halftrackinfo

general discussion => what's on your mind? => Topic started by: Cleprechaun on November 07, 2018, 05:48:11 PM

Title: Top speed and RPM
Post by: Cleprechaun on November 07, 2018, 05:48:11 PM

I have read that 45 mph is the top speed of a “White HT”. I opened mine up on a flat dirt road today and got it up to 33 mph according to the old speedometer. It was at 3000 rpm according to a modern cheap tach. Does this seem right ? The engine is a fresh rebuild and seems to run fine.

Title: Re: Top speed and RPM
Post by: Hammerhead on December 24, 2018, 02:55:24 PM

Mine was 35 MPH and I had to check with my buddy who has had his HT a long time.  He said that was his top speed too.  Going down a hill he said he reached 38 MPH. :D  I had heard 45 also.

Title: Re: Top speed and RPM
Post by: spec4don on December 24, 2018, 05:59:42 PM

I had mine up to about 40 once, 30 is just Fine!

Don G.

Title: Re: Top speed and RPM
Post by: Cleprechaun on January 06, 2019, 09:24:07 PM

I figured it out. The “economize” valve in the carburetor needed changing. Dramatic difference.

Title: Re: Top speed and RPM
Post by: Cleprechaun on January 07, 2019, 10:07:33 PM

This fixed it

Title: Re: Top speed and RPM
Post by: spec4don on January 08, 2019, 10:28:19 AM

Did you clean yours up or put in a new one? If you put in a new one where did you find it?

Don G.

Title: Re: Top speed and RPM
Post by: Cleprechaun on January 30, 2019, 10:02:28 PM

I put in a “new one” from an original old carb rebuild kit

Title: Re: Top speed and RPM
Post by: autocar925 on January 31, 2019, 11:58:39 AM

43 on a long straight run at sea level.  From cold startup, it picks up about 5 MPH in top speed after the tracks get warm.  Tracks suck up a lot of power and they limber up as they get warm.  Seems to have a sweet spot at 28 MPH.  Everything clacking and buzzing along comfortably. 

Title: Re: Top speed and RPM
Post by: spec4don on January 31, 2019, 12:12:27 PM

That’s about right 30 seems the sweet spot for mine.
Don G

Title: Re: Top speed and RPM
Post by: Cleprechaun on June 09, 2019, 11:28:48 PM

UP DATE:
I can hit 45 easy, but chicken out at 40 mph. The trick was:
New engine broke in at around 100 miles.
Tightened up carb screws and replaced economize valve.
New battery. Had to jump start with old one.
Tracks loosened up I think.
K&N air filter. Original was shot.

Title: Re: Top speed and RPM
Post by: Cleprechaun on April 14, 2020, 10:20:56 PM

Update: My motor has loosened up, Iv gotten braver, and once the tracks warm up (10 miles) I can hit 50 mph when I’m not paying attention.

Title: Re: Top speed and RPM
Post by: R.E.Co. on April 15, 2020, 07:12:16 AM

My top speed was 42 MPH without too much tinkering with the carb.  Im sure if I worked more on the mix ratio it could ab alittle higher but who needs to go that fast? Just adds more wear and tear on the halftrack.

Title: Re: Top speed and RPM
Post by: spillmk1 on April 15, 2020, 12:07:13 PM

If you want speed and a MV...
You're gonna need to loose the tires/tracks and get some wings!!!  ;)