motocross mt.

Show us what you're working on (MT or very very closelyy related subjects only please).
Red
Posts: 93
Joined: Fri Jan 08, 2016 6:19 am
Location: suffolk

Re: motocross mt.

Post by Red » Mon May 09, 2016 3:24 pm

Sounds like a good day all round. Doing mx once a week should have the fitness covered! Result in the front ends being good from the off
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hwbuilder
Posts: 61
Joined: Sun Oct 11, 2015 5:24 pm
Location: east yorkshire

Re: motocross mt.

Post by hwbuilder » Tue May 10, 2016 8:15 am

I thought the forks would do the trick. Even though 33yr old parts , yz490 forks were about the best available then.
If the fox shocks sort the rear end, I will be needing more power (I've already got ccm604 engine to transplant) .
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hwbuilder
Posts: 61
Joined: Sun Oct 11, 2015 5:24 pm
Location: east yorkshire

Re: motocross mt.

Post by hwbuilder » Mon May 16, 2016 9:47 am

Well I've survived my 2nd motocross !
28yrs since I last rode (I was 14stone and 30yrs old then)
Put on a few stone and a few years since then.
We had a mad rush the day before to improve rear suspension ! Chopped off shock mounts and moved forward on swing arm and fitted fox air shocks. They still need a tweek or two, but so much better , the track had a lot of jumps and woops to contend with.
So once the aches and pains ease I will continue practising and make improvements to the brilliant MT.
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hwbuilder
Posts: 61
Joined: Sun Oct 11, 2015 5:24 pm
Location: east yorkshire

Re: motocross mt.

Post by hwbuilder » Mon May 16, 2016 9:49 am

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A before and after picture !
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hwbuilder
Posts: 61
Joined: Sun Oct 11, 2015 5:24 pm
Location: east yorkshire

Re: motocross mt.

Post by hwbuilder » Mon Mar 27, 2017 3:11 pm

Update! 604 rebuild/mods.
We are making good progress with the motocross mt's.
New racing season about to start, I've had engine out , stripped it down to just crankcase and internals.
Then popped down to see Gary at sportax (5hr journey)
had a chat and cuppa while Gary split crankcase , removed balance shafts and fitted new main bearings.
Engine back together and in frame again ready for test this weekend. While engine out I've fitted new oil seals etc and mt cases ( kicker 604 now). And have cured difficult starting by fitting mt 665 cam. Starts almost first kick hot or cold and ticks over .
Now starting on the next stage to make bike lighter !
I've just got a spare frame and it's getting all lugs chopped off. Modified subframe to take ktm 495 fuel tank and seat, and alloy swinging arm and ktm rear wheel.
I will post pictures as it develops.
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hwbuilder
Posts: 61
Joined: Sun Oct 11, 2015 5:24 pm
Location: east yorkshire

Re: motocross mt.

Post by hwbuilder » Thu Aug 03, 2017 9:15 am

I've finally got round to start modify frame as I've been out of action with a broken leg ! . I'm not fully fit , but can get back in garage.
I will post pictures later today.
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hwbuilder
Posts: 61
Joined: Sun Oct 11, 2015 5:24 pm
Location: east yorkshire

Re: motocross mt.

Post by hwbuilder » Thu Aug 03, 2017 5:06 pm

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hwbuilder
Posts: 61
Joined: Sun Oct 11, 2015 5:24 pm
Location: east yorkshire

Re: motocross mt.

Post by hwbuilder » Mon Sep 11, 2017 11:31 am

The mt motocross project has been put on hold while I do another project.
I've been meaning to start this ages ago. It's a armstrong cmx ( single shock evo) .
I'm going to use it for twinshock racing , so I've altered back end for twin shocks. It did have steel swing arm , but I'm fitting 604 ccm arm. As with my current mt motocross it's having yamaha yz490 forks , wheel and brake.
I'm using my mt500 bottom end ,with motocross head and 670 cam. Ive also machined every other fin off barrel like ccm did on the works C25 motocross bikes .After talking to Gary at sportax I'm going get some machined of base of barrel to raise compression. Then 604 ccm front pipe and short reverse cone mega. I'm making progress , but along way to go. Will try and add pics as I go.
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hwbuilder
Posts: 61
Joined: Sun Oct 11, 2015 5:24 pm
Location: east yorkshire

Re: motocross mt.

Post by hwbuilder » Mon Sep 11, 2017 11:39 am

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hwbuilder
Posts: 61
Joined: Sun Oct 11, 2015 5:24 pm
Location: east yorkshire

Re: motocross mt.

Post by hwbuilder » Mon Sep 11, 2017 11:39 am

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