Derestricting my TZR 250 3XV RS

[AndyYam]

Yes a rubber mallet/hammer is good to have. And I use my plastic hammer a lot.

Other useful tools bearing / race installer kit.
Blind bearing puller kit

+1 for the blind bearing puller. Used mine today to get wheel bearings out. If you think you might need I can drop by on a Friday / Sunday evening. I drive by your way every week Rich.

[AndyYam]

Oh, just to keep things the same side, I'm using red and green zip ties on everything that comes off, corresponding to red and green zip ties on the brake/clutch levers.

I love this. So organised and your future self will be very happy!

[SouthCoastRich]

Yes a rubber mallet/hammer is good to have. And I use my plastic hammer a lot.

Other useful tools bearing / race installer kit.
Blind bearing puller kit

+1 for the blind bearing puller. Used mine today to get wheel bearings out. If you think you might need I can drop by on a Friday / Sunday evening. I drive by your way every week Rich.

Thanks 
I'll give you a shout when I get into the rolling parts!

Here's the broken socket I was using to try to get the barrels off, and the right tool I got to take the other one off. Right tool for the job? Absolutely!

Oh, just to keep things the same side, I'm using red and green zip ties on everything that comes off, corresponding to red and green zip ties on the brake/clutch levers.

I love this. So organised and your future self will be very happy!

Makes a difference when there's days between disassembly and assembly! I couldn't remember the most obvious so similar parts for different sides was a concern without a system.

[SouthCoastRich]

Shout out to Dan McB (maccas here on the forum) for a complete set of TZR 3XV gaskets.

Eagle eyes will spot 2 sets of base gaskets. Different thicknesses.

I'm rounding up the parts I didn't know I needed to order, a few bodge holes to fill, but a couple of Q's...

- Should the copper washers under the domed head nuts be replaced with new?
- Is it prudent to get a new #13 (whatever that is) when fitting the new crank?

[SeaR1ck]

The copper crush washers on the head should be replaced. If you want you can heat them up but must be red hot they will aneal themselves and can be reused.

[SouthCoastRich]

The copper crush washers on the head should be replaced. If you want you can heat them up but must be red hot they will aneal themselves and can be reused.

Thanks 

[jamietzr250r]

AHH no13, chicken satay....


A locating shim?

[Warwick]

There's no need to replace the bearing locating half ring unless it's damaged in some way. Highly unlikely as it just spends its life sitting there (barring some kind of catastrophic failure of course).   

[SouthCoastRich]

AHH no13, chicken satay....


A locating shim?

There's no need to replace the bearing locating half ring unless it's damaged in some way. Highly unlikely as it just spends its life sitting there (barring some kind of catastrophic failure of course).   

Thanks Warwick - any money saved now is too little, too late but always welcome 

[SouthCoastRich]

Here are a few pics of the inside of the SP Tado Jackal end cans. Looks like there's quite a bit going on in there. Theory I've seen says the big 2T tuning considerations are insignificant beyond the end of the stinger, but I'm musing that this arrangement would "increase" static pressure.

Heads, barrels & PVs are on their way to Martin, coming in the other direction from the USA, with massive help from Steveog, are replacement cylinder head nuts and a new NLA woodruff key.

The next step for me - split the cases & place a final parts order for small stuff

[yanw]

Yes, wadding does increase back pressure. With my similar end cans I drilled the big head rivets, repacked with motocross wadding and then used some new big head rivets to get them back together.

If "post stinger" isn't important I'd expect two similar dyno runs, one with end-cans and one without to be the same. Myself I think there probably would be but I guess it's down to the port timing/expansion chamber profile and stinger being in synch with the end-cam (and vice-versa).

[mellorp]

The body of the pipe up to the stinger defines the resonant frequency of the exhaust gas. As I understand it the stinger length has little bearing on this, as you can inverted stingers that stick back into the expansion chamber,  and the end can is merely for silencing. However I run JL TZ style 2 bolt long big bore end cans on my 3XV/TZ hybrid. Not only do they give good power, let the motor rev and it still remains pretty quiet as well. IMO they are the best end cans you can buy

https://www.jl-exhausts.com/yamaha-tz250-v2-modern-426-c.asp

[Scotty4321]

The stinger diameter and length are important but only to the back pressure, just as the silencer is.
Honda use the stinger Back into the baffle cone for back pressure.
Think you are right that the stinger has no effect on the tuned lengths. This is just A measurement from port to baffle cone centre.

[SouthCoastRich]

NLA Woodruff key from RSC & great condition cylinder head nuts all the way from the USA 

Massive thanks to Steveog for getting this all put together and sending it over to me  You're a star - thanks again!

(Oddly enough it twas almost quicker to arrive all the way from Indiana across the pond as it was to send my barrels 120 miles down the road to Devon  )

[Steveog]

Good news, Rich. Thanks for your kind words.

Shipping from UK to Indiana is unpredictable. Mostly, excellent, but it took two months for two liters of A747 to get to me. Not sure why that stuff is not available in the US.

Good luck on your build.

Steve