Cold Stick or Lean Stick

Erik Frank · Posted: Mon Aug 13, 2001 11:26 am Post subject: Cold Stick or Lean Stick

That basically is a function of what the piston to wall clearance is inside a given motor. If you have a stock MX engine (or an engine set up with stock type piston to wall clearances), they are set up pretty tight, and you can very easily cold stick one. It can also be a (weaker) function of the particular piston construction. For example, a cast piston expands differently than forged piston. Both OEM honda and HRC (Honda RS) pistons are cast.

hope this helps,
erik

Vernon Head · Posted: Mon Aug 13, 2001 12:53 pm Post subject: Cold Stick or Lean Stick

Considering that many people try to keep their water temp under 140 degrees, isn't this a pretty small window?

Matt Kull · Posted: Mon Aug 13, 2001 1:29 pm Post subject: Cold Stick or Lean Stick

I think that it is more of a function of getting the metal up to temp so that it has expanded all the way through.

Steve Clark · Posted: Mon Aug 13, 2001 2:49 pm Post subject: Cold Stick or Lean Stick

Pardon my rookie question . . .

Are the temperatures for water in celsius or fahrenheit (sp?)

So when I first run my shifter I should do a couple of easy laps to check temps?

Russ McGrane · Posted: Mon Aug 13, 2001 3:19 pm Post subject: Cold Stick or Lean Stick

quote:
Originally posted by Steve Clark:
Pardon my rookie question . . .

Are the temperatures for water in celsius or fahrenheit (sp?)

So when I first run my shifter I should do a couple of easy laps to check temps?

Water temp is in F. At 135 C it would be called steam.

John Wehrheim · Posted: Mon Aug 13, 2001 10:29 pm Post subject: Cold Stick or Lean Stick

I have heard that you can stick a motor by not having the motor temp high enough. Is this true or is it just that the carb jetting was not set right? What is the preferred temp for a 125 and an 80cc. I have heard around 135 degrees.

Tim Blaney · Joined: 18 Jul 2001 Posts: 1127

Yes it is true. I have my motors built by Paul Leary at Hi-Tech and he told me that under no circumstances was I to run my motor hard before the water temp was at least 120, preferrable 125.

Steve Clark · Posted: Tue Aug 14, 2001 2:52 am Post subject: Cold Stick or Lean Stick

Oh yeah. I knew I should have paid attention in science class.

Like I said rookie question.

Todd Stoffer · Posted: Tue Aug 14, 2001 5:14 am Post subject: Cold Stick or Lean Stick

quote:
Originally posted by Russ McGrane:

Water temp is in F. At 135 C it would be called steam.

Unless it's under pressure.

Jon Betts · Posted: Tue Aug 14, 2001 5:46 am Post subject: Cold Stick or Lean Stick

OK 120F min temp? I ran all race day last race with steady 122F water and 1300F EGT plug looked great maybe even still a bit rich. it seems that water was too cold and EGT too hot what should I do? By the way it's a stock CR125

Thanks JB

Scott Davis · Posted: Tue Aug 14, 2001 6:13 am Post subject: Cold Stick or Lean Stick

No matter which way you stick it, it is not a cheap fix.

Tim Blaney · Joined: 18 Jul 2001 Posts: 1127

quote:
Originally posted by Jon Betts:
OK 120F min temp? I ran all race day last race with steady 122F water and 1300F EGT plug looked great maybe even still a bit rich. it seems that water was too cold and EGT too hot what should I do? By the way it's a stock CR125

Thanks JB

JB, slap a strip of tape on your radiator to get the water temp up. Be sure to fold a tab into the tape, that way if the temp goes too high, you can reach over and yank the tape off.

John Wehrheim · Posted: Tue Aug 14, 2001 11:43 am Post subject: Cold Stick or Lean Stick

Thanks for the information, but what is the optium temp for a 125 and 80cc. I have heard some guys run them up around 170 degrees. Ouch. But what is the preferred temp. I usually try around 135.

Tim Blaney · Joined: 18 Jul 2001 Posts: 1127

John,

I have always been told that 135-140 is optimum. 170 seems a "bit" on the high side.

Terry Tilton · Joined: 20 Jul 2001 Posts: 58 Location: Austin, Tx

170 could be head temp. They tend to run about 30 degrees hotter than the water temp.