Voltage regulator TEMPERATURE – Virago 250 – Does yours run too hot?


Voltage regulator TEMPERATURE  – Virago 250 –  Mine stays cool if bike is moving, but gets too hot in stop-and-go traffic or idling.

I recently added a temperature gauge to my Virago 250 voltage regulator.

The voltage regulator on some Virago 250’s runs too hot – it is good to be below  120° F or 47° C.  At this temperature, it will burn you if you hold your hand on it for a few seconds.

Fahrenheit

At 79° F ambient – on the highway at 65 mph, the voltage regulator ran at 106° F to 109° F.

When I slowed down it went up to 112° F.

When it became breezier, it went down to 103° F.

At 70° F ambient – at 50 mph, it ran at 93° to 96° F.

At short red lights, it went up about 5 degrees F.

At longer red lights, it went up about 10 degrees F.

Highest reading:

– when moving over 50 mph:  125° F  (ambient 88° F)

– in stop-and-go traffic:   152° F  (ambient 88° F)

Lowest reading:

– when moving over 50 mph:  86° F (ambient 66° F)

Do not idle the Virago 250 for more than about a minute, if possible.

The voltage regulator will get too hot – idling for 3 minutes it will go up to 142 degrees F or more.

Celsius

At 26° C ambient – on the highway at 65 mph, the voltage regulator ran at 41° C to 43° C.

When I slowed down it went up to 44.4° C.

When it became breezier, it went down to 39.4° C.

At 21° C ambient – at 80 kph, it ran at 34.0° C to 35.6° C.

At short red lights, it went up about -15 degrees C.

At longer red lights, it went up about -12.2 degrees C.

Highest reading:

– when moving over 80 kph:   52° C (ambient 31° C)

– in stop-and-go traffic:    67° C  (ambient 31° C)

Lowest reading:

– when moving over 80 kph:   30° C (ambient 19° C)

Do not idle the Virago 250 for more than about a minute, if possible.

The voltage regulator will get too hot – idling for 3 minutes it will go up to 61 degrees C or more.

———————

What to do to help your Virago 250 voltage regulator run cooler:

These are just ideas at this point – I am going to try them to see if they help.

1) Attach another heat sink to the voltage regulator.  If you have an old Virago 250 regulator, try that – it should fit great – mount it underneath the regulator, base to base – you want to get as much metal to metal contact as possible.

2) Leave the left plastic sidecover off.  Use sealant on the electrical connector.

3) If you need to idle your bike for more than a minute, put a fan on it.  This will help the engine run cooler as well.

The last two only help  if the bike is moving (the voltage regulator overheating is usually not a big issue when the bike is moving)

4) Put a piece of plastic above and slightly ahead of the regulator to serve as a wind deflector to direct more airflow to the regulator.

5) Put spacers or washers under rear of regulator to angle the rear out so it will get more airflow.

———————

This will make your Virago 250 voltage regulator run hotter:

I added lower fairings to my Virago 250, and the voltage regulator ran 14% hotter (when bike is moving).

———————

Tips to help make your Virago 250 a little faster.

This is what worked for me:

1) check tires often (it can make a huge difference in performance)

2) pilot screw adjustment 3/4 to one turn out

3) removing parts for weight reduction (I have removed 40 lbs so far)

4) lost 10 lbs myself

5) O-ring or X-ring chain

6) iridium plugs

7) new, larger air filter

8) FUTURE –  I want to convert my rear wheel to tubeless and replace my 140/90-15 Pirelli (17.1 lbs + tube) with a 130/90-15 Kenda Challenger (12.5 lbs)

The factory recommended tire pressure for Virago 250 is:

25 PSI Front / 29 PSI Rear – for up to 90 KG (198 lbs) load.

29 PSI Front / 32 PSI Rear – for over 90 KG (198 lbs) load.

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2 Responses to Voltage regulator TEMPERATURE – Virago 250 – Does yours run too hot?

  1. Bhola Tamang says:

    I have virago vx 125 1995 model. My regulator is damaged and could not get one in the place where i stay. I managed to get a regulator of kawasaki ninja 250 . Is it compatible with virago 125. Please advice.
    Thank you.

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