[jakew129]

So i recently had sport demons mounted on my EX500, 110/70 front and 130/70 rear, both stock sizes, i took the tires off the bike and had them mounted and then re-installed the tires on my bike on my own. Then after riding it for a little bit, i have noticed a little bit of a shake in the handle bars, i only feel it in the front, and it almost feels like im going over a bumpy road, only it does it on fresh asphault. And i dont notice it under hard or even normal acceleration, but i do notice it quite well at a maintained speed. Could i have installed them wrong to cause this?...they rechecked the tires for me but it was balanced, and i will note the front tire took quite a bit of weight, i think 4 (1/4) oz blocks on each side of the rim on the front tire.

the other thing....during the re-installation of the tires, i had for some stupid ass reason decided to mount the rear tire on first while the front forks were resting on a 6x6 block of wood and the bike was on the center stand...while mounting it on my own, the bike crept forward and the center stand retracted but the bike was still resting on the 6x6, only i didnt realize this i thought my baby was MAN OVER BOARD!!! so i put my weight on the rear end causing the front forks to slip off the 6x6 and onto the concrete floor, it didnt SLAM the floor, but smacked it, if there is a difference, is my front forks the cause of this uneven almost wobly feeling up and down the cause of my problem....

Someone please help, and try not to bash me for doin sumthin stupid, although i do deserve it

 

[fog]

Jake,
I don't think the bump on the floor is the cause of anything. Your front tire that required 9oz of weight does seem odd. Most Motorcycle tires , for that matter most any kind of tire will balance out way before that. If you pick up the front and spin the wheel does the tire look straight? the other possability is the rear wheel is not aligned. Read "The String Thing" in the trouble shooting section.

I'm very suspect that you have a "Bad" Tire.

FOG

 

[maverick9611]

jake chk your tires real close light witha flashlight with your head right next to them. many times the imperfection can be seen aka a bulge

 

[jakew129]

so u think i possibly have a bad front tire huh?....ok well i will check that out, do u think i should look into buying a new front rim, i mean if its balanced, its balanced right....?

 

[fog]

Well "Balanced" Don't mean true,round or concentric. It just means that from a energy point of view the is equal energy stored all the way round. That's why I said spin it and look at it to see if it runs true.
If it does, Headshake can be caused, by several things. Loose head bearings , or a rear wheel that is trying to go someplace diffrent than the front.

FOG

 

[gsjack]

There were a couple other reports of head shake with the Sport Demon front tire on the Ninja 500 on the old EX500riders forum. Can no longer access that forum.

 

[Administrator]

I recently got a set on my bike, and it's been fine. There's the slightest hint of vibration at 90+, but I've attributed that to my slacking, lazy-a$$ dealership not aligning the rear properly after the tire install.

 

[ninjamon]

I recently put new tires on my 500r. Based on feedback in the ex500riders forum I did not get the sport demons...seems like there were several reports of vibration issues. Instead I got the pilot activs(110-70 and 130-70). They have been very smooth, although I don't get up to 80-90 mph as some do.