Had a chance to take my first proper ride on the new 125 this Saturday with a mix of trails and track. Ran like a top on the track with an occasional missed shift in the vicinity of second.
When I hit the trails I had a very hard time shifting into second.
I've decided to race only VMX this week at Barber and run the BSA in XC. Any advice on what's happening would be greatly appreciated.
Also, any advice on gearing for XC would help too.
Thanks,
Chad
(http://i8.photobucket.com/albums/a13/mike8335/IMG_6295.jpg)
Have you changed the transmission fluid? I had that problem and was told to put ATF type F in it and after a couple changes it seemed to fix it some. I change it after every race.
74 250 Hare scramble
2 68 Six Day (projects)
Ill give it a shot. Thanks
If you haven't or don't have one, pick up a manual from Al Buehner.
http://www.pentonpartsusa.com/
74 250 Hare scramble
2 68 Six Day (projects)
Missed shifts? Its a Sachs.
Brian
Chad, Sachs engine requires deliberate shifting. You can't just jab at the lever. While at Barber have an experienced Sachs man ride your bike to determine if you have a problem. Generally speaking, 1st gear is for bailout only. Gear your bike so you can just use 2nd for slow stuff. I adjust my shifter so 3rd to 2nd down shift is positive. Fat boy like me can't afford to miss a gear on the big hill, need to be able to downshift and keep the revs up. The tiny Sachs clutch is pretty tuff and you can use it to stay out of 1st too. Back in the day you were advised to use the clutch to shift. I don't. Slow and deliberate is the trick. When you do miss a cog, you have to let the revs die - you 'll learn. JP Morgan has a selector key if you determine you have excessive wear. CMF is fantastic Classic race bike. Welcome to POG and good luck. -EP
Ernie P.
Chattanooga, TN
Ernie,
What type of gearing are you running?
Thanks,
Chad
Quotequote:Originally posted by Ernie Phillips
Chad, Sachs engine requires deliberate shifting. You can't just jab at the lever. While at Barber have an experienced Sachs man ride your bike to determine if you have a problem. Generally speaking, 1st gear is for bailout only. Gear your bike so you can just use 2nd for slow stuff. I adjust my shifter so 3rd to 2nd down shift is positive. Fat boy like me can't afford to miss a gear on the big hill, need to be able to downshift and keep the revs up. The tiny Sachs clutch is pretty tuff and you can use it to stay out of 1st too. Back in the day you were advised to use the clutch to shift. I don't. Slow and deliberate is the trick. When you do miss a cog, you have to let the revs die - you 'll learn. JP Morgan has a selector key if you determine you have excessive wear. CMF is fantastic Classic race bike. Welcome to POG and good luck. -EP
Ernie P.
Chattanooga, TN
I'm running 12/57 on my 100. Can you put some more pictures of your bike up? The front brake backing plate is on the wrong side, and the rear wheel doesnt even look like a Penton rear wheel.
Brian
Brian,
I'll post some more pics tonight. I have a feeling it's a bitsa. My current theory on the rear wheel is that it's from an earlier model. It has 4 bolt mounts on the sprocket.
Thanks,
Chad
I dont think its a Penton rear wheel, they all had a separate sprocket carrier with a cush drive in the hub until the 250s came out. The center hole for the sprocket was very large, you cant even see the center hole on that sprocket. The front wheel/brake looks like its off a different bike too because I dont see a brake backing plate stay, it looks like the brake baking plate is held with a lug on the fork leg.
Brian
Okay. I did my homework. The bore measured ~54.55. So it is a 125 or as Dale said, "a worn out 125" :)
Here's some pics I snapped tonight:
(http://i8.photobucket.com/albums/a13/mike8335/0A5933DF-BDCA-478E-81F0-1FBED9ADCD39-1389-00000085AF5EB12F.jpg)
(http://i8.photobucket.com/albums/a13/mike8335/19B6CE9B-6FEE-4025-9C8E-0C44016C7B52-1389-00000085A7D86B2E.jpg)
(http://i8.photobucket.com/albums/a13/mike8335/A9282258-A0C0-4E7E-8B5B-052B5240D372-1389-00000085A0CA48A7.jpg)
(http://i8.photobucket.com/albums/a13/mike8335/98E0E10D-A712-4D2D-8071-6602E301AFB9-1389-00000085968499AE.jpg)
Definitely not Penton wheels at either end. They actually look like Honda or Yamaha wheels...donno.
Brian
You'd think if somebody was going to swap out the wheels they'd at least bolt on some alloys. Thanks for info brian.
Off to ebay..
Chad,
Honda TL or MT-125 wheels for sure,
also looking at the 1st photo of the bike, appears to have a Steel Tanker cyl. or Sachs/DKW cyl. with the cut fins for pipe clearance,
great race report :-))
Mike Gallagher, NJ.
[email protected]
Occasionally grit will work it's way into the open end of the sprocket shaft and into the shift selector rod/gears. An overlooked maintenance item is to remove, clean, and pack the ignition side cover where the VDO drive accepts the end of the sprocket shaft with grease. A clean interior is a happier shifter ;)
Dale Fisher
Penton Owners Group - Memberships
Facebook - Cheney Twinshock Owners Group - Administrator
70 Six-Days
71 Six-Days (Brother Dave's)
73 Jackpiner
74 Berkshire
And some silly other bikes...