« previous next »
Pages: [1]   Go Down

Author Topic: Engine compression  (Read 4604 times)

0 Members and 1 Guest are viewing this topic.

Offline Hillger

  • Jr. Member
  • **
  • Posts: 14
Engine compression
« on: March 21, 2014, 12:57:39 PM »
I have an 89 kx500 the bike has compression, I know I need to test it but I am unsure of what the compression it is suppose to be and if there are any tips anyone can give me on the best way of  testing it?
Logged

Offline sandblaster

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 8,271
    • OEM-CYCLE QUALITY USED PARTS
Re: Engine compression
« Reply #1 on: March 21, 2014, 02:29:04 PM »
Compression gauge.
Unscrew the spark plug, screw in the gauge, open the throttle wide open, (Make sure your air filter is clean) and kick it like you want to really ride it bad.
Tell us where it is at  :-D
Logged
The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline Hillger

  • Jr. Member
  • **
  • Posts: 14
Re: Engine compression
« Reply #2 on: March 21, 2014, 02:35:26 PM »
Well Alrighty sounds easy enough thanks for the input and I'll let you know sometime tomorrow
Logged

Offline Hillger

  • Jr. Member
  • **
  • Posts: 14
Re: Engine compression
« Reply #3 on: March 23, 2014, 12:32:16 PM »
Well I have gotten the compression keep in mind it was on a cold engine considering I need a carb to get the engine warm the psi was 30 I have a bad feeling I need to do a top end:/
Logged

Offline Foxx4Beaver

  • Hero Member
  • *****
  • Posts: 8,952
  • James Stewart DID NOT invent the scrub!!..JoJo
Re: Engine compression
« Reply #4 on: March 23, 2014, 12:36:56 PM »
the book says the useable range is 105psi-164psi....but that's on a fully warmed up motor...I'm willing to bet you'll know if it needs a top-end the second you pull the head/cylinder :wink:

keep in mind that's based on a stock engine.
« Last Edit: March 23, 2014, 12:41:08 PM by Foxx4Beaver »
Logged
Excuse me, ma'am...but you've got extremely nice legs!!!...what time do they open???                                                                                                               https://www.youtube.com/watch?v=n8tCgN3aryQ

Offline Hillger

  • Jr. Member
  • **
  • Posts: 14
Re: Engine compression
« Reply #5 on: March 23, 2014, 12:41:55 PM »
I pulled the head not the cylinder I  kicked the engine with my had was difficult so I know there's  compression I looked over the cylinder didn't see any scoring but I am also not a professional by any means in learning as I go.
Logged

Offline Foxx4Beaver

  • Hero Member
  • *****
  • Posts: 8,952
  • James Stewart DID NOT invent the scrub!!..JoJo
Re: Engine compression
« Reply #6 on: March 23, 2014, 12:46:22 PM »
post some pics of the cylinder plating, showing the intake and exhaust sides if ya can...pics are always good.
Logged
Excuse me, ma'am...but you've got extremely nice legs!!!...what time do they open???                                                                                                               https://www.youtube.com/watch?v=n8tCgN3aryQ

Offline Hillger

  • Jr. Member
  • **
  • Posts: 14
Re: Engine compression
« Reply #7 on: March 23, 2014, 01:27:00 PM »
Okay I will do that tomorrow
Logged

Offline Hillger

  • Jr. Member
  • **
  • Posts: 14
Re: Engine compression
« Reply #8 on: March 23, 2014, 01:30:55 PM »
The exhaust side typically looks a bit more worn right??
Logged

Offline sandblaster

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 8,271
    • OEM-CYCLE QUALITY USED PARTS
Re: Engine compression
« Reply #9 on: March 23, 2014, 01:36:11 PM »
Yep.. Typically.... but not always   :wink:
« Last Edit: March 23, 2014, 01:38:24 PM by sandblaster »
Logged
The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline Foxx4Beaver

  • Hero Member
  • *****
  • Posts: 8,952
  • James Stewart DID NOT invent the scrub!!..JoJo
Re: Engine compression
« Reply #10 on: March 23, 2014, 01:36:28 PM »
not necessarily...ever seen the inside of a cylinder where the owner never cleaned the filter?? :-o

are you seeing something to make you ask that question?
Logged
Excuse me, ma'am...but you've got extremely nice legs!!!...what time do they open???                                                                                                               https://www.youtube.com/watch?v=n8tCgN3aryQ

Offline Hillger

  • Jr. Member
  • **
  • Posts: 14
Re: Engine compression
« Reply #11 on: March 23, 2014, 01:39:19 PM »
No sir just curios just things I've heard from others wanted to verify if it was true or not.
Logged
Pages: [1]   Go Up
« previous next »