Husaberg
Go Back   Husaberg Forum > Mechanical and Technical > Mechanical

Mechanical Mechanical Forum - spinning bits and gyrating bobs


Thanks Tree2Thanks
Reply
 
LinkBack Thread Tools Display Modes
August 13th, 2019, 11:57 PM   #31
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 15,755
Thanks: 459

I Ride: Husaberg FE501e 2003
you know a cam has a bump (lobe) right?

well the valve clearance is only there for when the rocker isn't on the bump - that means when it is going around 'the bottom'. this is called the 'base circle'.

the rocker arm can rock and just be slightly off the cam at one end or just off the tip of the valve at the other.

so if you were the end of the rocker arm your face would be like a fag-papers width away from a spinning cam.

now, let's just say that there is bump on the exhaust base circle and this lobe that with a biff....maybe you have sleeping policemen over there in USAland or road calming humps?

now if you have a big valve clearance because you think it is clever then the rocker will miss that bump as the gap leaves the rocker further away than the bump can reach.

if you don't get the bump, you don't get the decomp benefit; because the bump opens the exhaust valves and lets a fair bit of gas out and makes the compressable amount of mixture less in volume....meaning easier to compress.

so being "kind" to your engine and having a big exhaust valve clearance does the opposite of being 'kind'. it means the starter now faces full compression of all the gases inside. oh-phuqin-dear!

so always stick to the manufacturers recommended valve clearance - especially on the exhaust side.

Taffy
Attached Thumbnails
First Valve adjustment best way to get tdc??-clog-bent-spring-close.jpg   First Valve adjustment best way to get tdc??-modern-decomp-fitted.jpg  

Last edited by Taffy; August 14th, 2019 at 12:03 AM.
Taffy is offline  
 
August 14th, 2019, 06:23 AM   #32
Member
 
Joined: Jun 2019
From: Alameda, CA

Posts: 92
Thanks: 12

I Ride: FE570,FS570,450/520XCF SM, SV1000, NC700
He's in Canuckistan they're called speed bumps here, not sure if they use the same term
Junkie is offline  
August 14th, 2019, 10:34 AM   #33
Member
 
Joined: Jul 2019
From: Ontario

Posts: 43
Thanks: 1

I Ride: 97 KTM SX 250 2 stroke and 04 husaberg 450fe
Should the valve clearance be set a 0.10mm or 0.12mm ? On the wiki page of this site where it says how to adjust the valves it says to make sure the clearance is at 0.10mm and I also read in other places to set them at 0.12 mm anyone know what one is right ? I ordered 3 sets of feeler gauges and none of them have 0.12mm I only have 0.10mm I was thinking the clearance gets bigger as they wear out right ?? So is that why it say to set at 0.10mm and then they wouldn’t need to be adjusted untill the gap was bigger then 0.12mm ? Is that correct ?
Chrisfe450canadian is offline  
August 14th, 2019, 11:10 AM   #34
Member
 
Joined: Jun 2019
From: Alameda, CA

Posts: 92
Thanks: 12

I Ride: FE570,FS570,450/520XCF SM, SV1000, NC700
I don't know Husabergs well enough to say but on most bikes, valves tighten up over time as there's more wear at the valve seat than there is at the valve stem/rocker.

What's the next size you have above .10mm? In my experience most sets come in .001" increments at that size - I'd expect you to have .0015"/.04mm, .002"/.05mm, .003"/.08mm, .004"/.10mm, .005"/.13mm, .006"/.15mm, and so on.
Junkie is offline  
August 14th, 2019, 03:15 PM   #35
Member
 
Joined: Jul 2019
From: Ontario

Posts: 43
Thanks: 1

I Ride: 97 KTM SX 250 2 stroke and 04 husaberg 450fe
Originally Posted by Junkie View Post
I don't know Husabergs well enough to say but on most bikes, valves tighten up over time as there's more wear at the valve seat than there is at the valve stem/rocker.

