raceway ever have any troubles with the little kmx 50 mine is fairly new it wont start it began with just not starting once in awhile now it wont start at all (even tried a little shot of starting fluid in the air cleaner nothing )got spark and fuel compression out of the pipe would the valves be out ? how do you check or adjust them?or could it be timing how do you check the timing chain

heres a tip for the yamoto 70 make sure that the boot over the shaft nuckle is not binding in its right behind a peice of plastic over the shaft the black tubing is coming out from behind it if the clamps slide in the rubber boot drags in the shaft and makes it harder to turn i also changed that black tube for one that was larger seemed to fit on better dont know if it helped or not there is a place for oil behind that cover apears to be gear oil ????

yamoto 70 mods
removed air intake restrictor
changed rear end oil to atv specific oil (kawi sells it)
removed two of the three black spacers between carb and intake
atv kawi oil in engine
with a 95lb rider still a little doggie on take off but top end is 29mph (clocked with my 700 polaris sportsman dig speedometer)
speed increased at least 5-6 mph just by riding and it breaking in the oil and shaft boot were done later
far from the 38 mph the manufactuer claimed but you can turn almost complete lock at full throttle and not get a tire off the ground and that i like alot my kids have never rolled or came close to rolling this over unlike my old kmx 110 that thing almost tips over idiling

 

Yes, The carb. get a new one or take it a part and clean it out. Check that the pin is working properly. Also when you take the bottom bowl of the carb off there is a gold color rood like screw. There is a air hole in the center of it. Unscrew it and see if you can blow through it. It should be clear to get air through it. I have found that times this gets clogged and will screw things up. If you do try this or don't want to, just get a new carb. If you would like to call me I would be happy to go over these things with you!

 

Thanks guys these are some great tips! I will have to try these over time. It will be a while before my son will want to go faster.









2001 Honda Rancher
2005 Yamoto 70

 

I dont think its the carb it should fire on the starting fluid dont even get a that
the carb is clean the pilot and the needle the float is working ???? unless i am getting air in but it should still fire the starting fluid ?

 

If you would like to call me I will try to go over some things with you.

 

do you know what the timing is on these it has to be timing or a hole in the piston
how do you check timing on a quad like these

could it be a stuck valve?

not looking forward to taking a 600$ quad in to ashop after one month of riding if they will even work on it for me is the next thing
thanks raceway i will try to call

 

What I have noticed to help was to spray belt dressing onto the CVT Transmission belt. This really helps it to "bite" onto the clutch assembly. I was driving for hours on a dusty trail when it would not go up hill with the belt eventually smoking in the trans. The belt was slipping, but not loose. The best dressing spray brought it right back to where it should be, if not better. In fact, as you gas the Yamoto, it no longer feels like a gradual take-off, you can really feel that the belt is in constant positive contact with the clutch/pulley assembly when it's gassed. So as soon as that clutch engages, it takes right off.

Putting on the K&N Filter this weekend. The K&N people say I should get at least a 20% improvement in performance after discussing the details and specs of the engine with them.

 

Hey Mandrake51,

How do you get in to spray the belt dressing. Is it behind the cover on the left side?

 

I have two 150's so I am assuming it's the same with the 70cc's...

Sure, in order to access the belt assembly you need to take the transmission cover completely off. It is relatively easy...Taking off the filter from the front of the cover (big black cast aluminum cover) will not work. Only by taking off the black metal face of the tranmission gives you the necessary full access to the belt and it's contact area on the pulleys. You can buy standard belt dressing from any automotive parts store. The belt dressing works becuase there's really (to my knowledge) no provision to tighten such a belt, and if you know how a CVT tranmission works that really would not make too much sense anyhow...) If you're intersted to know how it works, just prop the back wheels up on something so the wheels aren't touching the ground start your engine with the transmission cover off and gently gas the engine. You'll see the transmission change gears based on the pully rpm speed, just don't stick your fingers in there! Quite simple...

Once you take the cover off, spray the belt contact areas and reinstall the cover. The cover is basically held on by several bolts and that's it. You'll also have to remove the kick start lever which is very easy. The only thing to be really mindful of is to make sure that the kick start lever is straight when you replace the trans. cover. You may need to even jiggle the kick start shaft as you replace the cover back on. I have done this process a few times with my Yamoto's...

As a note*, the kick start shaft is somewhat installed with loose tolerances. So when you take the cover off it can jiggle back and fourth a bit. Therefore be sure the teeth on the kick start shaft are in the proper position inside before reinstalling the trans. cover. If you install the cover, and the kick start does not crank the engine, then you installed the cover with the kick start shaft dis-engaged. Sorry to be a bit long-winded but it's not too hard to do, just be aware.

 

I think the 70 and 150 are different. The 70 has a dry clutch design where as the 150 is a CVT belt. The 70 also has no back up start only electric, which is a bad idea anyway. I have a friend that has a 150 and has complained about the sluggish start. I will be sure to show him what you recommended. Thank you for such detail. I sure this will help quite a few people out.

Mark