Zma handling problem

Hi, guys please help me out with this problem. my zma has started moving in a horizontal wavy motion. It happens when i cruise at 50 and above( generally), the bike starts moving in a cris cross motion and continues till i stop the bike..its scary..it also stops when it goes thru a bump on the road. The people at service station say nothing wrong with the bike, i tried but cant explain them the problem.

How many km has your bike run?

These factors could contribute:

1. Strong crosswinds
2. Uneven chain adjustment, skewed more to one side
3. Worn out wheel bearings
4. Worn out bushes in the rear swing-arm pivot
5. Uneven rear-shock absorber adjustment
6. Unevenly worn out oil in the front forks - this could occur because water enters due to a faulty o-ring (it happened to me, just discovered it today) and messes up the oil on one side.
7. Alloy wheels out of true

I changed my fork oil today (thanks Ravi, for the info!). Replaced the existing oil with Castrol fork oil, 150 ml per side. While the old oil was being drained, I found that one shock's oil was dirty greyish-black which I think is normal, while the other was a dirty rusty brown - a clear sign that water had found its way in. I'd say the amount of water was low, but enough to cause the spring to rust. I decided to change the oil because it was time and this was sped up when I discovered that oil was seeping out of the top of the fork.

I've also experienced the odd wobbling feeling you describe, which is typically set off over one bump on the road and stops a little later, when the bike goes over another bump. Hopefully the oil replacement will mean the end of the problem.

Have done about 6500 km, and havnt changed the fork oil yet, How often should it be changed ? sorry for being so ignorant.

Thanks nirvan for your input, next time i'm gonna hav them check all of the above mentioned points.

Tyre mods

I am thinking of changing the stock tyre with a fat one, what is the fattest tyre i can fit on my zma ? knowing that i will have to obviously remove the chain cover, and will there be considerable diffrence in pickup and top speed ? And please suggest a tyre and if possible the cost.

The fork oil replacement interval to my knowledge is every 12000km. This differs a little between manufacturers and riding conditions. 6500km is on the lower side, so items #3 & 4 probably don't apply to you.


I' believe the fattest tyre that can be fit on a ZMA is a 120 section (I'm probably wrong here though - I've seen some monstrosities). I however recommend that you look no further than a 11/90 or 4.00x18 section. There is no benefit beyond a point when upsizing on tyres, the negatives outweigh the positives by a large margin.

Replaced my stock tyres to michelin front and rear

Metro Tyres fitted michelin 45 110 at rear and made it tubeless

Guys need to know if its okay to use michelin as tubeless

are there any cons also need to know how much loss in mileage can i expect from 110 rear tyre

with stock tyres i was getting 45kms overall

Sundar,
It could be more of lean carb than the oil. Do a plug chop. Meanwhile, HHs are set up very lean for minimum emission. You could also throw the SAI away.

Go for Michelin Sirac 120/90/18". Ravi (ravi@17bhp) should be able to help you with this. I don't think you need to remove the chain cover also.

go michellin/pirelli sport demon....dnt go for the fattest tyre as it will hamper performance ....stick arnd 110...there is a tube type michellin around 110 which is perfect for zma..u dnt even need to remove chain cover...i have it on my zma.....

Check the T cone..has your bike fallen any time?

Ok its time to get a new rear tyre. Currently running on Sirac , 21k completed. No I will major issues in handling while turning to right, bike resist to turn, not sure if its the tyre or smthing else. No bend in fork.
Any way thought of getting a new one.

Options Are :

1. Sirac
2. Dunlop Monster -
3. FKR Ranger - Product Review: FKR Ranger | BCMTouring
4. Kings
5. Suggestions Please

I dont need a road tyre , need a multi porpose like sirac.

Sirac after 21k

^ Ashwin, currently FKRs are not available(i think so)...and out of the above options listed Sirac is the best i guess...

Ohh, any way gonna checkout in j.c road over the weekend for sm other options too.

I guess i'd go for the 120 tyre...i dont think pirellis are available in my town dehradun will try still or else wll go for barracuda...and thanks for your help guys