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TZR125's / Re: 3XV cylinder on a 4FL?
« Last post by Martin77 on October 19, 2018, 11:08:54 PM »
Peak rpm is 90% controlled by the exhaust, not the cylinder. The port timing between them is pretty similar (within reason). As an example my 4FL motor would only peak at 9600 with my first pipe, then 10250 with a different design.

(although fitting the 170 kit took about 500rpm off that)
TZR125's / Re: 3XV cylinder on a 4FL?
« Last post by Toop on October 19, 2018, 10:35:59 PM »
3MB is for DTR ! so poor cylinder ...

11 000/ 11 500 is correcte for a 4FU  ;)
TZR125's / Re: 3XV cylinder on a 4FL?
« Last post by TZRtim on October 19, 2018, 10:30:33 PM »
Should be a 4fu barrel on a 4fl , my 4hw / same bike as 4fl  has 4fu std barrel . Wish mine would rev to 11.5 / if needed - 10.5 would suffice  (-P)
1KT 2MA 2XT 3XC (R1Z) etc Range / Re: Opinions on dyno result
« Last post by claw74 on October 19, 2018, 09:51:50 PM »
Mines got martin pipes and tyyga cans. It showed 51 bhp on dyno.
TZR125's / Re: 3XV cylinder on a 4FL?
« Last post by 41juergen on October 19, 2018, 08:59:54 PM »
So just one other question about the different cylinders for the TZR / TDR's:
I have a 3MB and a 4FU cylinder (mounted on the other bike, so not opend yet). What is the correct barrel for the 4FL setup?
Went out with the 4FU barrel equipped bike and it revs up to 11500 on the counter (ok, may be true 10500-11000 rpm). Is that high typical for a 4FL and what are the Yamaha numbers for max. power @ which rpm (may be for a 4HW or 4HX)?
« Last post by mellorp on October 19, 2018, 08:41:58 PM »
3XV / Re: Major Failure Where to Start
« Last post by Steveog on October 19, 2018, 06:55:48 PM »
This is my final news for this thread. I'll start another for "The Build". Here's what I've arranged for my 3xv Redux.

Martin 77 has my cylinders and heads. He's a great guy to deal with and a real gentleman. Once the Cylinders have been returned, they will be sent to Powerseal (USA) for repair and re-plating. I chose Powerseal because they came highly recommended, were very responsive to my seeking advice and offered analysis of my pictures.

Ordered a new SP Crank (Yamaha OEM) from WebbsLCSpares in Lincolnshire, UK. Andy has been very helpful. The crank should arrive in about 10 days.

Will get Wossner (German) Pistons, rings and clips from JSNook's group buy.

Thanks to Warwick, ybk, Phil M., SeaR1ck and JSNook for your great advice and support during this negative experience. Feeling good about purchases. I just can't imagine what I would have done without the great work done here on this forum.

Warning. Shipping costs are insane. Also, getting parts from UK to US might require a third party, due to the US legal system being so absurdly litigious. I've read that similar goofy issues exist when getting bigger parts from Japan, often requiring a broker to manipulate their system. Not sure about the Netherlands (Yamaha's second largest warehouse). But, I'm guessing shipping expense is still a challenge when I need to go international.


TZR125's / Re: 4fu Tzr engined DTR
« Last post by Martin77 on October 19, 2018, 06:23:12 PM »
This is the V force I used...;

You still have to oval the mounting holes, and it's a tight fit, but it goes in. But the opening is nothing like the 4FL type manifold (same as 2MA etc).

To fit the 35mm carb I had to skim the carb stub, and open out the 2RH manifold to match. The manifold is also a much nicer fit to the V force entrance (and holds the carb horizontal too)... have a look on my project page for pics. I then run a pod filter as no space or motivation to make an airbox.

The carb sits a lot lower to the engine, so mating it to an airbox might be a job! (because it isn't downdraft).

Oh yeah and I had to grind the side off the gearbox breather too.

And fit an oil feed pipe to the manifold.

And make a new lower cable.

And choke cable end.

I can take a few pics if it'll help you figure out what I'm on about..

1KT 2MA 2XT 3XC (R1Z) etc Range / Re: Opinions on dyno result
« Last post by Martin77 on October 19, 2018, 06:10:47 PM »
Yup, looks a bit low to me, with a very flat curve. It's a shame they didn't do a run with the rpm showing as that would explain a lot more..

I guess all you can do is check the usual things like pv etc.
1KT 2MA 2XT 3XC (R1Z) etc Range / Opinions on dyno result
« Last post by xstian on October 19, 2018, 05:56:17 PM »
I've just had my 1kt back from jetting due to a change of exhaust. It's now on martin77 pipes and Tyga cans. It only made 36.1 bhp which is a little disappointing. I don't know what it made before the pipe change.

I thought it would have made over 40bhp, does this seem normal?
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