Messages

1

ATC250R / Sons newly acquired 1985 atc250r

« on: April 04, 2016, 09:35:30 AM »

Thanks, broken one, will check it out. a.f.g.

2

ATC250R / Sons newly acquired 1985 atc250r

« on: April 03, 2016, 07:25:42 PM »

A.f.g. here, well, as it usually goes, time to spend $. It tossed the bottom end. Sorta figured it would. Lotsa trash went through it on previous top end failure. Piston pin clips came out with standard results. We flushed and hoped. Epic fail. So, bottom end time. Who has best deals on crank kits? I've done the rod thing on other less popular bikes, but usually ends up costing the same or more than a kit. Any suggestions? Thanks, a.f.g.

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ATC250R / Sons newly acquired 1985 atc250r

« on: March 27, 2016, 11:55:08 AM »

Well thank you all for the info! As for pics, while I can usually fix anything with a piston (s) I'm a computer bozo. So, if I can peel one of my sons off of one of several two strokes or three wheelers that reside here, I'll get pics of all of em!

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ATC250R / Sons newly acquired 1985 atc250r

« on: March 15, 2016, 08:35:03 PM »

Hello all. Guess I needed to move this thread here. Son just bought a very nice mothballed 85atc250r. After going over it and installing new jug, head, piston, we got it running. And WOW is this thing FAST! First worry I have is temps. After 10-15 min of hard running (is there any other kind?) 50° or so ambient temperature, head/cylinder is195° radiator top tanks is 175° lower tanks 145° water pump 175°. What is normal range for this three wheeled rocket? Although why it has three wheels is beyond me. As the front one only seems to be for parking! Worrying about when temps are in the 100s! Lotsa work to overhaul! (Dad's job).

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Introductions / Sons newly acquired 1985 atc250r

« on: March 15, 2016, 12:53:42 PM »

O ya, it burbles a bit at top of power band. Trying to determine if rich or lean. Main jet needle is on lowest (leanest) setting. We're at 5,900 ft elevation. Don't know what's been done before with the jetting. Need a starting point.

6

Introductions / Sons newly acquired 1985 atc250r

« on: March 15, 2016, 12:45:46 PM »

Thanks to all. My first concern is temperature of various components after a hard run
 (The only kind it gets apparently)! Ambient temperature was low 50s/ upper 40s f. At "pit stop" head/cylinder temps were 195° top radiator tanks 175° lower tanks 125° water pump 175°. All this according to my whiz-bang cheepo laser thermometer. This seemed a bit high to me. I'm thinking ahead to summer temps of high 90s/low100s thoughts anyone? Thanks, a.f.g.

7

Introductions / Sons newly acquired 1985 atc250r

« on: March 14, 2016, 12:20:09 AM »

Hello from north central Arizona! We live off grid on a huge ranch area that has been subdivided somewhat. I'm a 56yo disabled retired truck driver. My wife and I have 1 daughter (25) and 2 sons (19 and 20.) I've been a passionate dirt freak most of my life. My first dirt bike was a 5horse b&s mini bike. 6th grade. I've had a few since then. A Honda trail 50 was next, then a stripped down Honda 160 scrambler, then bought a Yamaha DT 125. Stripped it down, got a 175 jug and piston, chamber and forward mounted shocks. Man, that was top shelf stuff then! In 1976, I bought the first Yamaha yz250 to show up at the local Yamaha shop. Was the fastest thing on the planet! Had many cool dirt bikes since then, but due to a work accident in 2013, I no longer ride. So it fell to my sons. They started in the mid 00s the same way. We now have several cool toys. Since I don't ride anymore, I am the guy that fixes it. We have several teenagers around "the hood" with bikes, quads, ect. My 20yo son just purchased a very clean 1985 atc250r was mothballed for 10 years. We did the top end thing, piston, jug, head. Carb and fuel tank cleaning, ect. I need to talk to others about this rocket ship on 3 wheels so, I joined this site. Looking forward to rapping with you folks!