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View Full Version : Picked up a 1984 atc200es Big red, butt loads of compression?


408Fairmont
12-24-2013, 11:28 AM
Hi everyone, my brother and I just picked up another ATC so we can ride together, it was cheap so it has the normal problems like no brakes and no front fender, etc... Its a bit of a Mutt because it has an X front end, he said from the same year. Got it running, has ton of compression but thats what I am wondering about, it friggin wants to rip your arm off. Its like it backfires or something and yanks back. I am going to check the timing to see if the cam skipped a tooth or something, just wondering if they normally are hard to pull over when new? The engine is clean and looks like it has been either really well taken care of, or worked on recently. Maybe its recently rebuilt? or maybe has an X piston too?


Sorry no pics yet, I have the wheels all off and its a bit tucked away, after christmas is over Ill have some more time to look at it, and then it will be easier to get some shots of it.


Thanks

Xander
tripledog
12-24-2013, 11:36 AM
Not trying to insult you, but are you aware that there is a compression release lever on your 200ES? It is located on the right side (as seated) on the front of the cylinder head. Pulling the lever up greatly assists in pull starting the 200ES. Hope this helps.
408Fairmont
12-24-2013, 11:59 AM
Not trying to insult you, but are you aware that there is a compression release lever on your 200ES? It is located on the right side (as seated) on the front of the cylinder head. Pulling the lever up greatly assists in pull starting the 200ES. Hope this helps.

Yea I know about that, and it does help. Theres just such a difference between the two trikes it seems weird:wondering

Basically I guess I should stick the compression tester on the pair of them and see what I get.
rg97
12-24-2013, 01:12 PM
If it has had work recently, they may have put a 12:1 piston in, which on a pull start is heck to turn over. Look down in the spark plug hole at TDC, and if you see a piston that is smooth on top, its a stock compression and something else is wrong. If the piston looks highly domed, then it has a high compression piston, most of the time either 10.25:1 or 12:1, up from stock 8.5:1. If you plan on eventually ripping it apart, pull the head and take a picture of the piston
Yamada
12-24-2013, 01:40 PM
Check the valve clearance.