ATKustom: Rotax

Showing posts with label Rotax. Show all posts

Monday, August 25, 2014

REPAIRS: Rear and Countershaft Sprocket Change

Like any good story begins, I was out on a 100 mile Taco run on a Sunday morning last year minding my own business.

I started feeling some slippage in the hind end and the horrific sound of aluminum being eaten away.

Fewer teeth than a Eureka Tweeker, and that chain doesn't looks so hot either.

A quick call to Lee at ATK and I had a nice bright and shiny, yet slightly orange 48t in my mailbox. He was very in kind in telling me that I had my chain WAAAYYY too tight and the three finger rule is one to abide by and the only thing that could shred a 7075 aluminum sprocket is over tightening the chain. He was right.

Got a gold Regina D.I.D. 520x120 to "match" the talons

That Loctite was exactly that!

My countershaft

The countershaft I wish I had.

After trying to source the countershaft part locally I finally came to my senses and called down to Ron Woods shop and got a replacement 16t within a couple of days.

Of course trying to make sure it is "shouldered" and the splines are correct. Looks decent.

A few different shades of anodized gold FTW!

Took the opportunity while the bike was on the stand to take a look at the CRF brake pads....not so good.

Some EBCs popped in and I'll be doing stoppies in no time.

PART #s

Rear 48t Talon Sprocket 090034 From ATK

Regina D.I.D. 520X120 340582 From Amazon

Rotax 16t Countershaft Sprocket From Ron Woods

COSTS

Rear 48t Talon Sprocket $59.99 + $15 Shipping = $74.99

Regina D.I.D. 520 x 120 $88.44 Free shipping

Rotax 16t Countershaft Sprocket $34.99 + $16.60 Shipping + $2.80 tax = $54.39

Total: $217.82

Tuesday, April 30, 2013

MAINTENANCE: CAM BELT CHANGE VIDEO

Here is a helpful video guide for the Rotax Type 348 Cam Belt Change from a Harley Armstrong MT350:

Here's a step by step Google doc

Thanks to Pantera from the ATK riders forum for the find.

Sunday, April 28, 2013

INFORMATION: ROTAX TYPE 348 SPECIFICATIONS

Wonder how much Horsepower your engine is making? Wonder what the factory compression ratio was? Well, here is some data for the Rotax 348 engine, which looking at my own engine, I should be at 37 horsepower at 7000 rpm with a compression ratio of 9.2. Makes you wonder, what a slight increase in compression would result in performance??? Hmmmmmmmmm....

All information from Peak Riders

MY BIKE

1999 490 DSES purchased used in 2010 with 1500 miles on it.

The only modifications by the previous owners (2) were applying some custom duct tape around the vented mylar decals to keep them from peeling up, some uber custom reflective tape on the swingarms and license plate holder, and a strange circular plastic clip mounted to the top of the headlight assembly for some unknown purpose.

Of course everyone says if you buy an ATK, it already has the best of the best (Brembro brakes, Ohlins / Paoli suspension,Pro-Taper bars, Rotax engine) so don't need to spend a lot of money upgrading it. Well, idle hands are the devil's workshop, and I could only resist the temptation to tinker for so long.