HOW TO fix broken converter SP1 - SP2 - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 20 (permalink) Old 09-30-2014, 03:19 AM Thread Starter
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HOW TO fix broken converter SP1 - SP2

VTR1000SP1 or Sp2, RVT or RC51 in USA, has a converter unit to boost the electrical signal from the ECU to the pulse generator coils.

Item No1 listed here >>> http://www.bike-parts-honda.com/pieces- ... +RC51.html

This device gets two input 5Volt signals form the ECU (each for each cylinder), and sends out two 100Volt (or something like that) power signals to the pulse generator coils. The input logic goes like this, ECU sends 5V signal, and when a spark is needed, the 5V instantly becomes 0V, this tells the converter to send a 100V pulse.



The problem with the converter is that it sometimes fails. And the bike completely dies of ignition.

This can be caused by faulty generator-rectifier system with abnormal voltage output, or low battery voltage, so if your Converter died, check your generator, battery and R/R before anything else. If you don't repair the reason that fries your converter, it will be fried again.


A new Converter unit will cost something like 500 euros or more , which is not an easy price for everyone.

Here is how you or an electronics tecnhinian can repair it, at a cost of less than 10 euros.

In most of the cases, the converter unit elements that fail, are the ''high power'' output transistors.

These are two pieces of NEC 5P4M and two pieces of NEC 3S4M. Find them on a local electronics store, or order them on e-bay or elsewere. They are not very common and you might wait for some time for your order to arrive.

Once you have the new transistors, the repair steps are:

1.Dig the silicone material in the yellow area. Be very careful not to harm surface mounded resistor nearby. Remove the screws and the metal plate that holds the transistors.


2.Cut the broken transistors out. Leave the pins, as they can be used to easily solder the new ones on them


3.Solder the new transistors on, and put back the metal plate and screws.


4.Test the converter on the bike. If it starts and revs normaly, converter is repaired. Then put new silicon for water and vibration protection.


Ready, enjoy!

Last edited by TheCaracal; 03-24-2015 at 01:10 PM.
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post #2 of 20 (permalink) Old 09-30-2014, 09:45 AM
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Thanks for nothing, how the hell am I supposed to sell the spare one I've got kicking around!?






Just playing man, good diy fix.
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post #3 of 20 (permalink) Old 09-30-2014, 11:24 AM Thread Starter
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Just playing man
I know
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post #4 of 20 (permalink) Old 09-30-2014, 11:31 PM
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This is great news

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post #5 of 20 (permalink) Old 05-19-2016, 09:33 PM
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Has anyone here tried this yet? Wondering how it turned out.

John, 2000 RC51 #000100

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post #6 of 20 (permalink) Old 05-22-2016, 02:37 AM Thread Starter
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Mine's still going perfect
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post #7 of 20 (permalink) Old 05-22-2016, 06:31 PM
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That's good to hear. Looks like a very simple fix, maybe radio shack would carry those transistors?

John, 2000 RC51 #000100

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post #8 of 20 (permalink) Old 05-24-2016, 09:10 PM
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That's good to hear. Looks like a very simple fix, maybe radio shack would carry those transistors?
Doubtful, since Radio Shack is out of business...
However, an electronics supply store could be helpful in cross-reffing the transistors.
You never, know they might find higher quality items as replacements.
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post #9 of 20 (permalink) Old 05-25-2016, 03:14 AM
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I got them off eBay. One from Asia, one from the US. Paid $10 total for both part numbers.
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post #10 of 20 (permalink) Old 10-26-2016, 12:23 PM
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do you know where i can order those?'
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