3 replies to this topic

[Dellers]

Hi All I Have a old Vintage Kyosho Optima, My Race Car I used when I Was a kid and I Have Restored it to its Glory but when I run the car the resisters get very HOT that they melt the plastic tie that holds them to the car.
I have never had this problem before and when I first Brought the car all them years ago it was fine.
So I was wondering do Resistors perish with age?

The Resistors are part of the old mechanical speed controller and as this is all original would like to keep it all on the car and just show it off every now and then as my party peace I Have Used a Esc on the car which would eliminate the need for resistors but this was like putting a new engine in a old car and the car looked fragile and very fast as parts are getting expensive now (Drive shafts alone went for £45 on ebay.) and a Young son who will probably find it and take it for a spin lol NOOO! ]

[bromvw]

Hi All I Have a old Vintage Kyosho Optima, My Race Car I used when I Was a kid and I Have Restored it to its Glory but when I run the car the resisters get very HOT that they melt the plastic tie that holds them to the car.
I have never had this problem before and when I first Brought the car all them years ago it was fine.
So I was wondering do Resistors perish with age?

The Resistors are part of the old mechanical speed controller and as this is all original would like to keep it all on the car and just show it off every now and then as my party peace I Have Used a Esc on the car which would eliminate the need for resistors but this was like putting a new engine in a old car and the car looked fragile and very fast as parts are getting expensive now (Drive shafts alone went for £45 on ebay.) and a Young son who will probably find it and take it for a spin lol NOOO! ]

I think you'll find that the resisters have perished . What happens is that the casing fails with time . The old resistors used ceramic as the insolator . In time the varnish comes off and because the ceramic is porous it takes in mosture from the air and corrodes . Replace them and all should be well again . if you have access to a multi meter check them before replacing . If you can'nt find replacements Tamiya ones may work so long as they match the resistance rating . You could even use a Tamiya MSC and resistor set up depending on the motor you use . Their fine with a sport tuned ect - black can .

[Dellers]

Thanks For the info I have brought a "Kyosho SC-105 Optima Scorpion 2 Resistor Set" Straight from ebay and hopefully this will do the trick
I Thought this was the case as they look past there best and a slight chip off the side from the over heating and wear
Like I said thanks for the info

[Dellers]

Got My New Resistors and replaced them but I think Iv Fried my receiver . The 7.2Volt Battery Runs Straight into the receiver relying on the BEC to do its job but I Think an over load from the battery has cooked it
instead of the heat or access power going to the resistors it has gone to the receiver.
Now all the Receiver does is over turn the steering servo , I Have swapped servos around and found that it's the steering channel only that causes the servo to over turn and lock up, the servo for the forward and reverse works okay.