OZ ATV :: The Australian ATV Forum

[Mart 300r]

Well here she is fellas i got a little bit done to it tonight,I had a spare complete rolling 200x (pretty beat up)but shes a great candidate for this project.
What im doing is transplanting a 2001 cr125 engine into it.This is something ive always wanted to do so i bit the bullet, found a great deal on an engine from the states so i brought it in.
I was abit hesitant to start this thread as itll prob go dead for awhile as my little one is due anyday now so i cant see much shed time but whilst i had a spare hour or so i got this done.I didnt want to change countershaft height in any way so i made a little jig with the 200x engine mounted so i could pull that donk out and line the cr counter shaft straight in the same spot as the x.To many hybrid builds i see over the net where ppl mount the countershaft way to low and it just asks for the chain to saw straight through the swinger lol.In this case itll be exactly where the 200x one was.

Next prob will be the rear mount of the cr has the through engine swinger bolt setup and the 200x swinger slides back and fourth i havent exactly sorted what im going to do here but ill work it out.

Next prob will be the down tube,I may have to build a new section of down tube as the exhaust outlet is dead inline.Altough i have another thought of getting around this ill see how that goes first.

Prob after that is the rear kicker here's where im gunna go all hybrid on it lol Im going to mount a pullstart on it i know itll be weird pullstarting a cr125 but i think itll fit the project perfect.

Well heres the photos let us no what yas think, also ideas on some colours would be good as the guard is actually a orange as it was a maier stuffup back in the day.
Oh and i havent given up on the 250r pipe ive just ran outta gas for the tig and havent got around to gettin another bottle its abit of a scene to organise a bottle so its been pushed aside for awhile.cheers guys.








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1984 ATC 300R, 1986 TRX 500R,1984 ATC 200X, ATC 70 WITH CUSTOM LAYDOWN 250R ENGINE, 125CC CUSTOM THUMPSTER TRIKE

[ForeverThreeWheels]

Great idea on the jig mate, i always wondered how to make one.
Everything looks good. What are you planning on doing for the radiators?
If the pullstart doesnt work maybe this will give you some ideas.

http://www.ebay.com/itm/honda-atc-250r-goki-starter-1983-84-81-82-atc250r-1981-1984-1984-83-/230835933943?pt=Motors_ATV_Parts_Accessories&hash=item35bee4d2f7&vxp=mtr#ht_500wt_1205
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[Mart 300r]

Thanks ben,the pull start should itll be easier to pull over than 70 i reckon lol.I cant wait to get some more done to it ive got some good stuff for this thing(most of its my brothers stuff lol)clarke tank durablue axle etc should be a lttle goer. As for radiators ive got a couple of diferent styles laying around ill just mock up which ones i like best.
I cant believe that goki starter hasnt sold yet not every day ya see em for the r's
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1984 ATC 300R, 1986 TRX 500R,1984 ATC 200X, ATC 70 WITH CUSTOM LAYDOWN 250R ENGINE, 125CC CUSTOM THUMPSTER TRIKE

[ylwgtr]

Yeah I'm amazed nobody bought it...so I did

[Mart 300r]

ylwgtr wrote:

Yeah I'm amazed nobody bought it...so I did

Ya got it mate? "sweet" rare peice right there forsure good stuff,
Well the bub hasnt arrived yet so there might be some more shed time tonight lol.
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1984 ATC 300R, 1986 TRX 500R,1984 ATC 200X, ATC 70 WITH CUSTOM LAYDOWN 250R ENGINE, 125CC CUSTOM THUMPSTER TRIKE

[ForeverThreeWheels]

ylwgtr wrote:

Yeah I'm amazed nobody bought it...so I did

Good stuff.

Fingers crossed for you Mart.
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[slightlydodgy]

will be watching with interest With your down tube could you make a triangle arangement with the base being out near the edges of the bottom frame and your exhaust going through the middle this would also give you something substantial to hang your radiators from
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Tremble with fear - I've had an idea

[Oldrodder]

Have a look at a TPC frame or even a water cooled 250 that might give you some ideas.
The only problems I found in the past with bike engines in trikes was the vibration from the different frame configuration, that is why the Hondas have balance shafts. I had a 250 frame with a CR480 engine in it many years ago and you could only ride it hard for a short period as it sent your hands numb.
The quad in the cage must be savage when you have to keep him in a cage. LOL

[ForeverThreeWheels]

Oldrodder wrote:

Have a look at a TPC frame or even a water cooled 250 that might give you some ideas. The only problems I found in the past with bike engines in trikes was the vibration from the different frame configuration, that is why the Hondas have balance shafts. I had a 250 frame with a CR480 engine in it many years ago and you could only ride it hard for a short period as it sent your hands numb. The quad in the cage must be savage when you have to keep him in a cage. LOL

Pfft. He put a balancer on the 500... this should be a peice of cake... he's probably got 1 knocked up for it already.

