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By Chile
2018 Massimo 700 MSU. The machine started burning oil all of a sudden. One day fine-- next morning burning oil. Looking for advice. Do I pull the engine to inspect the top end or can it be done with the engine in place? Pro? Cons?
Any and all assistance is greatly appreciated in advance.
Chile
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By Joe Rizo
Hello All,
We have exhausted all possible troubleshooting steps, now we are in need of some help.
Vehicle cranks but will not turn over. Things we have either replaced or tested and are now known good:
1. Fuel pump (new)
2. Fuel sensor (new)
3. Fuel injector (new)
4. Battery (new)
5. Spark plug (new), spark tested
6. fuses (12v to all)
7. we have 12v at the injector module and 11 ohms resistance
8. we have fuel in the fuel line to the injector
9. we have fuel at the spark plug
10. we have injector pulse, verified with noid tester
11. brake safety switch tested (couldn't find a separate switch assuming it is using the brake light switch)
12. seat belt buckled and seat in place (again, not sure if this model has these features)
13. replaced air filter
14. replaced several air hoses
15. flushed radiator and replaced with diluted antifreeze
16. Drained and cleaned the fuel tank prior to replacing the fuel pump.
Any ideas, we are open to....Help!!
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By Pick a name
The Axis 500 will not shift into low or reverse. I have high when it should be in low and all the other places it is reverse. The gears in the shift cover are fine and I shifted it when the cover was off and yet no change (so it can't be the shifting mechanism gears). I t has been difficult to get it into low for awhile. But now it is either high or reverse, no neutral either.
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By Rschrem
Hi, my 2010 Hisun will crannk but comes to a stop and only clicks. It has new battery and solinoid. Battery connections all seem good. Any ideas what the problem is?
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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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