Cr125 Powervalve

[morg_nz]

210582

This may kind of overlap my previous post but what is everyones opinion as to the purpose of the 5.5mm pin as shown on this page from the manual?

in my opinion, i think it acts on the lever attached to one end of the spring, and provides tension for the spring which is acting against the lever and arm coming up from the crank case. without the pin, both levers move and the spring never really acts on anything?

i cant really test the effect on power as its quite late and it will get way too smokey in the shed way too quick if i try in there lol!

oh, and there was no pin in there when i pulled the powervalve cover off btw - i just fashioned one up from a 5.5mm drill bit to try.

[barty5]

given it wasnt there my guess is it is used to set it up then removed. other wise what would hold it in??

[barty5]

http://fiche.worldofpowersports.com/wps/Honda_OEM/HondaDB.asp?Type=13&A=117&B=23

dont see it list in the part diagram either

[morg_nz]

given it wasnt there my guess is it is used to set it up then removed. other wise what would hold it in??

yeah sorry, ignore me i think, i think you are right about it being used to set up because im pretty sure if you leave it there it will stop the powervalve shaft from turning at all! which is kind of a bugger cause thats me back at square one!

[bogan]

looks like it stops the valve going more open than open, though kinda hard to tell from just diagrams, it looks like there is fuck all travel on the flap valves if both pins are in there though?

With my 98 the spring doesn't really do anything under normal operation, more of a buffer to stop them slamming open/closed with full force.

[morg_nz]

looks like it stops the valve going more open than open, though kinda hard to tell from just diagrams, it looks like there is fuck all travel on the flap valves if both pins are in there though?

With my 98 the spring doesn't really do anything under normal operation, more of a buffer to stop them slamming open/closed with full force.

yeah that would make sense about the spring

[bogan]

yeah sorry, ignore me i think, i think you are right about it being used to set up because im pretty sure if you leave it there it will stop the powervalve shaft from turning at all! which is kind of a bugger cause thats me back at square one!

pm me your address and I can come offer a second opinion on my way to work tomorrow, this usually occurs sometime between 9am and 11am (gotta love student life :D), or in evening if you are working during the day.

[barty5]

heres some ideas for you
http://twostrokemotocross.com/2009/05/budget-racer-2001-honda-cr125/

[bogan]

heres some ideas for you
http://twostrokemotocross.com/2009/05/budget-racer-2001-honda-cr125/

very interesting article, such simple mods you wonder why honda didn't design em that way. Though I gotta admit i've been looking at the two pics of the cylinders for ages and I can't spot what the difference is, can someone fill me in?

[Reckless]

That was a good read Barty Cheers!

[barty5]

not sure think they closed it up more on the left side.

[barty5]

i have found a 01 cr250 manual set up may be the same could be some help to you sizeable though