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Gear Reductions Discuss and post information on gear reductions.

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post #11 of 24 (permalink) Old 07-09-2018, 08:01 PM
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Fish, the ex gears in the 450 make a 35% Reduction. I would take your primary and the ex gear and let the machinist make them up. All he needs to do is make sure it’s the same length as the factory gear.
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post #12 of 24 (permalink) Old 07-10-2018, 12:56 AM Thread Starter
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I would also second LBZ’s comment, get a machine shop to do the primary. You’ll need a decent sized lathe, big enough to get zero flex and a diamond tipped tool. The only other way would be to fab a mount for the tool post to attach a die grinder but then you get sparks over the lathe bed. Diamond tips don’t come in cheap either, £160 for one when I looked, cheaper to get it machined. The basket is easy.
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post #13 of 24 (permalink) Old 07-10-2018, 01:46 AM
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Thanks for the info , hope my machine shop friend can pull it off -------- if he says he can't then I will mail it off to get done ---- the basket and gear are on the way thanks to LBZ , and thanks to WheelSquad would bought some parts that paid for it

I need to start looking for a good set of clutch disc to handle the 35% and 29.5's Outlaws ---- what do you think about the clutch
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post #14 of 24 (permalink) Old 07-10-2018, 03:02 AM Thread Starter
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If he’s got a shop he’ll manage it I’m sure, it’s the size of the machinery needed that limits you really. You need a robust lathe.
I’d use EBC clutches and springs, the stock centri will handle the tyre size and reduction but fit new OEM springs or HD from EBC. The HD flick out HARD and make a noise, I’ll try and get a video before I take the GR out the 300.

98 300 Fourtrax 4x4

Custom built mud bike - Now sold.

2004 Foreman 450S

Fully overhauled (nut & bolt rebuild), 2” lift kit, 28” mega mayhems, ITP delta rims, ES floorboards, 22” LED lightbar, Pyle Bluetooth sound system.
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post #15 of 24 (permalink) Old 07-10-2018, 03:24 AM
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try to follow me on this one , I put the 15.5% in my 2002 , but I can't remember what Dick's did , I gave him a 300 gear and basket , when it was finished he gave me back a gear and basket , I am sure that basket is a 450 , I wonder what that gear is ----- so what I am asking is

??? on a 15.5% you would not use the 450 stock gear or would it have to have been cut ????

or maybe he gave me back the 300 gear , not sure what gear I got at the moment , I need to dig up that set tomorrow -------- worst case I would have to take a spare engine apart --- you never know I might ride this green 450 this weekend

It is nice to be able to come to this site and get info
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post #16 of 24 (permalink) Old 07-10-2018, 04:25 AM Thread Starter
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15.5 would be 300 basket and primary gears. What you had back are 450 gears.

98 300 Fourtrax 4x4

Custom built mud bike - Now sold.

2004 Foreman 450S

Fully overhauled (nut & bolt rebuild), 2” lift kit, 28” mega mayhems, ITP delta rims, ES floorboards, 22” LED lightbar, Pyle Bluetooth sound system.
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post #17 of 24 (permalink) Old 07-10-2018, 07:32 AM
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Quote:
Originally Posted by fishfiles View Post
try to follow me on this one , I put the 15.5% in my 2002 , but I can't remember what Dick's did , I gave him a 300 gear and basket , when it was finished he gave me back a gear and basket , I am sure that basket is a 450 , I wonder what that gear is ----- so what I am asking is

??? on a 15.5% you would not use the 450 stock gear or would it have to have been cut ????

or maybe he gave me back the 300 gear , not sure what gear I got at the moment , I need to dig up that set tomorrow -------- worst case I would have to take a spare engine apart --- you never know I might ride this green 450 this weekend

It is nice to be able to come to this site and get info
All the 15.5 reduction is on a foreman is a stock fourtrax300 basket, no modifications at all.

2016 Honda Pioneer 1000-5 Deluxe White
30" Outback Max on 14" C-Series Beadlocks
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2008 Honda Rancher 420 4x4
Money Pit......soon to be greatness

1998 Honda Trx300 4x4
317 motor, 54% Gear Reduction, EBC Clutches, Big Red Rear End, 2.75" Stretch, 350D Clutch Cover, Oil Cooler, Foreman 450 Clutch, Disc Brake Kit, 29.5 OG Laws

1985 Honda Big Red 250 ATC
18% Reduction, 28" EDL

Sold
19 - Honda Trx300 4x4
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post #18 of 24 (permalink) Old 07-10-2018, 01:58 PM Thread Starter
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Fancy a big GR for a 300 Fish? This will do it nicely ;-)

https://rover.ebay.com/rover/0/0/0?m...2F263804935380

98 300 Fourtrax 4x4

Custom built mud bike - Now sold.

2004 Foreman 450S

Fully overhauled (nut & bolt rebuild), 2” lift kit, 28” mega mayhems, ITP delta rims, ES floorboards, 22” LED lightbar, Pyle Bluetooth sound system.
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post #19 of 24 (permalink) Old 07-12-2018, 07:51 PM
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Reduction Calculation??

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Originally Posted by SamUK View Post
Calaculation is, primary reduction x first gear ratio x secondary reduction x final drive ratio
I don't think the formula in #10 post by SamUK at this forum is correct. It seems logical to me that the series of reduction ratios involved should be simply added together to get overall ratio -- not multiplied as he has posted. Thus my 300ex with primary reduction of 2.833, 5th gear reduction of 1.178, and final chain drive reduction of 2.923 (13 teeth to 38 teeth) should end up at 6.923 overall not the 9.7548 as obtained by multiplying the reductions involved. I don't want to have to run my engine at 8000 rpm to barely hit 40MPH -- anyone agree??

And while we are at it, what is max safe engine RPM on a MY2000 Honda 300ex?? I have posted this question before but never got a response.
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post #20 of 24 (permalink) Old 07-12-2018, 08:25 PM
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I think having a sub section for GR's is a great Idea
would also like to see a sub section for SUNK ATV"S too LOL

heck they might go hand in hand here too LOL
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