Skip to content
View in the app

A better way to browse. Learn more.

Trials Central

A full-screen app on your home screen with push notifications, badges and more.

To install this app on iOS and iPadOS
  1. Tap the Share icon in Safari
  2. Scroll the menu and tap Add to Home Screen.
  3. Tap Add in the top-right corner.
To install this app on Android
  1. Tap the 3-dot menu (⋮) in the top-right corner of the browser.
  2. Tap Add to Home screen or Install app.
  3. Confirm by tapping Install.

Engine Oil Vent 4Rt Modification

Featured Replies

Hello to all,
I would like to simplify the oil breather tube system of my Montesa 4rt.
There is currently a pipe from the engine rises towards the headstock and arrives in a white box, from which depart two tubes: one is a drain, and one goes to the throttle body.
I want to delete everything, and bring the engine vent directly down, mounting a small filter to protect against impurities.
It can be done ?
Thank you

post-22408-0-96928500-1458648704_thumb.jpg

Finish the breather under the head stock. 

Put white bottle in the bin

Block the hole going into the air box

Don't think I would take the pipe where you have indicated small filter is good idea.

 

You can then take the relay of the bracket under the air box and fit it behind the headstock where the white tank came from

 

  • Author

Well tnks.

Is there also any function in the original pipes system other than the environmental recovery of oil  ? For example any "lubrification" of the intake system of throttle body, etc...

In other hands: any disadvantage about this modification ?

Tnks

Not aware of any benefits - all 3 of mine have had this mod - been on 4rt nearly 10yrs.

I wouldn't put it there, the Yamaha wr enduros had them there and if they cut out in water it would get drawn back up into the engine as it cooled

  • Author

Tnks again, so pls where is better to put the vent pipe ( red line in my pic ) ? In the Beta enduro after modification usually the vent go up near fuel tank and go down near the base plate. Can I do the same ?

This is an interesting question.

I was looking at the same thing on my bike recently.

 

What is the white plastic "bottle" for?

Does it serve any purpose?

 

  • Author

I suppose that bottle is for condensate oil separation, just for environmental oil recovery....

  • 2 years later...
On 3/22/2016 at 5:54 PM, jimmyl said:

Not aware of any benefits - all 3 of mine have had this mod - been on 4rt nearly 10yrs.

Hi Jimmy. Do you have a filter on either of the head breather pipe or the transmission breather pipe? I'm currently rebuilding my 2005 4rt and noticed the strage tank is missing and both pipes were just up at the headstock above the radiator.

I just fit an in line fuel filter to stop and dirt getting sucked in

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

Account

Navigation

Search

Search

Configure browser push notifications

Chrome (Android)
  1. Tap the lock icon next to the address bar.
  2. Tap Permissions → Notifications.
  3. Adjust your preference.
Chrome (Desktop)
  1. Click the padlock icon in the address bar.
  2. Select Site settings.
  3. Find Notifications and adjust your preference.