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HJR type tranny mod


SlowMoe

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From what I understand, you pull some of the gears off and remove every other cog from inside the gear. I was thinking it may be possible for someone wthout a machine shop... My question is what gears come off, what gears do you grind on, are there any special tools required and is this all the job entails.

 

Thanks!

 

Oh and also would this be a worthwhile mod on a 75 hp bike or would there need to be a full override for it to shift.

 

Thanks!

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i did mine with a die grinder and a drill press. pull the transmission apart and if it has 6 dogs, remove every other one.

 

 

 

profit.

 

Can you please elaborate on this?

How many gears do you grind total? I'm having a hard time visualizing how you use a die drinder and a drill press...

 

What mods do you have and does it shift noticeably better?

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sheerider1026 has some really good pics.

 

2 of the gears have 6 external engagement dogs and 2 of them have 6 internal ones. the external ones you just take and cut every other one off so you only have 3 left. the internal dogs are a bit harder. i used a drill press and sharp bit to remove most of the material and cleaned it up with a die grinder. sheerider did his with a dremel.

 

just spinning it over by had it goes into gear noticeably easier as mine doesnt run yet. sheerider said his shifted awesome.

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ahh!! i just did this mod to mine.. wroks great.. i used 3 different tools to make the cuts needed... as far as shifting.. its sooooo much better.. i would never put a banshee together without doing this... here are a few pictures to show you whats going on... if u would like i can cut a tranny for ya.. do it pretty dam cheap too.. just pm me.. here ya go

2011-01-10_19-34-44_560.jpg2010-12-20_16-35-53_152.jpg

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ahh!! i just did this mod to mine.. wroks great.. i used 3 different tools to make the cuts needed... as far as shifting.. its sooooo much better.. i would never put a banshee together without doing this... here are a few pictures to show you whats going on... if u would like i can cut a tranny for ya.. do it pretty dam cheap too.. just pm me.. here ya go

2011-01-10_19-34-44_560.jpg2010-12-20_16-35-53_152.jpg

Ok in the second pic I am guessing the second gear above your hand is one with external dogs and you grinded them already? It's kinda hard to see..

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Ok in the second pic I am guessing the second gear above your hand is one with external dogs and you grinded them already? It's kinda hard to see..

 

Yep, that's correct. The gears are hardened so keep that in mind if you want to do it yourself. Make sure you keep them cool as you cut/grind on them. Most professional shops that do this will use carbide bits in an end-mill and a rotary table, and will do the cutting with coolant/lubricant flowing onto the gear while its being cut.

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