Yesterday's Tractor Co. Shop Now
   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
Classified Ads
Photo Ads
Tractor Parts

Discussion Forums
Project Journals
Tractor Town
Your Stories
Show & Pull Guide
Events Calendar
Hauling Schedule

Tractor Photos
Implement Photos
Vintage Photos
Help Identify
Parts & Pieces
Stuck & Troubled
Vintage Ads
Community Album
Photo Ad Archives

Research & Info
Tractor Registry
Tip of the Day
Safety Cartoons
Tractor Values
Serial Numbers
Tune-Up Guide
Paint Codes
List Prices
Production Nbrs
Tune-Up Specs
Torque Values
3-Point Specs

Tractor Games
Just For Kids
Virtual Show
Museum Guide
Memorial Page
Feedback Form

Yesterday's Tractors Facebook Page

Related Sites
Tractor Shed
Ford 8N/9N Club
Today's Tractors
Garden Tractors
Classic Trucks
Kountry Life
Tool Talk Discussion Forum

Re: GX390?

[Show Entire Topic]  

Welcome Guest, Log in or Register
Author  [Modern View]
Billy Shafer

10-16-2012 07:57:34

Report to Moderator

Almost forgot. Valves

Intake 0.15 MM
Exhaust 0.20 MM

[Log in to Reply]   [No Email]
George Marsh

10-16-2012 10:09:46

Report to Moderator
 Re: GX390? in reply to Billy Shafer, 10-16-2012 07:57:34  
Billy, thanks for the info.

Bought pressure washer used. It has no hour meter. As for compression, YES, that's what makes so hard to start. Sometimes it fires too early and pulls the starter out of my hand.

Going to check valve clearance and put a thinner oil in it.


[Log in to Reply]  [No Email]
Billy Shafer

10-16-2012 15:21:47

Report to Moderator
 Re: GX390? in reply to George Marsh, 10-16-2012 10:09:46  
George. Those are cold settings. The cam lobe controls compression release. No other way that I know of. Briggs has the same system.I should have the 390 manual somewhere around my nice clean office.I will check.

[Log in to Reply]  [No Email]
George Marsh

10-16-2012 19:36:47

Report to Moderator
 Re: GX390? in reply to Billy Shafer, 10-16-2012 15:21:47  
I adjusted the valves when cold. Exhaust was only about .002 in out. I did notice the exhaust valve opening a little on the compression stroke? Does the cam do that? Are there 2 lobs on the cam?

[Log in to Reply]  [No Email]

10-17-2012 03:33:23

Report to Moderator
 Re: GX390? in reply to George Marsh, 10-16-2012 19:36:47  
The cam has a weight that is on a lever. That lever turns a small shaft that has an eccentric on the end of it. That eccentric sticks out into the exhaust lobe of the crankshaft. The weight it held one way with a spring. So at low speeds the eccentric will open the exhaust valve a little at crank speeds. When the engine hits and comes up to running speed the weight over comes the spring pressure. Then the eccentric is flush with the cam lobe and no longer hits the exhaust valve.

Have you tried a new spark plug. I have a JD pressure washer that has a Honda motor on it. If it starts hard it usually is the spark plug not firing right under compression. Also are you able to crank it good and fast??? As my Dad has gotten older he can't pull the rope fast enought for small engines to start correctly. He complains about this one or that one not starting correctly. Me or my sons can just give it a good yank and the engine starts fine.

I have actually mounted a few snow blower motors on some of the things he uses with a small gas engine on them. The snow blower motors have 110 volt electric start on them. So he can just plug in the cord and hit the button and away he goes.

One of his motors was the same model as one used on snow blowers. I was able to change the flywheel to one that would use the electric starter.

[Log in to Reply]  [No Email]
George Marsh

10-17-2012 04:35:03

Report to Moderator
 Re: GX390? in reply to JDseller, 10-17-2012 03:33:23  
I'm looking for a flywheel and starter. I think my problem is I'm getting old. 3 days later my arm and sholder is still hurting from pulling on the starter.

May buy myself a new pressure washer with a starter for Christmas.

My 6.5 briggs on a pressure washer is a dream to start, but the gismo that adds soap and bleach is broken. It's built into the pump. I would have to buy a new pump to fix the problem. I need to do something, still have 3 properties to clean.


[Log in to Reply]  [No Email]
[Show Entire Topic]     [Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:

Fast Shipping!  Most of our stocked parts ship within 24 hours (M-Th). Expedited shipping available, just call! Most prices for parts and manuals are below our competitors. Compare our super low shipping rates! We have the parts you need to repair your tractor. We are a company you can trust and have generous return policies. Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ About Us ]

Home  |  Forums

Copyright © 1997-2018 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters