Zuma rear wheel getting hot

[shift]

***It's not brakes rubbing***

Ever since I bought this used Zuma, the rear hub gets hot after a mile or so of riding. Opening the cvt cover, the bell housing on the clutch has 2 blued marks on it from getting hot. I replaced the gear oil a few hundred miles ago to be sure that wasn't the issue, and nothing changed. I am wondering if the clutch is causing the issue, and if so, if it is an adjust or replace situation.

Zuma has about 3500 miles on it. I replaced the belt on it today as the last one was a little glazed and worn.

[Zino]

If you have the tools take pictures of your clutch bell and clutch assembeled and disassembelled .

While you are in there you could clean the bell and pads up with some brake cleaner or rubbing alcohol .
If the pads are glazed a light scuff with sand paper helps
You also you scuff up with sand paper the inside of the bell .
Just some light scratches perpendicular to the way the clutch spins.

You might be having clutch slip.
Could be weak springs broken spring or glazed clutch

here is a Video by Brent for inspecting and disassembling the whole cvt
www.youtube.com/watch?v=2EjW-iSP-Q8&t=9s&ab_channel=49ccScoot

[shift]

Thanks for.the reply Zino.  This is the better of the 2 pictures I took yesterday.  

I did come.across that video while trying to figure out my issue.  I have so many ongoing projects I forgot about that video.   I'll try to tear into the clutch today and see what I can find.  Thank you.

If I needed to replace the clutch, do you have any recommendations?

[Zino]

I have run polini speed malossi fly clutches just the standard sport clutches are cheaper and a upgrade over stock clutches ..
The racing clutches are way overkill for most builds

If this is a 2002 -2005 has 105mm clutch so you will need a clutch and bell package .

Like this
scooterpartsco.com/yamaha-yamaha-zuma-50-2-stroke-c-95_3583/malossi-fly-clutch-and-bell-for-yamaha-minarelli-50cc?zenid=0756f95acb0875066b887363071b2be3

I have the most experience with the italian parts or stock parts but I have been impressed with the naraku and Ncy brands from Taiwan on the parts that I have come across.

[shift]

Thanks again Zino. I appreciate the recommendation. 👍

I mainly cruise between 5-10mph on gravel roads as I walk and run my dog 5 to 8 miles. I used a laser thermometer to check the temps today when I got back. The variation cover ranged from 101 to 121 and I think the hub of the rear wheel was 118. (Temp here is 78°)

Am I overreacting? Is this normal?

I did pull the clutch out, bell off, scratched the bell surface a little with 80 grit and the pads too. I *think* it helped. Not having a beginning reference temp doesn't help.

[geoffh]

That style of riding won,t help are you constantly on/off the throttle to maintain those low speeds,if you are the clutch is working hard, try a run without the dog and check the temp.

Geoff

[ThaiGyro]

Hi shift....I am also thinking what geoffh said above. I lived in Thailand for many years. Our scooters, of different manufacturers all had some higher heat generation from off-road riding as geoffh suggests. Our scooters in the North were subject to many varied road conditions. We had a Vespa that kicked butt, until off-road...where it had clutch issues. Of note: that excess on/off can input crazy heat...near the hub...near the bearing.

The fix is cruise it smoothly on dirt...tune the clutch as suggested above..check that the bearing is installed properly...upgrade the bearing material if all else fails.

Warning! Do not be tempted to vent your cover, if you travel off-road. It will cause more problems. As others have asked...do you have pictures?

[geoffh]

From the workshop manual 5:3:6 get a trailer for your dog 4:6:1 release the dog most return when hungry 4:6:2 construct a dog sized hampster wheel to save gas and tyre wear


Geoff

[shift]

I do not think this is a low speed, on/off throttle issue. I first noticed it a year ago when I first got the scooter, testing it around my block -- about 3 miles, all pavement.

After about 3 miles of 15-20 mph cruising,  I did test going up a slight incline for about 2 miles (maxed at roughly 30mph), then temp checked. Went back down (maxed at roughly 39) and temp checked. Definitely hotter with constant throttle. Faster equals more heat.

3 spots I checked:
Top front of the cvt cover
Rear of the cvt cover
And rear hub

Pics in post below after both tests, last being about 2 miles, going 35-40 slight downhill.

[shift]

[shift]

Do those seem like normal temps?

[shift]

Jul 15, 2021 15:42:37 GMT -5 shift said:

Do those seem like normal temps?

So I established this "heat" is not from on and off throttle inputs. I've been an instructor for motorcycle track days and understand and employ smooth throttle inputs. I'm typically cruising on hills. So on throttle uphills, and off on downhills.

I've posted pictures of the temps I'm getting. Can anyone confirm if this is normal temps for a rear wheel and front/rear of the cvt cover?

[aeroxbud]

I haven't got a battery for my temperature gauge. But after riding home on the typhoon, eight miles. The temperature seems about right to my hand. 🙈
Didn't check the wheel but CVT cover, top of cases was very hot. Interestingly the rear brake, where the shoes goes was a lot cooler.
The CVT will always get hot. When doing comparisons between rollers. If I don't let it cool down, I have to wear gloves.

[Zino]

I rode 12 miles mostly wide open .
I run close to your temps on both the transmission and rear wheel.
I temped at 110 on the clutch variator and 98 on the brake .

[Zino]

Ran a another 1/2 hour run
110 degrees on the transmission side and 100 degrees on the drum brake .