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 Post subject: Rear Long Travel build for GK-13... to match front
PostPosted: Mon Jul 27, 2020 8:08 pm 
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Joined: Tue Mar 20, 2018 1:23 am
Posts: 31
Images: 1
Location: SoCal
So decided the time has come for the rear to float like the front lol. To give a full break down, I got tired of the last 600cc streetbike engine swap snapping the jack shaft. If I let clutch out easily, from a dead stop at least, it would hold up fine but clutch grip slip due to mud or terrain has always been a challenge. Along with the pain of down/up shifting and having to ride the clutch while going up hills has never been enjoyable to me with always having the fear of the jack shaft snapping in the back of my mind. I decided to redesign the jack shaft set up to a more durable design but after one more trip out on 4/20 weekend. That weekend I smoked the FNR gearbox lol. What are the odds... That left me with 2 choices to make, spring 2k for one of the good FNR gearboxes made to handle the power or a complete engine swap to something comparable but with a CVT drive set up to deliver the power more “softly” from a dead stop. 1 month later this 700cc 2 stroke Polaris Indy was sitting in my garage lol. Now this new and hopefully permanent engine set up and installation isn’t going to settle for the stock rear suspension. After building my long travel set up for the front the rear feels even worse while the front is smooth as a sandcar. The plan is to redesign and build the rear suspension, still utilizing dual swing arms w chain drive, prior to engine installation to help with establishing a drive centerline. A separate post will be made down the road to cover the engine swap. The specs of the new rear suspension will be +12” length and +4” width on each side. Estimating 18” of usable travel with 26” dual rate coil overs w bypass. Swingarms will be boxed and trussed, 1/4” plate with inner reinforcement. Pics coming shortly


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 Post subject: Re: Rear Long Travel build for GK-13... to match front
PostPosted: Mon Jul 27, 2020 8:17 pm 
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Joined: Tue Mar 20, 2018 1:23 am
Posts: 31
Images: 1
Location: SoCal
Here’s some pics to get up to speed on where I’m currently at


Attachments:
File comment: Engine already unbolted and lowered, wiring harness removed, cooling system removed, etc..
CAAC5303-CF85-4F4A-B632-0FF7BD6B20DE.jpeg
CAAC5303-CF85-4F4A-B632-0FF7BD6B20DE.jpeg [ 2.66 MiB | Viewed 178 times ]
File comment: Fuel tank, gearbox, swing arms etc removed
1E2A32CC-C593-4EEC-A5F5-BF5D11BF640B.jpeg
1E2A32CC-C593-4EEC-A5F5-BF5D11BF640B.jpeg [ 3.09 MiB | Viewed 178 times ]
File comment: Rear engine cage cut out
5E1BFDB0-A1ED-4431-9D3F-05BF4CDB8111.jpeg
5E1BFDB0-A1ED-4431-9D3F-05BF4CDB8111.jpeg [ 2.7 MiB | Viewed 178 times ]
File comment: New swing arm, incomplete, mocked in mounting position
A7EB7C03-BE03-4BAD-AC5C-4B0C0F4530E1.jpeg
A7EB7C03-BE03-4BAD-AC5C-4B0C0F4530E1.jpeg [ 2.89 MiB | Viewed 178 times ]


Last edited by Saleen27 on Mon Jul 27, 2020 8:34 pm, edited 1 time in total.
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 Post subject: Re: Rear Long Travel build for GK-13... to match front
PostPosted: Mon Jul 27, 2020 8:29 pm 
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Initiated

Joined: Tue Mar 20, 2018 1:23 am
Posts: 31
Images: 1
Location: SoCal
Swing arm fabrication is still incomplete but this gives a pretty good idea to how they’ll look. They will mount with (2) 5/8” heim joints on the wide end and tubing used in the rear for the axle housing.


Attachments:
8175852D-01F1-47C9-96A0-A3C26D8F0B7C.jpeg
8175852D-01F1-47C9-96A0-A3C26D8F0B7C.jpeg [ 2.77 MiB | Viewed 175 times ]
ED47F7F0-775E-4291-90CF-2119B46FE49C.jpeg
ED47F7F0-775E-4291-90CF-2119B46FE49C.jpeg [ 2.87 MiB | Viewed 175 times ]
380BD9C5-1921-47E3-B6DA-5EC0D09CDD82.jpeg
380BD9C5-1921-47E3-B6DA-5EC0D09CDD82.jpeg [ 2.37 MiB | Viewed 175 times ]
File comment: Originally was going to go 8” over on swingarm length but ended up doing 12” lol
E43A87F6-D60A-4F3A-B9F6-57DA4F701DF2.jpeg
E43A87F6-D60A-4F3A-B9F6-57DA4F701DF2.jpeg [ 3.15 MiB | Viewed 175 times ]
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 Post subject: Re: Rear Long Travel build for GK-13... to match front
PostPosted: Mon Jul 27, 2020 8:32 pm 
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Initiated

Joined: Tue Mar 20, 2018 1:23 am
Posts: 31
Images: 1
Location: SoCal
Pic of the new power plant


Attachments:
7A18CB87-9447-488D-AD53-8C2A5B8CA079.jpeg
7A18CB87-9447-488D-AD53-8C2A5B8CA079.jpeg [ 3.87 MiB | Viewed 174 times ]
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 Post subject: Re: Rear Long Travel build for GK-13... to match front
PostPosted: Tue Jul 28, 2020 5:19 pm 
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Joined: Thu Feb 20, 2014 11:29 am
Posts: 525
Location: Alexandria, LA
I'm following this post. I have a similar project.

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Roketa GK-13(Down for the count)
Hammerhead stingray 250 single speed (stock)


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 Post subject: Re: Rear Long Travel build for GK-13... to match front
PostPosted: Wed Jul 29, 2020 8:37 pm 
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Joined: Thu Feb 20, 2014 11:29 am
Posts: 525
Location: Alexandria, LA
How much does your power plant weigh?
How would you fix the front end and steering?

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Roketa GK-13(Down for the count)
Hammerhead stingray 250 single speed (stock)


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 Post subject: Re: Rear Long Travel build for GK-13... to match front
PostPosted: Thu Jul 30, 2020 9:37 am 
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Joined: Thu Apr 21, 2011 1:44 pm
Posts: 2563
Location: Lubbock, TX
I want to see what you did the front. This thing already handles like a boat...adding 8" to the wheelbase is going to make it handle like a larger boat haha

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Roketa GK-34 EFI four seater...see what's up with her here!

Roketa GK13 Sold :(
Gen 5 VFR800 engine swap
Chopped roll cage


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 Post subject: Re: Rear Long Travel build for GK-13... to match front
PostPosted: Thu Jul 30, 2020 12:47 pm 
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Initiated

Joined: Tue Mar 20, 2018 1:23 am
Posts: 31
Images: 1
Location: SoCal
I already did the long travel in the front. You can see it in my other threads/ posts. The new engine should only weigh about half of the streetbike engine due to having no gearbox/ trans and less actual material on the engine. And believe it or not, the front steering isn’t bad. I mean it’s still wide but no where near as bad as I thought it would be


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