hi
I have this cheap XR500R from 1983. I bought it as non running and it has nighmare electric system and spark is weak as hell and very occasional. I dismantled the motor during winter because there was very little compression when kicking the engine.
I used various methods to fix it as cheaply as possible. Made own gaskets. Welded the cracked cam gear, joined two old TLS cam chains together and made new chain out of them. Also the piston pin was little scored so we lathed a new one.:devious
polished the valves to get good seal and looks like now there is a nice compression in the engine. But I need spark. I know the CDI works, but the exciter coil is too weak, so the spark is very hard to get. I measured the exciter and it's only 200ohms. it should be 320. ? and it show that the output is somewhere around 15volts, even the exciter should generate anything up from 30 to almost 200volts.
I could rewind the generator, but i'm too lazy:laugh so I was thinking about new hack mod. I noticed that the light generator is ok and that makes something like 12-16 volts. I have transformer that converts 220volts to 24 volts. so it's 10:1. My plan is to connect the transformer opposite to it's original way and use it to raise the lightcoil voltage to the cdi level. 12volts ->120V. and use that to drive the CDI.
so what is the verdict, am I going to kill my self with it or is it ok to do it like this?:coocoo
JarkkoT.
I have this cheap XR500R from 1983. I bought it as non running and it has nighmare electric system and spark is weak as hell and very occasional. I dismantled the motor during winter because there was very little compression when kicking the engine.
I used various methods to fix it as cheaply as possible. Made own gaskets. Welded the cracked cam gear, joined two old TLS cam chains together and made new chain out of them. Also the piston pin was little scored so we lathed a new one.:devious
polished the valves to get good seal and looks like now there is a nice compression in the engine. But I need spark. I know the CDI works, but the exciter coil is too weak, so the spark is very hard to get. I measured the exciter and it's only 200ohms. it should be 320. ? and it show that the output is somewhere around 15volts, even the exciter should generate anything up from 30 to almost 200volts.
I could rewind the generator, but i'm too lazy:laugh so I was thinking about new hack mod. I noticed that the light generator is ok and that makes something like 12-16 volts. I have transformer that converts 220volts to 24 volts. so it's 10:1. My plan is to connect the transformer opposite to it's original way and use it to raise the lightcoil voltage to the cdi level. 12volts ->120V. and use that to drive the CDI.
so what is the verdict, am I going to kill my self with it or is it ok to do it like this?:coocoo
JarkkoT.