I was wondering if a tachometer and/or speedometer could be put on a 400EX and where you could get them? My EX has an LA Sleeve bored to 453 cc's with Web cam, mild porting, 170 main w/o lid, white bro's CDI and full E-Series exhaust, 11:1 compression running on 112 octane, I geared it up to 16/36 with 22 inch tires, i belive it's in the 80 mph range, the bigger tires helped greatly for gearing and traction(Realtors-awsome!)Does anyone know when mine cuts out with White Brothers CDI Box? Stock is 9100 I beleive, In 500 foot dirt drag races I'm beating Raptors, not by much though and I don't think they were as good as riders as me.

 

Lots of guys use a quality bicycle speedo or a GPS unit to determine speed. Not sure about a tach though. Who built your engine? First 453 I have heard of. Have you ran any other 400ex big bores? Does your run a bit hot? Mysterious that I posted a reply earlier and it just disappeared (and it was'nt negative). Anyway...good luck!

 

Wow, first of all, nice EX!! Second, I put a bicycle speedo on my 400ex, used the kind with a magnetic pickup and mounted it to the left front spindle, then epoxied a magnet onto the inside of the rim. I looked pretty hard for a tach for my 400ex when I got it, and all I came up with is that Auto Meter makes a small tachometer for JR. dragsters, which are one-cylinder 4-strokes, so I think it would work ok on the EX, but it's a little over 100 bucks, so I never bought it.

 

Thanks for the information and complements, yep I love my EX. I haven't had any problems with the 453 cc sleeve, my local honda dealer did it. It doesn't heat up or vibrate much more than stock. I have seen a 480EX but thats about the limit, they get too hot and are unreliable, mine is very reliable. All I do is ride trails with it and it's a great machine.

 

Thanks for the advice. A guy is trying to sell me one for 32 dollars that sounds nice but it only goes to 64 mph, he said the other bike speedo don't go farther than that, is that true?? How fast is your EX, how far did the speedo go?

 

Well, I've only had mine up to like 58mph, but I assume that it'll go to 99mph. Since it's adjustable for tire size, it would have to be able to calculate speed for a wide range of input frequencies from the sensor, so the only limitation should be the display (which is two digits). That and, I think it said on the manual it'll go to 99mph, but I can't find it, so I can't really confirm that.