Joe Breaux

doubtful

My mechanic recomends 50/50 Prestone .. Hes the only authorized Massimo tech within 200 miles of me ...

maybe if you live in Alaska.....lol otherwise no

I hope I was helpful to you guys.. I wish someone would have clued me in , in the beginning.. could have saved me a lot of cussing... Massimo Service Dept was a complete joke, zero help from that useless bunch.. BUT, If these things run right , they are loads of fun once you get the factory flaws worked out! ..

not using a thermostat

Hope it doesnt airlock again.. if it does, its a head gasket leak.. only replacing it will fix that .. But keeping those engine temps down prevents future blown gaskets

Yep.. thats it.. tape it good to keep water out in rain and such.. hit the trails and enjoy...... if your head gasket isnt already leaking.. you will know within a few miles ....

It could not be easier.. Unplug the black plug -in from switch on the radiator . put a short jumper wire from one side of plug to other.. the switch just interupts that wire. Tape it up .. It will only run if key is on..

bypassing that switch does a lot of good, ...brings down excessive temps, saves your engine and costs ABSOLUTELY nothing.. thats seems like a good thing to me .. Good Luck on yours .. If you can get these to run more than a few miles, they are a lot of fun.. Mine does well in mudholes. My Neighbor has a Kawasaki Mule.. I went thru a deep mudfilled wash out, he followed and he got stuck .. I PULLED HIM OUT! .. He was not happy.. lol

there is another vent on the top of the head , you may have to do it several times.. but if you have air, your head gasket is toast, and water will stop circulating in a few miles again ... have you checked for water in your oil?

It may be normal for quality built engines from HONDA or Yamaha but it cooks cheap chinese heads and gaskets.. I told you of my experiences with Massimo. I told you what an experienced Massimo mechanic recomends.. I can do do more ... But I can tell you if you let it run 220* plus, [ because it will go to 230-240* with factory settings on hot days ]you will be pulling heads regularly.. Mine fried the first HEAD AND HEAD GASKET at 250 miles .. You paid for it, so you can choose to do what you want.. I was just giving you benefit of my experiences and several others on here as well where I live and the dozens of Massimos that my mechanic has repaired ... besides if those temps were safe for HISUN engines, WHY DID MASSIMO DISCONTINUE USE of them completely and tell me on phone how they are plagued with overheating....anyway ?? Good Luck.. If you want to attempt Head Gasket repair yourself, there is a video on YOUTUBE of how to . Be aware it is a chain drive overhead cam with flyweight timing advance mechanism on cam assembly .. You can do it in the frame

My mechanic says he has done dozens and the fans run for years at 100%.. He says because Masimo didnt build them..lol

The reason your radiator is not hot is because you have steam/ air blocking the system and water is NOT CIRCULATING.. So theres no hot water to cool.. radiator isnt hot, But your engine is boiling .. If you bleed the air out of all vent screws, the water will move again if your pump is good but the air leaking into system from blown head gasket will block it again in just a couple miles . I just went thru all that and so have a lot of us.

Dont know.. My Mechanic did not know of any either.. he showed me how hot these run and recommended full fan operation. Hes the only repair shop within 200 miles of me that will even work on Massimo machines so ..... IT WORKED! Thats my only concern.. you can try to find something online maybe but I doubt theres any device for Massimos ... I know if you let it run at factory set temps , you will never keep head gaskets ... Massimo admitted as much to me on phone. Mine even cracked the head and had to be replaced.. If your concern is environmental pollution from yours, maybe UTVs are not for you? They are off-road vehicles, emission stanards are much different than your daily driver .. Spark suppression is a much bigger concern in the woods that can burn

The engines are factory set on fan switch to run really hot.. the engines are not capable of withstanding those high temps . Thats my experience anyway.. I have brought mine down 40 -50 degrees or so and it seems to be much better.. 220 degrees is just too hot in my climate. Maybe in canada its OK.. MAYBE.. The fan is capable of keeping it cool if you bypass that switch and run 100%. .mine now stays cool and I dont seem to have any more problem. Plus I dont have the massive heat coming up behind my seat now.

I think its pretty common in all Massimo machines.. the cooling systems are poorly designed . The HISUN had other issues as well as overheating, thats what prompted Massimo to discontinue them and use Linhai engines .. Dont seem any better

If you keep getting air in the cooling system, its probably not just the pump, your head gasket and maybe your head is blown.. Massimo is famous for overheating

check the exhaust pipe right out of the head.. Prone to cracking and breaking off . ANOTHER factory defect from Massimo Poor Quality .. I implore you to bypass the fan switch and run it 100% when key is on .. MSUs have massive overheating issues that blow head gaskets and warp or crack heads.. And Massimo WILL NOT WARRANTY IT

Well, I was talking about using an automotive type pump, from a Prius, so hot water would not be an issue.. But since the new head, head gasket and waterpump replacement and bypassing the fan control to allow 100% fan operation, the engine runs much cooler. probably 40 degrees cooler now.. I dont think I need additional radiator capacity or electric pump now.. I have run it pretty hard for 3 weekends now and it performed flawlessly in extrmely hot weather .. I am glad the guy did not take me up on $4900 selling price.. I would not take that now.. I Bought it in March 2018 , from TS. It only had 300 miles at that time I was willing to sell it,, but it now has 450 miles and runs perfectly thanks to my great mechanic.. With ZERO help from Massimo Ripoff Motors

bought it in March of 2018 from tractor Supply... well , after another long trip in the woods yesterday, in 96 degree heat, the damn thing performed flawlessly.. that dude should have jumped on it when I offered to sell for $4900.. It is running great finally.. thanks to my excellent mechanic.. and no thanks to the pathetic service dept a Massimo RIPOFF Motors

well. after 6 trips to shop..replacing the cfracked head, bad gaskets, waterpump and bypassing fan to run 100% .. NOW it doesnt run hot anymore.. HOORAY and that awful heat coming up behind my seat is gone too.. Also removed windshield.. that keeps ME from running hot too .. Guess I wont be needing an electric pump after all.....

Good Luck... btw, took mine out yesterday again to the trails at the River... ran absolutely perfectly .. never got hot at all with fan running 100% now.. and I dont have all that hot engine air coming up behind the seats now.. And it was brutally hot outside. in the swamp .... 96* with a 110* heat index.. ran at least 25 miles... My mechanic did a good job.. hopefully this will end my problems from a couple years ... NO THANKS TO THE "EXCELLANT" SERVICE DEPT AT MASSIMO RIPOFF MOTORS .... ps I removed the winshield completely ,,, MUCH BETTER FOR DRIVER

defective chinese gasket .. ask if they can use Yamaha .. shop warranteed it tho.. no cost .. Its running really well now.. but who knows how long

thats exactly what I had.. I suggest you replace the waterpump and bypass the temp switch for fan to run 100% or you will be back there again

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