HPI Ignitions performance?

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5/9/2018 10:41 AM

Wrapping up the chassis and starting the engine on my ‘89 YZ125 build. I’ve got a buddy who was involved in the race team during this period, and according to him, the stock ignitions systems on this gen YZ125 were a contributing factor to their anemic peformance. The factory teal solved it by adapting RM125 ignitions to their race bikes back then. Point being, there are good gains to be made with ignition. I’ve settled on either, adapting a newer gen YZ ignition(which I’m assuming will require some serious fab work), or going with an HPI ignition. So my question is, anyone have any experience with them? Are they good performing systems? Better than stock?

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5/9/2018 11:45 AM

I am using them on a couple of bikes and have found them well made and perform well . A bit of a head scratch to install and set up but once you have done one they are easy

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5/9/2018 2:17 PM
Edited Date/Time: 5/9/2018 2:20 PM

I've ridden two ahrma nationals on my '79 YZ125 with a new HPI system, and the performance is outstanding. I bought my bike a couple weeks before the series started and didn't even ride the bike enough with the OEM ignition to make a comparison before swapping everything out for the HPI. The OEM seemed ok at the time, but my concern was not performance as much as reliability, since I had several people tell me that "it's not if, but when the OEM ignition will cost you a race".

Oops, I just realized yours is an '89, not '79, but I'll keep this posted for what it's worth - it works great on my bike.

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5/10/2018 8:08 PM

I was looking at them too for a 1986 CR125 but was concerned about the rotor being internal instead of the stock external as far as inertia, flywheel affect goes, IE more or less torque etc.

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5/10/2018 10:04 PM

Thanks for the input so far everyone! Smed- I had the same thought too. I'm not convinced yet.

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5/12/2018 1:59 PM

Smed wrote:

I was looking at them too for a 1986 CR125 but was concerned about the rotor being internal instead of the stock external as ...more

I believe they sell flywheel weights as well

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