4020 gas can get more power?

Posted by buickanddeere on March 07, 2006 at 05:52:49 from (209.240.120.39):

In Reply to: My 4020 gas can get more power? posted by Deeretrax on March 06, 2006 at 18:43:01:

If she isn't making 97HP on the dyno then there is something wrong with it. What is it making now?
1st thing to do is to toss the resistor core plug wires and spark plugs. Use solid wires and Autolite 3116 plugs gapped at 40 thou. Install an electronic Pertronics points replacement set and thier matching six volt coil. No more points to cause trouble.
Odds are either the bypass starting circuit has failed, somebody used a 12v coil with a ballast resisitor or the coil polarity is reversed.
The only carb that ever worked on any gas JD is a Zenith, Marvel carbs just don't. And they have to set up correctly on a dyno to find the leanest idel and main mixture that doesn't loose significant power.
The thermostat has to work and be a 195F unit. The aircleaner has to be clean and the case not collasped from being over tighened.
The choke may appear open but the linkage is often out of adjustment. Pull the hose off the carb inlet and be certain it's 100% open.
If the manifold heat adjustment will move, crank it over to hot.
Of course these tuneups will do ziltch if the compression is low or the cam is worn out.

Replies:

Add a Reply Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]