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· Registered
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Discussion Starter · #1 ·
Happy I found this place... I have a 2010 Yamaha Majesty 125 where I've just replaced the cylinder and piston. I've reconnected everything exactly like it was before I disconnected everything... but there's this one green and red wire that doesn't seem to go anywhere... and the starter button (which worked just fine before I changed the cylinder) doesn't seem to be doing anything at all.

Automotive tire Motor vehicle Automotive exterior Automotive wheel system Gas

...which is odd given that I didn't even need to TOUCH the starter in any way to completely swap out the cylinder and piston. Could the tensioner tension be preventing the starter from doing anything?

Also there's this mystery bolt with a connector on it... does anyone have any idea what this does?

Helmet Gas Personal protective equipment Wood Metal

This is what it all looked like when I first got started:

Automotive tire Hood Automotive lighting Tire Motor vehicle

...and this is what it looks like right now:

Motor vehicle Automotive tire Auto part Metal Scrap

Any help would be appreciated or, at the very least, maybe these photos could help the next guy.

Thanks in advance!

· Registered
28 Posts

The "mystery bolt" is the coolant temperature sensor. I don't have a wiring diagram for the 125 but if the unaccounted for wire is anywhere near the sensor it's a good bet that's where it goes. Most likely it's either for a coolant gauge or feeds into the ECM (if the 125 has one).

Unfortunately I doubt it's related to your no crank issue.

If you're referring to the timing chain tension being to tight it's highly unlikely that would cause a cranking issue. Check all your connections, how's the battery, what do the lights do when you press the starter button?
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