YZ 490 TLS backing plate

[bishboy]

I have a couple of YZ 490 twin leading shoe backing plates. 

The first one looks to be in very good condition and looks to be powder coated  $200 shipped

The second one is in good condition and looks like its been painted, but is missing a couple of things. It's missing the cotter pin on one of the arms (it's just got a bit of race wire on there at the moment) and doesn't have the spring on the outside.  $175 shipped


Bump......

Just the thing needed to upgrade your pre 85 brakes 

[KTM47]

Please note!!!!  Only YZ465 twin leading shoe brakes are legal for the Evolution class.  Parts of non EVO legal bikes can not be used in EVO bikes.  So YZ 490 brakes and forks are not legal.

[Ted]

It's OK Kev, Andrew is not trying to mislead anyone. He plainly says they are for a 490. He is also selling a pair of 490 forks in which he states he fu..ked up himself thinking they were for a 81 465. It's all good if you have a Pre 85 and need some forks and brakes.

[bishboy]

Yeah, wasn't trying to mislead anyone, that's why I'm selling them as I bought the forks and one TLS in a blonde moment and the other TLS, the seller told me it was a 465 one

Also, a good upgrade for those single leading shoe brakes, pre 85 or pre 90 only though 

[tony27]

Will fit the 465 hub but not the forks, locating lug is 45deg out

[KTM47]

I wasn't implying Andrew was trying to mislead anyone, but I did want to make it clear that this could become an issue, particularly at the Post Classic MX Champs.  I may be in a position to make some billet TLS backing plates to suit the 1981 forks.  Would anyone be interested.

Kevin

[Sorelegs11]

They came out standard on 81 IT465s so why could you not fit one to a yz?

[Davey Crocket]

This is where everybody gets confused........they are different parts....the lug is in a different position.....J models have it at 3 O'clock...H is at 1.30....forks are totally different....J has adjustable rebound on the bottom.

[holeshot buddy]

yz 490 j forks dont have adj comp on bottom  they are the same as 465 forks just diff lug for brake
big advantage apparantly
but everyone runs pd valves 

[KTM47]

yz 490 j forks dont have adj comp on bottom  they are the same as 465 forks just diff lug for brake
big advantage apparantly
but everyone runs pd valves 

You are making a good point, but the forum doesn't decide what is legal or not.  Why not email the Classic MX & DT Commission through MA and ask them to consider them as carry over parts.

[Ted]

And you may have an answer by the time you reach 150 years of age

[Paul552]

I wasn't implying Andrew was trying to mislead anyone, but I did want to make it clear that this could become an issue, particularly at the Post Classic MX Champs.  I may be in a position to make some billet TLS backing plates to suit the 1981 forks.  Would anyone be interested.

Kevin

So would they be legal? (not a piss take a serious question)
If you copied a period braking part and made it from solid would it qualify?

[Ted]

Is a Karl Landraus swingarm legal? If you can answer that there's your answer.

The rules are vague Paul. Simple but open to conjecture.

I'm just waiting for the day a guy fits a supercharger inside his motor housing ( thus not altering its external appearance ) and turns up

[holeshot buddy]

nitrous would be better

strange how everyone goes on about certain model bikes rm swingarms etc
eg yz forks when there is stuff all differance the tests back in the day said the J forks
were worse than the h go figure that main reason people use them is availiability of h forks
scarce as seems funny how most maico riders run billet backing plates and torque arms and pd valves
none of which were avaliable back in the day 

[KTM47]

I wasn't implying Andrew was trying to mislead anyone, but I did want to make it clear that this could become an issue, particularly at the Post Classic MX Champs.  I may be in a position to make some billet TLS backing plates to suit the 1981 forks.  Would anyone be interested.

Kevin

So would they be legal? (not a piss take a serious question)
If you copied a period braking part and made it from solid would it qualify?

The various billet alloy Maico backing plates that are around to my knowledge have never been challenged, including the twin bolt ones, which appeared to be considered a saftey issue.  So why wouldn't a billet alloy reproduction of the 1981 YZ TLS brake also be OK.

As for the Karl Landraus swingarms etc, if they were an exact replication of swingarms that were used in the day (eg Thor etc) in my opinion they would be legal, but Karl adds modern features which makes them illegal.

Also another point.  The old YZ (and other brands) hubs and backing plates are magnesium and these can fail with age.  So it can be considered a safety issue.  This is the main reason the Maico backing plate is replaced the bolt hole that holds the brake stay arm on can break.