Cure the backfire (Pegaso 2001-)

[IrishBiker]

I agree with koukosnest. The easy way to find out the value of the resistor is by using a multi meter. If you do not have a meter then there are coloured rings on a resistor which show the Ohms rating. The resistor on my peg was covered in black heatshrink which i cut of and revealed a 4.7Kohm resistor. A 4.7k ohm will have 1st a Yellow ring then a Violet ring and then a Red ring. A 10 K Ohm resistor will have 1st a Brown ring then a Black ring and then Orange ring.

[Jaybee]

Hey - the following web site explains resistors sizing etc. if you dont have a multimeter The heat shrink needs to be removed to check though

http://www.doctronics.co.uk/resistor.htm

[aoro]

Yesterday I measured, that my bike (Pegaso cube 99) have installed 4,7 Khom resistor. Today I hava bought new 10 Khom resistor for onley 6 cents €, which I will installed today.

[bikeral64]

I agree with koukosnest. The easy way to find out the value of the resistor is by using a multi meter. If you do not have a meter then there are coloured rings on a resistor which show the Ohms rating. The resistor on my peg was covered in black heatshrink which i cut of and revealed a 4.7Kohm resistor. A 4.7k ohm will have 1st a Yellow ring then a Violet ring and then a Red ring. A 10 K Ohm resistor will have 1st a Brown ring then a Black ring and then Orange ring.

Thanks Irish that will help. My multimeter is an anologue one which isn't very easy to read. I have just ordered a new multimeter off ebay, digital, so I will be able to check both ways now.

[punisher_uk]

Thanks Irish that will help. My multimeter is an anologue one which isn't very easy to read. I have just ordered a new multimeter off ebay, digital, so I will be able to check both ways now.

i still think a 20cent or pence resistor would have been cheaper bikeral

[koukosnest]

i still think a 20cent or pence resistor would have been cheaper bikeral

Yes,but to own a multimeter is very useful-reading voltages and so on a electric wiring of a motorcycle.

[bikeral64]

Hey - the following web site explains resistors sizing etc. if you dont have a multimeter The heat shrink needs to be removed to check though

http://www.doctronics.co.uk/resistor.htm

Well done useful information!!!

[punisher_uk]

dose anyone now if the EI models have a resistor ?

[punisher_uk]

found this in the manuel is this the same thing ?
it says for them who can understand (not me )
6.7.4 CHECKING THE DIODE OPERATION
 Remove the fuel tank, see 7.1.1 (REMOVAL OF THE
FUEL TANK).
 Disconnect the two-way connector (1).

CAUTION
Upon reassembly, make sure that the electric connector
(1) is correctly coupled.
Using a tester (in diode test mode), check the values between
the two male terminals in the diode, as illustrated in
the figure.
Correct value (measurement A): 0 – 1 Ω
Correct value (measurement B): ∞
In the event the tester does not feature the diode test
mode, power with a voltage of 12 V, placing a 12 V – 2 W
bulb on the positive cable and connecting the diode as illustrated
in the figure.

CAUTION
Do not use bulbs over 2 W, since the diode may be
damaged.
Test (C): the bulb does not light up.
Test (D): the bulb lights.
If the resulting values do not correspond to the those indicated,
change the diode.
 Repeat the procedure for the other diode.

[IrishBiker]

Hi punisher The diodes are controling power to some circuit but not sure which one. They do not operate like a resistor so dont think they have the same function as the resistor on my bike.

[aoro]

Yesterday (after changing resistor) I was driving first time my motorcycle. The difference in driving is amazing! Engine now runs very smoothly, and the engine has now more power and torque. Personally, I recommend anyone to replace that part.

Thank you Bleast for this information!

[Zeus]

Dear Blaest, You are wonderful - thankyou so very very much. Also thanks to Mr Dimpy who wrote the article, and to whoever it was that invented 10K resistors, my special thanks go to Michael Faraday or whoever it was who invented electricity in the first place.

I have owned my Peg since new. I think it is a 2000 model (with carbs) but I bought it at a reduced price in 2002 as it was the "old" model. It was, and is, my first bike. I have ridden nothing else since then (apart from the last week when I bought another Peg to keep the first one company).

I have suffered with poor pulling power at low revs and constant backfiring on overun ever since I bought it. As I have had nothing else - I thought this was normal - though I was never happy.

I have just bought another Peg that runs much better and when I read this thread went staright out to the garage to find the recent purchase has 10K fitted, and my trusty old stead has the 4.7k fitted. I swapped them over and took the old girl out for a ride. What a difference!!!!

It is fantastic! I have been out most of the day. Smiling all the time - which is unusual as it is blowing a gale here in Scotland so riding a bike is a bit scary, but that has not made me stop smiling.

What a wonderful thing a little information is.

Now, it got me thinking...... what other values can be used, and how does the resitor vaule relate to advance / retard of the spark? Has anyone tried other values - I was thinking of fitting a 0 to 20k 2W potentiometer (variable resistor) so it could be adjusted "on the fly" - could even wire it up to the handle bars I suppose.

I guess the biggest variable requiring ignition timing adjustment is fuel quality/octane rating but other than that I can't see you would really need to make it adjustable - just seeing what you guys think....

Cheers
Zeus

[rob100961]

Punisher,

The diodes your picture, and write up are refering to live under the tank.

They are part of the engine cut out/ kill switch circuit. This has the side stand, and kill switch wired in with it also.

Rob

[babelbabek]

hello!

the link to the guide in op´s post is no longer working, so does anybody know where the connector is housed that holds this 4.7 kohm resistor?

i am asking because my peg developed a backfiring issue, might be that it was due to the cold weather (0c), but might as well change the resistor as i see that most people have had positive experience from changing it?

thanks!

[babelbabek]

hello!

the link to the guide in op´s post is no longer working, so does anybody know where the connector is housed that holds this 4.7 kohm resistor?

i am asking because my peg developed a backfiring issue, might be that it was due to the cold weather (0c), but might as well change the resistor as i see that most people have had positive experience from changing it?

thanks!

replying to my own post, as i found the connector under the seat, and it indeed holds the 4.7 -> 4.8 kohm resistor innit, so i am going to try and replace it with 10 kohm one, anyone got any experience on what the wattage of the resistor should be, 0,5W enough?, might as well put a 2W in there i guess, not much price difference...

ill report after i get it done, on how it did affect the backfiring issue...

does someone know what does this 4,7kohm -> 10kohm resistor change does? its something to do with the spark advance, so does it retard / advance it?

another question on air mixture setting on stock carbs, the airscrew is 2 turns (out?) as standard setting, and if i want to go less lean / richer which way is more rich, and can you adjust the air mixture screw without taking the carbs out?

thanks!