Big Gun (big bore)#1

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6/28/2013 4:40 PM
Edited Date/Time: 6/29/2013 7:44 AM

All caught up on projects, closed the shop until fall

Working on the final timing specs, front fork settings, oil
Weight , volume

Has anyone purchased an Ohlins shock, with a short hose
Resevoir set-up from a reputable dealer that works on the
RM465-500

Suzuki RM465 - pumped up to just under 540cc
Out for some testing at the remote Arkansaw mx track
In Wisconsin , modern style track(supercross size jumps).

The track in empty
Photo

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6/28/2013 6:27 PM

Nice looking bike.
Given that power was never lacking on big bore 2 strokes, why the overachiever displacement?

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6/29/2013 7:56 AM

I have built 3 engines for this bike, with Suzuki parts hard to find

Yamaha YZ465-490 con- rods fit the suzuki crank halves.
And then you have plenty of replacement options , pistons
Etc

Big Cat pistons, rods will also work. -(Artic Cat)

Southern flatlanders most likely have never been on a truly fast
200 hp 2 stroke sled!

Have you ever been to Hay Days?

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6/30/2013 9:17 AM

Never heard of Hay Days.

Do the YZ con rods fit the RM400 crank? I had a 80' RM400 in high school and at some point want to pick up another one. I've read that finding pistons is difficult at best; wondering if your rod trick might be the solution.

The only sled I've been on was some rental POS in the early 80's. A 200hp model sounds like it would provide stupid levels of fun!

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6/30/2013 11:16 AM

Did you rebuild the stock shock? I had Sage Suspension do mine and it works great. I put Race Tech springs in the forks and fill them to six inches below the top with forks collapsed and springs out. I'm happy with it.

When I rebuilt mine last year I called my Suzuki dealer for another part and mentioned the lack of availability for a connecting rod. The parts guy looked it up in the computer and told me there was a rod in stock at a dealership in Idaho Falls. I called them up and it was in my mailbox two days later. Got the last one I guess. I used a Wossner Maico 490 piston in mine.

What was done to the top in to get to 540cc's?

Ed

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7/2/2013 10:09 AM
Edited Date/Time: 7/2/2013 10:19 AM

Yes, the stock suspension has been completey
Rebuit, new fork bushings, Race tech gold valves
The forks work really well, just setting up different
Preload spacer lengths, I machined up spacers starting
From .5 inches in length up to 2.25 using YZ465 new springs.
Can swap out in minutes per track

Rear rebuilt with stock set- up spring, arms
Have been remachined using Al-Ni-Brnz
It works better than my new Honda, Yamaha I
Have for comparison

I just would like to find someone who has a
Contact with an Ohlins supplier.


The 465 engines I have a completly rebuilt
Top to bottom, new Suzuki rods, all internal
Bearings, even a new clutch basket In the one!

Mac suzuki had 2 rod kits on the shelf, I had
The clutch basket in a few days.

I have enough parts to build 2 more bikes.

The Yamaha rod has the same pin sizes, but
Is 5mm plus in length, c to c or more if i remeber.
Also the 1000 cc twin rods from a cat work.
It gets pretty involved from here. Rebore out the
Crank halves to accept a larger pin etc,,,,,

A guy from australia bought all my spare swap
Over parts for the conversion, I guess that was
2 years ago now

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7/2/2013 10:24 AM

RM400 rods? I am sure you could retro fit
Something similiar

But you have to do the legwork

Look at the Wieseco main data base for
Bore and stroke info

For all mfg 2 strokes, buy up a few used
Engines and dissasemble and see what
You find?

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7/4/2013 9:44 AM

Just contact Jerry at Ohlins (Jerry Wohlgemuth [jerry.wohlgemuth@ohlinsusa.com]). He has been very helpful on my Honda stuff.

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8/17/2016 4:24 AM

Any sources for lower bearings? I need to overhaul my crank and am looking for parts.

Can get an YZ490 rod kit easily, but how much of that kit can I use?

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11/13/2020 12:43 PM

rob.boucher.547 wrote:

Yes, the stock suspension has been completey
Rebuit, new fork bushings, Race tech gold valves
The forks work really well, just setting up different
Preload spacer lengths, I machined up spacers starting
From .5 inches in length up to 2.25 using YZ465 new springs.
Can swap out in minutes per track

Rear rebuilt with stock set- up spring, arms
Have been remachined using Al-Ni-Brnz
It works better than my new Honda, Yamaha I
Have for comparison

I just would like to find someone who has a
Contact with an Ohlins supplier.


The 465 engines I have a completly rebuilt
Top to bottom, new Suzuki rods, all internal
Bearings, even a new clutch basket In the one!

Mac suzuki had 2 rod kits on the shelf, I had
The clutch basket in a few days.

I have enough parts to build 2 more bikes.

The Yamaha rod has the same pin sizes, but
Is 5mm plus in length, c to c or more if i remeber.
Also the 1000 cc twin rods from a cat work.
It gets pretty involved from here. Rebore out the
Crank halves to accept a larger pin etc,,,,,

A guy from australia bought all my spare swap
Over parts for the conversion, I guess that was
2 years ago now

Resurrecting an old thread....I had a question on the YZ 465-490 connecting rod. If the rod fits aside from being 5mm longer, could this be utilized along with a 5mm spacer under the jug?

Micah

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11/13/2020 8:03 PM

Those are cool bikes. Rob really made his nice.

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11/14/2020 4:03 PM

rob.boucher.547 wrote:

Yes, the stock suspension has been completey
Rebuit, new fork bushings, Race tech gold valves
The forks work really well, just setting up different
Preload spacer lengths, I machined up spacers starting
From .5 inches in length up to 2.25 using YZ465 new springs.
Can swap out in minutes per track

Rear rebuilt with stock set- up spring, arms
Have been remachined using Al-Ni-Brnz
It works better than my new Honda, Yamaha I
Have for comparison

I just would like to find someone who has a
Contact with an Ohlins supplier.


The 465 engines I have a completly rebuilt
Top to bottom, new Suzuki rods, all internal
Bearings, even a new clutch basket In the one!

Mac suzuki had 2 rod kits on the shelf, I had
The clutch basket in a few days.

I have enough parts to build 2 more bikes.

The Yamaha rod has the same pin sizes, but
Is 5mm plus in length, c to c or more if i remeber.
Also the 1000 cc twin rods from a cat work.
It gets pretty involved from here. Rebore out the
Crank halves to accept a larger pin etc,,,,,

A guy from australia bought all my spare swap
Over parts for the conversion, I guess that was
2 years ago now

Micahdogg wrote:

Resurrecting an old thread....I had a question on the YZ 465-490 connecting rod. If the rod fits aside from being 5mm longer, could this be utilized along with a 5mm spacer under the jug?

Micah

In general, yes it works
But you might consider it will increase crankcase volume, maby its a benefit?
If you find a piston with 5mm lower compression hight(from pin to top of piston) you will keep volume the same as before

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