I have a 1971 Fox Scrambler and i've been messing with the carb on this thing. Just can't get it to work consistently, seems like i'm chasing my tail on it.
So decided to get a new carb, since they're like $15 each (including shipping!) In another thread there were some suggestions. I thought i would report here how the new carb(s) worked.
First one i bought was from ROP (rugged outdoor products, Bluffton IN). It's part number NJJ-631921, and it replaces the stock Tecumseh 631921 carb. I'm not sure that's the exact correct carb for an HS40, but it was what someone suggested, so I bought one. I got it off ebay and here was the link:
http://rover.ebay.com/rover/1/711-5...0001&campid=5335845805&icep_item=251086321740
With 961 sold to date, it seems to be a popular model.
It looks identical to the original HS40 carburetor, with a couple small exceptions. The choke lever is slightly different, but with some small bends, that was easy to fix. The choke lever now looks and positions the same as the original. The gas intake port was slightly different. No big deal, slight turn and it was positioned in the proper place. And last, the float bowl didn't have a sprung drain plug. So i used the original carb's float bowl on the new carb, because I like that feature. Also the float itself is plastic, opposed to metal in the original unit.
Hooked it up, and the bike started and ran great! just a couple small tweaks of the three carb adjustment screws, and the bike runs strong! Well worth the $15 total price for this unit.
I bought new carbs from two other sources also. I will report back with those when i get them and have a chance to install.
So decided to get a new carb, since they're like $15 each (including shipping!) In another thread there were some suggestions. I thought i would report here how the new carb(s) worked.
First one i bought was from ROP (rugged outdoor products, Bluffton IN). It's part number NJJ-631921, and it replaces the stock Tecumseh 631921 carb. I'm not sure that's the exact correct carb for an HS40, but it was what someone suggested, so I bought one. I got it off ebay and here was the link:
http://rover.ebay.com/rover/1/711-5...0001&campid=5335845805&icep_item=251086321740
With 961 sold to date, it seems to be a popular model.
It looks identical to the original HS40 carburetor, with a couple small exceptions. The choke lever is slightly different, but with some small bends, that was easy to fix. The choke lever now looks and positions the same as the original. The gas intake port was slightly different. No big deal, slight turn and it was positioned in the proper place. And last, the float bowl didn't have a sprung drain plug. So i used the original carb's float bowl on the new carb, because I like that feature. Also the float itself is plastic, opposed to metal in the original unit.
Hooked it up, and the bike started and ran great! just a couple small tweaks of the three carb adjustment screws, and the bike runs strong! Well worth the $15 total price for this unit.
I bought new carbs from two other sources also. I will report back with those when i get them and have a chance to install.
Last edited: