Rear diff and swing arm
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By Chile
2018 Massimo MSU 700 EFI. I realize that this engine is essential the same as in all of the HISUN based Yamaha clones out there. I am in the process of performing a top end diagnosis/rebuild. I have an AMAZON top end rebuild kit on order in anticipation of this activity.
Question 1: When exploring the myriad of top end rebuild kits on the market for these units there are some cylinder assemblies that have "686 cm3" badging next to the cam cain tensioner boss. Others compatible with the unit do not have this badging. The existing cylinder assy does not have the 686 badging. I am assuming that this simply verifies that the cylinder assy is for a 686 cm3 engine which of course the stock 700 series HISUN engines are. Am I missing something here or is this just a manufacturer artifact? With or without the badging the application listings all indicate compatibility with the MSU 700 series engines.
Question 2: I have reviewed at minimum a dozen videos associated with this rebuild. To date I have not found one that deals with piston/cylinder clearance and/or ring gap verification. The advertised specifications for these various "top end rebuild kits" all indicate: Cylnider bore = 102mm and piston diameter=101.5mm. The math yields a .5mm (as in 1/2 mm) difference. That seems to be a very large piston/cylinder clearance. I realize I am referencing advertised specs rather than emperically measured values but the numbers have gotten my attention. I have referenced the FSM and found it to be somewhat confusing in this regard. Hopefully the experts on this forum can enlighten me as to where my observations are faulty here.
Any and all assistance is greatly appreciated .
Thank you all in advance,
Chile
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By Edelbrock
So I'm interested in a side by side of some sort.
Not sure what make/model to even look at.
I would plan on riding on trails with very rough rocky terrain and plenty of mud. Maybe sand once in a long while. I like LOTS of power and drive fast, but also like a trail that is a challenge to get through. I think 4x4 would be a must. I like the idea of a supercharged engine, but I have never owned one, and would be a little concerned about long term reliability or expensive difficult engine repairs. If anyone knows quads, my favorite was the 2008 Polaris Outlaw 525 IRS. For dirt bikes, I raced a 2008 KTM 450 SX-F. So that gives you an idea of what type of off road stuff I liked.
I don't like "utility quads" or "trail bikes". And likewise, I dont want a turd UTV. I want something that looks awesome and performs awesome. 2 seater with some cargo capacity at the minimum.
Thoughts?
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By FTG-05
I want to ditch my Kubota RTV-XG850 and its moronic twitchy throttle design flaw, get rid of the problematic engine and the 40 mph purposely throttled speed.
So far, I'm looking at the Honda Pioneer 1000 and the Polaris Ranger 1000, both of which have 1000-1500 lb payload bed capacity.
What other makes and models should I be looking at?
Thanks for the help!
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By mcraigchr
Howdy y'all,
I have the service manual, but it leaves me with questions.
1) It is time to change the diff fluid. The service manual says 80w-90 for the rear and Dextron 3 ATF for the front! Is that correct? That seems odd to me.
2) The service manual also speaks of the need to change the transmission fluid but gives no detail about it. What needs to happen here?
3). The service manual also discusses changing the final drive fluid with 80-90 Hypoid. Is the final drive actually the tranny?
Any details about the changing of the fluid or what fluid to use ... or even other things that need to be changed that the manual does not mention would be appreciated.
Thanks,
Craig C.
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By Tejun
Neighbor rode their Coleman with the park brake apparently not fully released. Needless to say, things got pretty hot and even started smoking and the smoke was definitely gear oil smell. Looks like oil is coming from the area just behind the disc for the park break. Looking at parts diagram, there is an oring behind the nut/washer that attaches the flange to pinion shaft. I'm not finding anything on YT that would help with disassembly. Anyone have some experience with removing rear driveshaft ?
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