Go Back   ATVConnection.com ATV Enthusiast Community » Brand Discussions Area » Honda
Sign in using an external account
Register Forgot Password?
Search

Welcome to ATVConnection Forums!
Welcome to ATVConnection.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the ATVConnection Forums community today!


Reply Share this with your friends
  #1  
Old 07-15-2006, 02:28 PM
Weekend Warrior
Garage is empty, add now
 
Join Date: Jul 2006
Posts: 4
Default 400ex without compression release on cam

Hi, just wondering is anyone has tried to run the engine with the compression release removed from the cam to avoid the noise associated with it. Is it an option or might there be balance issues?
Reply With Quote
  #2  
Old 07-15-2006, 03:10 PM
Weekend Warrior
Garage is empty, add now
 
Join Date: Jul 2006
Posts: 4
Default 400ex without compression release on cam

me again, I was wondering if this has been tried before, I couldn't find it in the search. My son is complaining about the noise and says he's loosing compression due to the release not working properly. He's planning on pressing off the gear and removing all the components of the release then press the gear back on. I'm sure someone has thought of this before, and maybe tried it, I'd like to hear from someone who has possibly tried or heard of this before, and if it's fesible. Thanks
Reply With Quote
  #3  
Old 07-17-2006, 01:17 PM
Weekend Warrior
Garage is empty, add now
 
Join Date: Jul 2006
Posts: 4
Default 400ex without compression release on cam

Well thought I'd say that my son removed the decompression mechanism from the stock cam without any problems. He had replaced the piston last month with an 11/1 ratio and had around 150pds of compression. After removing the decompresor from the camshaft now he's got constant 210pds compression and it runs great. It took care of the noise and also increased compression by 60 pounds.
I was a little worried about the high compression (possible) oil leaks, but he's broken it in and all appears fine. I'd would have thought this much compression would cause starting problems with the electiric start but no, it cranks even quicker than before, in about a half second or so. There is no difference as far as a balance issue, smooth as silk and the bike runs like a spotted ape. The only minor problems was air flow, we drilled 1/4" holes in the top cover of the air filter box, about 50 of them. Drew lines and spaced them out in a grid and they look factory. It helped tremendously.

Just wanted to let anyone know how it came out in case you were thinking of this mod.

Reply With Quote
  #4  
Old 07-18-2006, 12:02 PM
Trailblazer
Garage is empty, add now
 
Join Date: Jul 2004
Posts: 100
Default 400ex without compression release on cam

I took mine out the last time I rebuilt my 400EX and have no problems

DWT
Reply With Quote
  #5  
Old 07-18-2006, 07:51 PM
Pro Rider
Garage is empty, add now
 
Join Date: Aug 2002
Posts: 2,132
Default 400ex without compression release on cam

It is important to note the compression readings you are getting are faulted. The higher compresion is only becausse it is not releasing and allowing the motor to spin easy...more comp takes more juice to start...you don't have any more compression with the mechanism released at running RPM...all you have done is make the starter motor work harder(60lbs harder)

As for the noise its important to bring your motor up to tdc the correct way and not let the motor move in the opposite direction AT ALL. This is usually cause of the noise. Good luck guys
Reply With Quote
  #6  
Old 07-18-2006, 10:27 PM
Pro Rider
Garage is empty, add now
 
Join Date: Jul 2000
Posts: 1,155
Default 400ex without compression release on cam

i don't understand why it is causing noise but it should run fine without the decompressor on it.
Reply With Quote
  #7  
Old 07-19-2006, 10:21 PM
Weekend Warrior
Garage is empty, add now
 
Join Date: Jul 2006
Posts: 4
Default 400ex without compression release on cam


Quote:
It is important to note the compression readings you are getting are faulted. The higher compresion is only becausse it is not releasing and allowing the motor to spin easy...more comp takes more juice to start...you don't have any more compression with the mechanism released at running RPM...all you have done is make the starter motor work harder(60lbs harder)


I don't understand, you say the readings are faulted? I thought the decompressor simply released some compression at low RPMs for starts, however how can it release compression with no decompressor? If it spins over and shows 210lbs now, what's going to "release" the compression after it cranks? That doesn't really make any sense to me.

Reply With Quote
Old 07-19-2006, 10:21 PM
Reply Share this with your friends

Tags
06, 2000, 400ex, cam, compression, decompression, decompressor, hona, honda, leaking, mechanism, oil, release, remove, removing, trx400ex



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On