HPI Baja 5B pinion bolt.

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Old 08-15-2012, 11:11 AM
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Default HPI Baja 5B pinion bolt.

I was driving my 5B and the tires stopped turning. I took apart the gears, and saw that the pinion bolt was split in half! I ordered the parts, but has anyone else had this problem, or know how to prevent it?
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Old 08-15-2012, 04:10 PM
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Originally Posted by TMistak View Post
I was driving my 5B and the tires stopped turning. I took apart the gears, and saw that the pinion bolt was split in half! I ordered the parts, but has anyone else had this problem, or know how to prevent it?
Yep! common issue with the baja line. Drill and tap out your clutchbell to the next larger bolt size. Or, upgrade to a turtle hd clutch and be done with it. there have been used setups around for $80-$90 in near new condition.
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Old 08-15-2012, 08:39 PM
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You can buy a 12.9 rated bolt that is available at DDM. It can still bust but not as easily as the stock bolt. The pinion bolt issue is definitely a known issue with the Baja.

I have the Turtle HD clutch on my Baja and I haven't ran into any problems since. Its pricey though.
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Old 08-16-2012, 12:47 PM
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Same thing happened with me, I just bought the replacement part and I havent ran into the problem again.

Hope fully I wont need to upgrade, 80-90$ is alot for a pinion.
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Old 08-17-2012, 11:52 AM
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if you use a tiny drill bit try drilling into the screw as dead center as possible and threading out the broken screw. That's how I got mine out.

I have had it happen once in 3 years so I guess I am doing well (knock on wood).
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Old 08-17-2012, 11:58 AM
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A much easier way is too reverse the bolt and run it through the back of the clutchbell with loctite on it and the put you pinion on and double nut it and it wont snap of or anything.
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