Try a compression test. Mine did this and it had a burned valve.
Phil Ethier West Side Saint Paul Minnesota USA
1962 Triumph TR4 CT2846L
1973 Triumph Stag LE22439UB "uncle jack"
1979 Caterham 7
1994 Miata C-package
2004 Suburban 8.1
2007 Saturn Ion 3 2.4
pethier [at] comcast [dot] net
http://www.flickr.com/photos/pethier
http://www.triumphtransamerica.org
http://www.mnautox.com
----- "Phil Nase" <nases@verizon.net> wrote:
> From: "Phil Nase" <nases@verizon.net>
> To: "shop-talk@autox.team.net Talk List" <shop-talk@autox.team.net>
> Sent: Saturday, February 6, 2010 11:17:53 AM GMT -06:00 US/Canada Central
> Subject: [Shop-talk] Snow blower repair
>
> I have a 15 year old Ariens 7hp Tecumsah engined 2 stage snow blower.
> It
> starts and runs well but no longer pitches the snow more than 6-8
> feet.
>
> I have adjusted the idler pulley and the cable to the clutch is tight
> enough.
> I see no other adjustments to make for the the impeller. I've tried
> every
> thing I know to fix it but nothing has changed. The belts have very
> little
> time on them. I haven't worked on the throttle and am wondering
> whether I
> should have more power under load.
>
> My dad had a similar unit with a 6hp engine and that thing would throw
> the
> snow clear across a 30 foot street.
>
> Mine never did move the snow like his did but it is getting unusable.
>
> Any ideas? Thanks.
>
> Phil Nase
> Quakertown, PA
> http://home.comcast.net/~philnasecpa/
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