OP
UTC

Member
2010 GTS 300ie Super
Joined: UTC
Posts: 25
Location: Reno Nevada
 
Member
2010 GTS 300ie Super
Joined: UTC
Posts: 25
Location: Reno Nevada
UTC quote
We've all heard of the dreaded 'notch' issue. I had it on my 1st MP3 from 2009. It's not a nice feeling and it stopped me from driving it.

So yesterday, my 2016 MP3 felt unbalanced going down the road. I tried doing some S turns - nope. I had this weird feeling that I was going to tip over. My mind immediately thought 'NOTCH'. But I couldn't feel any notch unlike my other bike.

Turns out I had 15 PSI on the right front tire and 35 on the left! Set both to 29 this morning and like magic my bike was back.

The moral of this story should be obvious. Tires can make all the difference in stability and making sure they are in good, working condition should be your first priority and your first check when you have front-end-stability issues.

2016 and later MP3s aren't as well known for the notch issues seen in the earlier models. But like all bikes, and especially trikes, it still happens especially if the first check-up lube is neglected.
@berto avatar
UTC

Molto Verboso
2006 LX150 (carbed) | 2007 GT200
Joined: UTC
Posts: 1925
Location: Toronto
 
Molto Verboso
@berto avatar
2006 LX150 (carbed) | 2007 GT200
Joined: UTC
Posts: 1925
Location: Toronto
UTC quote
Seems odd for tire pressures to be so far off? Are you sure you didn't pick up a nail?
@stickyfrog avatar
UTC

Moderatus Rana
MP3 250 and 2 MP3 500s
Joined: UTC
Posts: 22659
Location: Nashville, Indiana
 
Moderatus Rana
@stickyfrog avatar
MP3 250 and 2 MP3 500s
Joined: UTC
Posts: 22659
Location: Nashville, Indiana
UTC quote
Yeah pretty well known for a decade that uneven tire pressure on the fronts is squirrely but thanks for brining it up for those that dont know.
UTC

Hooked
Aprilia Mojito 125
Joined: UTC
Posts: 474
Location: Chelyabinsk, Russia
 
Hooked
Aprilia Mojito 125
Joined: UTC
Posts: 474
Location: Chelyabinsk, Russia
UTC quote
Also the bike kinda "counter-steers" a bit in straight parts of your trip and thus is willing to turn to the opposite way of underinflated tire. Kinda the right tire is low in pressure and thus lower in shape, so the handlebar is a just a bit turned to the right as if you pushed the left grip, so the bike tries to steer to the left.
UTC

Hooked
2008 fuoco
Joined: UTC
Posts: 437
Location: United Kingdom.
 
Hooked
2008 fuoco
Joined: UTC
Posts: 437
Location: United Kingdom.
UTC quote
Thats a heck of a difference in tyre pressures and why did you have 35psi in the left or is that a miss type, Can i assume 29psi is for the 13" front tyres as the 12"fronts are 23 psi and as i changed my fuoco/mp3 500 to 13" fronts i'm still running them at 23psi and seem ok.
randyjsmith wrote:
We've all heard of the dreaded 'notch' issue. I had it on my 1st MP3 from 2009. It's not a nice feeling and it stopped me from driving it.

So yesterday, my 2016 MP3 felt unbalanced going down the road. I tried doing some S turns - nope. I had this weird feeling that I was going to tip over. My mind immediately thought 'NOTCH'. But I couldn't feel any notch unlike my other bike.

Turns out I had 15 PSI on the right front tire and 35 on the left! Set both to 29 this morning and like magic my bike was back.

The moral of this story should be obvious. Tires can make all the difference in stability and making sure they are in good, working condition should be your first priority and your first check when you have front-end-stability issues.

2016 and later MP3s aren't as well known for the notch issues seen in the earlier models. But like all bikes, and especially trikes, it still happens especially if the first check-up lube is neglected.
OP
UTC

Member
2010 GTS 300ie Super
Joined: UTC
Posts: 25
Location: Reno Nevada
 
Member
2010 GTS 300ie Super
Joined: UTC
Posts: 25
Location: Reno Nevada
UTC quote
3legsofman wrote:
Thats a heck of a difference in tyre pressures and why did you have 35psi in the left or is that a miss type, Can i assume 29psi is for the 13" front tyres as the 12"fronts are 23 psi and as i changed my fuoco/mp3 500 to 13" fronts i'm still running them at 23psi and seem ok.
29 psi (2 bar) is what my 2016 manual states for the front tires.
UTC

Hooked
2008 fuoco
Joined: UTC
Posts: 437
Location: United Kingdom.
 
Hooked
2008 fuoco
Joined: UTC
Posts: 437
Location: United Kingdom.
UTC quote
Think i will up my tyre pressures from 23 to 29 and see if it improves handling.
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