dbw - dirtbikeworld.net Members Forums

Go Back   dbw - dirtbikeworld.net Members Forums > The Workshop > Tech Talk

Tech Talk Proudly Sponsored by Mainjet Motorcycles

Reply
 
Thread Tools Display Modes
  #11  
Old 29-03-2018
daddyrat daddyrat is offline
dbw Pro
 
Join Date: Feb 2016
Location: upper Blue Mountains
Posts: 430
[QUOTE=Tom68;2035282]You're not doing much right there, got a workshop manual ?

I know, hence the post.
I was trusting the mechanic. He has 20 years of experience, runs a shop, so I thought I was in good hands.
Would wear have a glazing effect on the barrel? And does this mineral oil versus synthetic oilhave any merit? I thought synthetic is the bees knees, nothing better!
Reply With Quote
  #12  
Old 29-03-2018
daddyrat daddyrat is offline
dbw Pro
 
Join Date: Feb 2016
Location: upper Blue Mountains
Posts: 430
Why I discounted wear so far is because the engine has only 180hrs Max.
Reply With Quote
  #13  
Old 29-03-2018
Elton's Avatar
Elton Elton is offline
dbw Pro Champion
 
Join Date: Aug 2005
Location: sunny Coast
Posts: 3,779
what sort of bike are we talking ?
__________________
whatever
Reply With Quote
  #14  
Old 29-03-2018
Pygmygod's Avatar
Pygmygod Pygmygod is offline
dbw Factory Pro
 
Join Date: Jul 2013
Location: Sunbury
Posts: 759
Sandpaper on the bore sounds scary...

No honing stones?

What did the ends of your valves look like?
Worn real thin? Does it start fine?

What does the coolant look like?

Where else can the oil go?
Do you have a bash plate? Take it off and see if there's oil between it & engine?
__________________
2005 WR250F
Reply With Quote
  #15  
Old 30-03-2018
hairyone's Avatar
hairyone hairyone is offline
dbw Pro Champion
 
Join Date: Apr 2004
Location: Canberra
Posts: 3,676
I'm a Motor Mechanic.. & I'm 50 years old... So I guess that gives me 25 years experience?
You shouldn't treat a Nikasil bore like a tube of iron: It's a hard lesson to learn but you will.

Edit: I dumped Mechanic Trade 3 years after finishing my Apprenticeship: Yet it's still valid.
Edit2: I'm a wise up to you daddyrat.. Father wanta be.. maybe one day... I wish you well.
__________________
The More I Learn... The Less I Know.
That Which Doesn't Change... Stays The Same.
Those That Don't Fall... Just Aren't Trying Hard Enough.
Genius or Idiot... Sadly it's Defined by the Mediocre Masses... With their Hindsight.
Dicklaimer... The Text above is to be Evaluated by a Responsible Person... Prior to Any Action Being Taken.

*George Carlin*What We Do*No Bravery*Tell the Truth*911*Genetic Armageddon*Carbon Tax*Interplanetary Climate Change*Fracking*Shock Doctrine*Extinction Protocol*
Reply With Quote
  #16  
Old 30-03-2018
daddyrat daddyrat is offline
dbw Pro
 
Join Date: Feb 2016
Location: upper Blue Mountains
Posts: 430
Quote:
Originally Posted by Pygmygod View Post
Sandpaper on the bore sounds scary...

No honing stones?

What did the ends of your valves look like?
Worn real thin? Does it start fine?

What does the coolant look like?

Where else can the oil go?
Do you have a bash plate? Take it off and see if there's oil between it & engine?
I agree, sandpaper does sound scary but that's how he does it!
Valves looked good, seats had the required width and were reground. Inlet valves are clean as a whistle outlet is filthy as due to the burned oil. It starts first go every time and idles fine.
I did take the bash plate off and there is no trace of oil.
Maybe the rings are directional, as in having a upside and a down side?
Reply With Quote
  #17  
Old 30-03-2018
daddyrat daddyrat is offline
dbw Pro
 
Join Date: Feb 2016
Location: upper Blue Mountains
Posts: 430
Edit2: I'm a wise up to you daddyrat.. Father wanta be.. maybe one day... I wish you well.[/QUOTE]

??
Reply With Quote
  #18  
Old 30-03-2018
380EXCQLD 380EXCQLD is offline
DBW Clubman
 
Join Date: Aug 2017
Location: Fraser Coast
Posts: 178
Quote:
Originally Posted by daddyrat View Post
Maybe the rings are directional, as in having a upside and a down side?
Many of them are.
Might be wise to try a new set, but you also need to measure the piston clearance with something more accurate than your mates eye! ...like a micrometer and bore-gauge.

You've said it's a 4T, but what exactly. I'm pretty sure most modern high performance thumpers would be due for a piston at/before 150hrs.

Quote:
I was trusting the mechanic.
This could be where it all went wrong. Is he familiar with the type of engine you're dealing with. There's a lot of mechanics out there, who are little more than service technicians.
Quote:
The mechanic thinks the glazing is due to the synthetic oil which also caused the excessive use of oil.
Bad mechanics are experts at making excuses for their fkups.
Reply With Quote
  #19  
Old 30-03-2018
Bushmechanic's Avatar
Bushmechanic Bushmechanic is offline
dbw Pro Legend
 
Join Date: May 2008
Location: WA
Posts: 2,914
150 hours plus smoke. Blame air filter maintenance?
__________________
2008 Husaberg 700F, Ohlins RXF forks, Ohlins TTX shock, cut n chopped frame, 8 paddle rear with bolts, big michy mousse, 104kg all fuids no fuel

frame build http://www.husaberg.org/forum/viewtopic.ph...php?f=8&t=13268
Engine http://www.husaberg.org/forum/viewtopic.ph...php?f=5&t=12131

Update http://www.dirtbikeworld.net/forum/s....php?p=1679488
Reply With Quote
  #20  
Old 30-03-2018
daddyrat daddyrat is offline
dbw Pro
 
Join Date: Feb 2016
Location: upper Blue Mountains
Posts: 430
Quote:
Originally Posted by Elton View Post
what sort of bike are we talking ?
2015 beta rr390
Reply With Quote
Reply

Thread Tools
Display Modes

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Fully Synthetic to synthetic oil dionalessi General Bike Related Discussion 3 29-04-2013 01:57 PM
2t Engine Tuning - MOTA Software? >moto< Tech Talk 18 24-02-2012 06:09 PM
Fully Synthetic vs Semi Synthetic 2 Stroke Oils Hydro General Bike Related Discussion 11 14-08-2009 08:48 AM
Ever mixed 2T gearbox oil (semi synthetic with fully synthetic)? big orse General Bike Related Discussion 11 04-02-2008 10:12 PM
Synthetic or Semi-synthetic groeneweg Tech Talk 5 10-03-2003 11:58 AM


All times are GMT +11. The time now is 01:34 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2018, vBulletin Solutions, Inc.