I think the 125 shouldnt be too bad.
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[Mart 300r]

Yeh 125 wont vibrate much at all mate.The slug in this thing is only 55mm compared to the 89mm 500,Those bad boys are like a dinnerplate goin up and down lol.

I got alittle more done tonight i decided to make new front frame rails so i had some pipe in the stockpile and bent it up.I decided to try and get alittle fancy and squash the end just like the x frame where they meet the downtube but i ended up wrecking one so i now have to do another oh well thats what ya get.here they are anyway(before i stuffed one lol)


They are i tiny bit crimped but i was only using Jack style pipe bender also using my big dawn vice with just the mandrel in it im pretty happy with how they turned out considering that.
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1984 ATC 300R, 1986 TRX 500R,1984 ATC 200X, ATC 70 WITH CUSTOM LAYDOWN 250R ENGINE, 125CC CUSTOM THUMPSTER TRIKE

[ForeverThreeWheels]

Thats looking great buddy. Are you going to paint this build when finished and pretty it all up when done?
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[Mart 300r]

Yeh deffinately ben just dunno what colour.the guard is a maier colour mismatch so its orange so still trying to think of a colour scheme. Was thinkin black frame with silver swinger etc dunno though.
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1984 ATC 300R, 1986 TRX 500R,1984 ATC 200X, ATC 70 WITH CUSTOM LAYDOWN 250R ENGINE, 125CC CUSTOM THUMPSTER TRIKE

[slightlydodgy]

All orange then call it the "Flying Gumdrop"
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Tremble with fear - I've had an idea

[Mart 300r]

slightlydodgy wrote:

All orange then call it the "Flying Gumdrop"

Lol
After seing ol mates hybrid polaris in quad section im thinkin orange frame with black or silver and chrome mmmmmmm dunno gotta build it first. Completion date im aiming for next aus day.
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1984 ATC 300R, 1986 TRX 500R,1984 ATC 200X, ATC 70 WITH CUSTOM LAYDOWN 250R ENGINE, 125CC CUSTOM THUMPSTER TRIKE

[HaggLE]

Be inspired by the first atc70

[slightlydodgy]

I see among the essential tools on your bench you have an ACDC cd but your only going 125???
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Tremble with fear - I've had an idea

[HaggLE]

He likes his trikes like him, light and nimble...

See, I didn't mention the colour...

[Mart 300r]

Should see what i build when i get my country music on
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1984 ATC 300R, 1986 TRX 500R,1984 ATC 200X, ATC 70 WITH CUSTOM LAYDOWN 250R ENGINE, 125CC CUSTOM THUMPSTER TRIKE

[ForeverThreeWheels]

Mart 300r wrote:

Should see what i build when i get my country music on

Ive seen it!


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[Mart 300r]

Haha gold ben,
Well got abit more done tonight bent up new frame rail cut a peice of frame out and sectioned it into position.I also turned up a peice of rod to dowel the join at the bottom.Heres a few more pics







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1984 ATC 300R, 1986 TRX 500R,1984 ATC 200X, ATC 70 WITH CUSTOM LAYDOWN 250R ENGINE, 125CC CUSTOM THUMPSTER TRIKE

[ylwgtr]

looking good mart!

[ForeverThreeWheels]

Incredible.
What type of welder did you use?
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[Mart 300r]

Stick mate,
Real boilys use stick welders mate.cough cough (or ones that cant afford a mig for there shed lol)
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1984 ATC 300R, 1986 TRX 500R,1984 ATC 200X, ATC 70 WITH CUSTOM LAYDOWN 250R ENGINE, 125CC CUSTOM THUMPSTER TRIKE

Last edited by Mart 300r on Wed Aug 15, 2012 6:26 pm; edited 1 time in total

[slightlydodgy]

Was thinking of your project when I put the grizz away tonight and had a quick look at mine (250 honda clone 4 stroke into a yz250 2 stroke frame) to see the next step and discoved that when I cut the front frame and redesigned the bottom pan that I forgot about the header (currently off) I think you have just shown me the solution I will watch with interest although I won't be doing anything for a while coz we are in the middle of calving (12 hour days pretty normal at the mo)
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Tremble with fear - I've had an idea

[Mart 300r]

Calving ay. I should be calving soon to hope it goes quicker than 12 hours lol. I think i pretty much called my wife a cow??
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1984 ATC 300R, 1986 TRX 500R,1984 ATC 200X, ATC 70 WITH CUSTOM LAYDOWN 250R ENGINE, 125CC CUSTOM THUMPSTER TRIKE