Introduction and my 85 ATC250R complete rebuild for trail/MX

[loshe191]

Looking awesome keep up the good work!

[Math]

Thanks Guys!

Update will come slowly since the warm weather finally arrived and the motocross tracks are now re-open. I will keep you updated of any progress I will make but I will have less time to put on my project this summer than I had during winter


Anyway, here's the stock rims powder coated gloss black. The tires are Kenda Klaw 20x11-9 in the back and Kenda Front Max 23x8-11 in the front. In tried the Klaw in the past and really liked how easy it was to drift the rear end of the quad so it should be ideal for a trike




The rear axle was a little rusted so I painted it with a brass color to look like the Zinc plating it came with. It came out too gold I think but for the moment it will go like this

[86125m]

The paint really does hold up well just remember to put lots of clear coat on it. Your bike is looking good as well

[Math]

The rear sproket before and after.


I drilled the aluminium rivets that were holding the sproket guard




With fresh powder coat

[Math]

With the axle ready to be mounted, I was able to complete the rear suspension and put it back on it's wheels

To remove it from my work table I hooked the ATC on the ceiling


Then dropped the rear


Installed new bearings and bolted the hub in the front wheel


Front wheel, forks and brakes all bolted


Making progress

[Red Rider]

Looking real good Math! Keep us all posted with the updates.

[KDXRon]

Awesome. Good stuff.


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[KDXRon]

I've ran those kenda claw tires in the rear. They are good for breaking loose on corners. Great job on the build.


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[keister]

Good updates, nice trike!!
This is going to look like a new machine when you get done with it.

[Fox250R]

Umm did you need to add spacers for your progressive springs ?

[Math]

Made some progress again!

The engine was working really well except for little clutch drag and the traditionnal exhaust leakage. The previous owner ad this trike from 1987/88 to 2015 and he never touched the engine. To his knowledge, the first owner never touched this engine also. Looking at the piston from the exhaust port I saw that there wasn't major wear so I tought: let's ride it until it brake. Just to see how many more years this engine could do!


The engine paint was pelling off everywhere so I sandblasted the engine




Then painted it to look like the 1986 engine color. I think the engine bay look brighter with the grey color then all black






Then I opened the clutch cover to inspect the clutch. No surprise here: the basket needed to be file










Completed

[Math]

Engine back in the frame




Also, I cleaned and sandblasted the exhaust pipe and found several hole in it!




My brother welded the smallest holes but wasn't able to weld the bigger one as the metal mas to thin. I used a Permatex ciment made for exhaust holes. I don't really trust these kind of stuff so I will check if it hold up or if I need a new pipe. Sorry no pics

The pipe and exhaust painted


I also installed an ESR billet exhaust flange which looks the be great quality. I hope it will stop the exhaust leakage

[yaegerb]

Nice work mart! Always enjoy seeing your progress. Yes, that ehs flange is bullet proof.

[Math]

So I finaly took the time to finish my project and even ride it a couple of times!

Almost finished




Little test run in the back yard just to make sure everuthing was fine


Then loaded the 2R and the bikes for an MX track that accept both the ATV's and bike's


Me and my brother having a blast on the track. There was a lot of ATV racers at that track and it was quite fun to have them look at us on the track. Like they had no clue why we were beating this old trike on the track and having more fun on it then on our modern dirtbike








My friend testing the balance


I was used to modified TRX250R in the past and with this stock engine it was kind of a surprise how low in power it actually is! The torque is almost inexistant and the power seems to fall flat with little overrev. You always have to be on the right gear with a finger on the clutch lever. Makes a world of difference compare to my KTM 450 but it's probably what make this trike so much fun.

[yaegerb]

What oil ratio are you running?