently at this speed and rpm); 45 mph in high around 5500 - 6000 rpm.

[Joe Breaux]

8000 rpm????  holy crap!!!!  

[KenL]

Yup, according to the Tach.  Red line is 10,000.

[Richard Schleper]

I was able to get in touch with someone in the warranty dept. They sent me a new ECU, i installed it yesterday. Now it runs great,over 40mph no problem.

[Joe Breaux]

That guy will probably be fired for sending that to you free ...

[Mackc]

On 8/14/2020 at 9:19 AM, Joe Breaux said:

23 mph seems low.  My MSU 500 does 38 mph ... on the days that it actually runs .. Oh btw, dont bother calling Massimo... they rarely answer, never call back if you leave message, and if they do, they know nothing and wont help you in any way 

I got my Buck 400 up to seventy -five MPH yesterday, I slowed down to 55 MPH because  I was afraid the top was gonna come off and I was on a Farm to Market road.

 

🎌

 

Yeah It was on a trailer behind my old Chevy pickup!

[Joe Breaux]

haha  I was saying  BEHIND YOUR TRUCK as I WAS READING IT!!                                  I am still bewildered by the 10,000 rpm... Mine peaks at 5500 

[KenL]

Must be Canadian rpms versus US - You guys south of the border are a  bit more laid back - probably affects the engine of your UTVs

 

[Joe Breaux]

must be.. by the way, that top will tear off .. I built a front mount bracket for mine, atteched to roll cage..  I tow at 70 mph with no problems now 

[Travis]

22 hours ago, Mackc said:

I got my Buck 400 up to seventy -five MPH yesterday, I slowed down to 55 MPH because  I was afraid the top was gonna come off and I was on a Farm to Market road.

 

🎌

 

Yeah It was on a trailer behind my old Chevy pickup!

Comment of the year!!!