Joe Breaux

With the Yamaha gasket, I ll bet you wont have any more issues if yu run the fan 100%

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

not at all.. it gets around 15 mpg on premium fuel ... Masimo manual recomends premium, not really sure it needs it. . same mpg as before .. But at least now I can actually use it...

mine is fuel injected ..it starts easy, runs well..

theres definitely no belt so its probably like the old magneto systems.. someone said it puts out 20 amps ... hows yours coming

none that I can see.. charging normally ,no battery drain .Headlamps stil very bright.. but engine runs cooler by far

another weekend of no overheating.. I m telling you guys. BYPASS THAT FAN SWITCH!!! Run the fan 100% ...IT WORKS

Well, another weekend of fun in the sun.. right after Hurricane Laura theres lots of mud! and the damn thing did not run hot!!! WOO HOOO finally working properly and so far appears RELIABLY! And once more I would like to give a great big middle finger salute to the ahos at Massimo Motors Service Dept who refused to help me in any way...

hahaha "LEGENDAY MSU500 Engine:??/ ... hahaha thats hysterical..

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