CDI Conversion Cheep

[Daryl]

Was pondering the costs of replacement coils & avalability. Why not use a whipersnipper CDI coil & fit to a modified Wipac E core after sliding the faulty one off & fitting a Ryobi CDI. The following pictures are how it was done. First pics are dismantling the Ryobi coil, the ground conection on the assy was carefully chiseled of the E core. The ground tab will need a lead soldered to it for grounding, disregard the pushon term as its for a stop button (unles you reqire that feature) Also the Wipac center part will need grinding down to 10MM square to fit the CDI coil. These Whipersnippers I pick up from the local scrapman for nothing remove the coils & return the rest to the scrappy, havent found a crook coil yet.

[Daryl]

Next step is to lengthen the HV cable, carefully solder joint fill with neuteral cure silicone & cover with a few layers of heat shrink tubing. Fit to base, the points are nolonger req.

[Daryl]

I have tried this on my FP & it works, But the timing is only about 5deg BTDC, so i shifted the base plate to advance it. The markings are aprox how far it needed to be shifted.

[Daryl]

Wondering if this might be a cheap fix for faulty Wipac CDI units.

[Charles uk]

Daryl that sounds like it's running at the starting timing position, check the polarity of the flywheel magnets, are they the same way around?

[Daryl]

Hi Charles, First 2 pics are where fly wheel is in relation to the white spot when it fires, with Wipac coil & points. Have marked where N & S poles of the magnet are. 2nd pics are where flywheel is when the Ryobi module fires, its a little retarded, so when i ran it I shifted the base plate.

[Daryl]

This is a pic of the Ryobi whipersniper & its ign coil as originaly fited. Dont know what model it is as there is no model on it.

[Charles uk]

Thanks for that Manifold, could you label the polarity of those magnets

[Daryl]

That is the point Pistonbroke, These small motors i suspect are made from one factory & different brand names put on them, as ive seen several brand names & they are all the same engines. Yes they are all throw away @ $100 to $135 Australian, people here throw them out if they dont work. Most get thrown out due to carby problems, $12 carby kit fixes them. Surely there is Scrap places in the UK, or garage sales. I have picked up Seagull motors only suitable for parts from the Scrap man for free. Have people lost the art of scrounging parts & fixing things?

[The Tinker]

Here Here Daryl,
When one restores or rebuild one of the older motors one tends to find as many bits at the smallest cost. I like your thinking with the ryobi parts. Well done. It will be interesting how much spark one of these units can produce.