What's the next size you have above .10mm? In my experience most sets come in .001" increments at that size - I'd expect you to have .0015"/.04mm, .002"/.05mm, .003"/.08mm, .004"/.10mm, .005"/.13mm, .006"/.15mm, and so on.
I ended up doing the 1/6 method couldnít fit a feeler gauge in really , I just got to put the rad on in the morning and then gonna see how it runs. Hopefully I did it right lol.
Attached Thumbnails
First Valve adjustment best way to get tdc??-image.jpg  
Chrisfe450canadian is offline  
August 14th, 2019, 03:27 PM   #36
Member
 
Joined: Jun 2019
From: Alameda, CA

Posts: 92
Thanks: 12

I Ride: FE570,FS570,450/520XCF SM, SV1000, NC700
That's frustrating.

https://smile.amazon.com/Performance...-no-redirect=1 I think that's what I have, certainly something like that.
Junkie is offline  
August 14th, 2019, 04:24 PM   #37
Member
 
Joined: Jul 2019
From: Ontario

Posts: 43
Thanks: 1

I Ride: 97 KTM SX 250 2 stroke and 04 husaberg 450fe
Originally Posted by Junkie View Post
That's frustrating.

https://smile.amazon.com/Performance...-no-redirect=1 I think that's what I have, certainly something like that.
Ya if any wired sounds Iíll just try again , Iím thinking about ordering the Ktm feeler gauge itís a 0.12mm and comes with another one for adjusting the spark plug gap it was like $69 Canadian kinda pricey for a feeler gauge but I geuss worth it in the long run. Iíve heard good things about the 1/6 turn method and it looked easy enough to do so hopfully it works out for me Iíll post a update tomorrow on how it runs. I just didnít wanna bring it to a shop to do the work $250 just for inspection to see what they were at and then more money per valve that needed adjustments so I didnít go that rout.
Chrisfe450canadian is offline  
August 14th, 2019, 07:20 PM   #38
Member
 
Joined: Jun 2019
From: Alameda, CA

Posts: 92
Thanks: 12

I Ride: FE570,FS570,450/520XCF SM, SV1000, NC700
That's pretty outrageously expensive IMO, even Canadian. I'd go to an auto parts store and make sure the set you're buying has .005"/.013mm

They'd really charge per valve on a screw adjust setup?
Junkie is offline  
August 15th, 2019, 12:37 AM   #39
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 15,755
Thanks: 459

I Ride: Husaberg FE501e 2003
by all means buy them Chris and tell us how you do the valve clearances with a $70 set of feeler gauges!

Taffy
Taffy is offline  
August 15th, 2019, 12:10 PM   #40
Member
 
Joined: Jul 2019
From: Ontario

Posts: 43
Thanks: 1

I Ride: 97 KTM SX 250 2 stroke and 04 husaberg 450fe
Well I got it all together and it started first kick the manual decomposition now works the way it should now and the motor didn’t make any strange sounds so I geuss I got the right tdc I used the 1/6 turn method for adjusting and before I adjusted the valves my engine would get hot very fast and now it seems to be running way cooler.. what’s the warm up time for these bikes I heard if you let them idle long they will over heat fast? Thanks everybody for helping me

Last edited by Chrisfe450canadian; August 15th, 2019 at 12:58 PM.
Chrisfe450canadian is offline  
Reply

  Husaberg Forum > Mechanical and Technical > Mechanical

Tags
450fe, adjustment, tdc, valve



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
450 fe valve adjustment Brooh SuperMoto 0 April 16th, 2016 04:50 AM
First valve adjustment etc Boozer Mechanical 9 October 9th, 2008 09:59 AM
valve adjustment piggd Mechanical 13 August 29th, 2008 08:43 AM
What if? valve adjustment! boheme Mechanical 3 February 28th, 2006 08:53 PM
valve adjustment whosahberg Mechanical 14 January 1st, 2006 08:32 PM


Facebook Twitter Google+ RSS Feed