Author Topic: Help from Italy!  (Read 240 times)

akronos

  • Jr. Member
  • **
  • Posts: 5
Help from Italy!
« on: October 29, 2018, 04:09:29 PM »
Hello everyone, I recently bought a Yamaha TDR 125 Belgarda for 100 , I thought it was fitting the 3mb00 tbarrel, but I noticed (as you can see in the picture) that the 3mb00P series was installed in my country. The head has also marked "P". Reading on various forums the 3mb00P cylinder is mounted on the TZR 125 4DL models with matching the CDI 4DL. On my TDR (which is totally original) a 3mb CDI is mounted. Can you give me some indication? Should I find a CDI 4DL or leave its original?




akronos

  • Jr. Member
  • **
  • Posts: 5
Re: Help from Italy!
« Reply #1 on: October 30, 2018, 02:17:14 PM »
This us my CDI


Chris_

  • Jr. Member
  • **
  • Location: Germany
  • Posts: 20
Re: Help from Italy!
« Reply #2 on: October 30, 2018, 05:19:36 PM »
sorry
« Last Edit: October 30, 2018, 05:55:50 PM by Chris_ »
TZR 125 DL RR Belgarda, Sachs ZZ 125

Louis

  • Hero Member
  • *****
  • Posts: 1362
  • Netherlands
    • TZR3MA
Re: Help from Italy!
« Reply #3 on: October 30, 2018, 08:34:12 PM »
Hello Akronos,

Im not a expert on 125 TDR's but I think what you have seems to be correct.

A TZR Belgarda engine and pipe peeks around 10500rpm (as its designed to be sport/race etc like)
A DTR Belgarda engine and pipe would peek around 9500rpm (as its designed to be more offroad/city etc like)

The 3MB cdi hase a better ignitioncurve to mach a +/-9500rpm peek as the 4DL cdi matches more with a 10500rpm peek

In fact I would be more intended to try a TDR 4BL CDI if your bike peeks around 9500rpm
So if your bike is stock, keep the 3MB cdi. (-P)

But on a other note.
If I look at your second picture from your bike, its wiser to spend your money on other parts than a cdi ^-^
Like a seat, paint, cleaning stuf etc etc ;)
King off all twostrokes ''TZR250 3MA''

akronos

  • Jr. Member
  • **
  • Posts: 5
Re: Help from Italy!
« Reply #4 on: October 30, 2018, 09:05:35 PM »
Of course, I already bought a good part of the pieces. My doubt about the CDI was the fact that the cylinder reports the code 3mb00  "P ", and from what I understand this cylinder is modified by Minarelli in the factory to obtain high revolutions. I do not understand why the TDR has it as standard with the 3MB00 control unit that instead cuts power at high speeds.

I bought a very little money even a 3mb00 cylinder, taken from a DT125R. At this point since the standard TDR mounts the CDI 3mb00 is not advisable to install the cylinder of the DT125R or leave the 3mb00p?


Louis

  • Hero Member
  • *****
  • Posts: 1362
  • Netherlands
    • TZR3MA
Re: Help from Italy!
« Reply #5 on: October 30, 2018, 09:42:15 PM »
Quote
My doubt about the CDI was the fact that the cylinder reports the code 3mb00  "P ", and from what I understand this cylinder is modified by Minarelli in the factory to obtain high revolutions.
That is correct, the "P" are reworked cylinders and heads but there is no real info how much HP that reworking gave
Its not that the 3MB00 has 15HP and the 3MB00 "P" 25HP
Perhaps the difference is around 1 or 2HP? Nobody knows it exacly

The biggest difference should be in the pipe length I think, most likely the DTR pipe is longer then a TZR pipe therefore its peek is a bid lower.
Carb size is also a factor.

Quote
I bought a very little money even a 3mb00 cylinder, taken from a DT125R. At this point since the standard TDR mounts the CDI 3mb00 is not advisable to install the cylinder of the DT125R or leave the 3mb00p?
I would hold it original and use the "P" cylinder, all bids help (on paper it should be better)

If you already thinking off tuning/performing try to do it step by step.
You can see/feel what the changing's do, like bigger carb, or different exhaust pipe, different cylinder or head etc etc.
If you change thinks step by step you will enjoy it longer and understand what did what (-P)
King off all twostrokes ''TZR250 3MA''

akronos

  • Jr. Member
  • **
  • Posts: 5
Re: Help from Italy!
« Reply #6 on: October 30, 2018, 10:54:23 PM »
all right, you're right! However, despite having the CDI 3mb-00 I still recommend the cylinder "p". Obviously I also have the head marked with the letter "p"

2stroke

  • Jr. Member
  • **
  • Location: Italy
  • Posts: 46
Re: Help from Italy!
« Reply #7 on: October 31, 2018, 10:53:05 AM »
Welcome Akronos. :)

I have two TDRs Belgarda, and one of them is tuned for track-only use. 8)

The TDR 125 Belgarda and the TDR 125 R (the bike in the picture you posted) share the same cylinder of TZR 125 R 4DL and the code is 3MB-00 "P". The "P" stands for "ported" version, that is a 3MB cylinder with hand-revised factory porting by Belgarda to have more performance. The power outlet at wheel was about between 25,5hp and 26,5hp, if you have a "lucky" cylinder. Why lucky? Because the porting was revised by hand and some cylinders are more performing than others. Some difference is also due also to piston/cylinder tolerances. ;)

The head should be "P" version. If you have the stock pipe, the CDI has to be marked with 3MB-00. The original pipe is meant to give more boost at midrange, and so are ignition and YPVS curves.

The 4DL CDI version is electrically compatible : also if ignition and powervalve curves are different. But for best performances, you should change the pipe with one that pikes after, as the TZR 125 R 4DL does. And of course also carburetion. This TZR has also the sportier Dell'Orto 32 VHSA carburetor, that makes the difference.

Only the TZR 125 R Sport Production shipped with a 4DL coded cylinder, but this bike was factory deeply tuned and has a dedicated CDI, among an infinity of fine tuned details. 8)

The 3MB-00 (not "P") version has less power due to less aggressive porting, and to the head design.

Keep care of your bike, before you ride, be sure all the components are in perfect conditions.
« Last Edit: October 31, 2018, 10:57:19 AM by 2stroke »

akronos

  • Jr. Member
  • **
  • Posts: 5
Re: Help from Italy!
« Reply #8 on: October 31, 2018, 12:41:40 PM »
Ok thanks! What exhaust can i search to install to my tdr?