Removing Powervalve
- Arj256
- Site Supporter
- Reactions:
- Posts: 28
- Joined: 04 Aug 2012, 23:39
- Bike Owned: Mk2 CRM 250
- Location: Portsmouth
Removing Powervalve
Would like to remove my power valve for cleaning up and inspection, as its removed when its re bored to have material taken off as far as I'm aware.
Looking at the diagram of it, it only appears to be held in by the clip and bolt under the cover? And once removed you should be able to pull the shaft out and the power valve can be removed? On a Mk2.
Mines not budging so just checking i haven't missed anything?
Looking at the diagram of it, it only appears to be held in by the clip and bolt under the cover? And once removed you should be able to pull the shaft out and the power valve can be removed? On a Mk2.
Mines not budging so just checking i haven't missed anything?
- knackeredMk1
- Super Moderator
- Reactions:
- Posts: 4185
- Joined: 03 Nov 2006, 17:41
- Bike Owned: Modified Mk1
Re: Removing Powervalve
Once you remove the bolt holding the retaining clip it should just pull out.
- Arj256
- Site Supporter
- Reactions:
- Posts: 28
- Joined: 04 Aug 2012, 23:39
- Bike Owned: Mk2 CRM 250
- Location: Portsmouth
Re: Removing Powervalve
Cheers for that, was hesitant if it was suitable for a little bit of force.
Had to make up a slide hammer for it and even that didn't work, meaning a few gentle taps of the hammer broke the build up of carbon to allow it to remove.
Its out now:

Had to make up a slide hammer for it and even that didn't work, meaning a few gentle taps of the hammer broke the build up of carbon to allow it to remove.
Its out now:

- fishtail
- Site Supporter
- Reactions:
- Posts: 1048
- Joined: 13 Jan 2012, 11:29
- Bike Owned: CRM 250 Mk3
- Location: derby/leicester border.
Re: Removing Powervalve
is it 100% necessary to remove for rebore?
I think i will make sure I do on my next one - but sort of curious for opinions.....
I think i will make sure I do on my next one - but sort of curious for opinions.....
1996 CRM 250 "Mk 3" FMF pipe .... - the other 'un is a 98 hornet 600 - Sai Kung Hong Kong
- knackeredMk1
- Super Moderator
- Reactions:
- Posts: 4185
- Joined: 03 Nov 2006, 17:41
- Bike Owned: Modified Mk1
Re: Removing Powervalve
The PV needs to be in when the cylinder is rebored as it needs to be cut away or it will hit the new piston.
- fishtail
- Site Supporter
- Reactions:
- Posts: 1048
- Joined: 13 Jan 2012, 11:29
- Bike Owned: CRM 250 Mk3
- Location: derby/leicester border.
Re: Removing Powervalve
i think they just dremmelled mine in position,, cos I had to take it back cos when I fitted the piston the first time it did catch I bit as i slowly turned the engine over...
1996 CRM 250 "Mk 3" FMF pipe .... - the other 'un is a 98 hornet 600 - Sai Kung Hong Kong
- helisupp
- NWAA Supporter
- Reactions:
- Posts: 744
- Joined: 12 Apr 2012, 21:57
- Bike Owned: CRM AR (4)
- Location: Gloucester
Re: Removing Powervalve
Fishtail,
Looking at the bore of your bike, it looks like they dremmeled the rebore as well, or maybe it was filed oversize by hand on Reclamation Street.
Looking at the bore of your bike, it looks like they dremmeled the rebore as well, or maybe it was filed oversize by hand on Reclamation Street.
-
- NWAA Supporter
- Reactions:
- Posts: 3520
- Joined: 02 Dec 2007, 16:02
- Bike Owned: MK3
- Location: Mid Surrey
Re: Removing Powervalve
helisupp wrote:Fishtail,
Looking at the bore of your bike, it looks like they dremmeled the rebore as well, or maybe it was filed oversize by hand on Reclamation Street.




Mike
VFORCE REEDS-MUGEN HEAD AND BARREL-WHITE POWER-ALL ON MY WISH LIST!!
- fishtail
- Site Supporter
- Reactions:
- Posts: 1048
- Joined: 13 Jan 2012, 11:29
- Bike Owned: CRM 250 Mk3
- Location: derby/leicester border.
Re: Removing Powervalve
funny you mention gangnam style mike - cos when ever I think of you I sort of visualize mike from spaced, you know ? the weapons expert? always got a gun in his pocket?
but he does do a few dances now you mention it...
http://www.youtube.com/watch?v=txh3O66hzBo
- mike is 20 sec in - actually I was searching for the episode where he does aerobics but didnt find it - that would have been soooooooooo much more suitable
but he does do a few dances now you mention it...
http://www.youtube.com/watch?v=txh3O66hzBo
- mike is 20 sec in - actually I was searching for the episode where he does aerobics but didnt find it - that would have been soooooooooo much more suitable

1996 CRM 250 "Mk 3" FMF pipe .... - the other 'un is a 98 hornet 600 - Sai Kung Hong Kong
-
- NWAA Supporter
- Reactions:
- Posts: 3520
- Joined: 02 Dec 2007, 16:02
- Bike Owned: MK3
- Location: Mid Surrey
Re: Removing Powervalve


Mike
VFORCE REEDS-MUGEN HEAD AND BARREL-WHITE POWER-ALL ON MY WISH LIST!!