Just in from starting a rebuilt stock 650 motor using a Gonzo system. Started and ran well, advanced perfectly. This motor is a repower for our sidecar which is going to be sold (keeping the race motor as spare for new bike). Next Sunday is the have a go day where members of the public buy tickets and get to have a go at swinging.
The upshot is the bikes do a lot of laps and any weaknesses in the system will be exposed.
I will report back.
Rudy, can you share with us any more info? Did you have to change the timing any when you installed the GN box? Have you noticed any change in performance.... power... milage... anything?
I might have fine tuned the timing when I set it up. Power? No. Not really. It certainly did not go down! MPG went down around 5 mpg. I blame that on 2nd OS Pistons and carb jetting after the top end rebuild. No regrets doing it. Super easy peasy and very affordable to do. Thanks to Jim for showing the Pre 80 guys it can be added to Standard bikes.Ya, me too ?
2700 RPM RM-1 Pickup test with reluctor
CH1 the negative terminal on the coil.
CH2 blue across pickup
2700 RPM full advace
View attachment 191355
Note the PP Voltage on the pickup coil. That is the minimum voltage that the Gonzo will signal a fire in the coil
View attachment 191356.
Notice the 20v PP ringing in the ignition coil.
I don't want to hijack this thread, but I've been following it over the last few days since I'm stuck in my '81 Heritage Special rebuild at dead pick up coils.
Watching the oscilloscope pictures
Correct me if I get this wrong
The blue is the pickup
And when it maxes the yellow goes low ..firing the plug
and then yellow begins to load the ignition coil shooting over ( 8 V ?? )
But at some of spikings it rings downwards very low immediately after overshoot.
Cant that negative spike try to fire the plug again directly after.
No Hijack. This is what this tread is built for. Welcome to the forum.
The stock TCI used a unique retard - advance pickup design. Haven't found any easy replacements.
Are both sides of the pickup dead.
@Jim is working on a replacement crank mounted pickup but none of the replacement pickups will work with the stock TCI Igniter . It will require a Gonzo system.
The last few my posts here are notes on the design of of a cam mounted pickup for the Gonzo which may be easier to fabricate.
I've got one that tests good.... with the connector cut off. I'll let you have it for much less than that. PM me if you're interested. At least that will get you back on the road until we sort out the conversion.I was kind of surprised I couldn't find any used ones online (< €200) or aftermarket replacements at a specialised shop nearby. To my knowledge the only option is to replace them with used ones or completely swap the ignition system.