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HJR 510 motor build issues, please help


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 I think I would consider swapping to a big bore pipe. The CPI’s were definitely keeping it hot as they’re pretty much past their capabilities at 500CC, let alone a ported super cub. 
The switch to Shearers will help, but after riding for a while in the dunes I bet you’re still fighting heat. They will be sweet for short rides and dyno runs, but a race gas motor with timing over 500cc is gonna be much happier with a big bore pipe for longer rides. 

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I will pay more attention to my temp next time I go out. I didn't really go on any long day rides last time but it seemed to be holding up ok at night. I might have to bite the bullet and switch to big bore if it starts heating up. Do you know how it will effect the power in the motor?

My lights went out went out at the hill on the trip so I had to ride back without lights. I wasn't able to find any broken wires, maybe the stator went out? I was thinking about doing the DC conversion so that I can install some LED head lights and maybe a light bar, but heard mixed reviews on them.

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Stator failure could be the cause of some of your problems. Buy OEM.

DC conversion with JL Engineering battery pack is a nice upgrade, don’t exceed 70 watts.

someone in the wanted section was looking to trade big bore shearers for small bore, I’d jump at it if they’re still available 

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  • 2 months later...
  • 9 months later...

I ended up converting my gas to E85 and got it tuned. I haven't taken it out yet, but I can already tell it is a night and day difference from what it was before. I told the tuner I just wanted a safe and conservative tune, it dynoed at 112 HP. I have some big bore pipes on the way, it should free up a couple more hp and help keep the engine cooler as suggested by trickedcarbine. 

Turns out my stator was ok, it might be my light/kill switch. He helped me hook up a Milwaukee battery to small light bar in the front, and I will try to replace the switch to see if that will fix my problem with my headlights

Edited by kevshiau
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HJR could t get you tuned correctly?
Why switch fuels? Who did the tune? Where the dyno located?, been wanting to dyno one of my bikes.

8 rear rims in my opinion are way better. The tens look nice, but don’t work as well for me.


Sent from my iPhone using Tapatalk

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I took it down to HJR 4-5 times and he couldn’t get it right. It’s a 2 hour drive for me to San Diego and I was just tired of taking it down to him. Motor ran like shit and was not happy or impressed with it at all

I switch because e85 is wayyy cheaper than 110 and it keeps my motor cooler. I got my bike tuned and dynoed with Mike at so cal racing

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