Author Topic: Zilla High Speed Testing (Read 2279 times)

Zilla273 · « **on:** April 13, 2013, 10:49:14 am »

got my 500 out today and got the jetting on the fat side bc its cold, my friend wanted to do some GPS runs, with 14-42 gearing, 20 inch holeshots(9lbs air). i got 90.2 mph! and its toped out in a short distance, feels as if it could easily pull 15mph more, anyone else got any numbers with what gearing tires?

Buckeye513 · « **Reply #1 on:** April 13, 2013, 01:47:09 pm »

I'm planning on 14-42 gearing does your bike have some low end with that gear set up or should I get a 43 or 44 rear for more low end? Gonna be running a q pipe and v2 or 3 reads and a bore out mikuni carb with a port job from MHR.

LT500Kid · « **Reply #2 on:** April 13, 2013, 10:34:04 pm »

buckeye not sure what kind of riding you do but 14/42 is what I run and seems to be great I may run a 43 rear and try it if I can find one for a z400 sprocket hub. Its nice to have options too.

PCS · « **Reply #3 on:** April 14, 2013, 03:33:54 am »

what motor mods do you have zilla?

Zilla273 · « **Reply #4 on:** April 16, 2013, 02:28:14 pm »

ive got hpr porting and x19 pipe, 41pwk carb, tudors reed assembly, cool head 57cc dome modified by jerry

Zilla273 · « **Reply #5 on:** April 16, 2013, 02:36:29 pm »

yeah i like the 14 42 gearing, i had 22inch rear dominator tires and it was alil to much gear for trails, i never gps'd the 22's but it was considerably faster on top, im saying high 90's..

MotorGeek - Jerry Hall · « **Reply #6 on:** April 16, 2013, 03:20:43 pm »

Put a 15 tooth counter shaft sprocket on it and it will probably add another 5 to 10 MPH. Make sure your tires are rated for those speeds.

Zilla273 · « **Reply #7 on:** April 16, 2013, 04:45:50 pm »

i gota 38 rear sprocket i thought about tryn, i also got 22inch tires id liked to try but thr 2ply and they narrow up and grow like drag car tires when u get to 4rth gear, i dont really trust em. they go from around 12inch to 6inch approaching the top of 4rth

Dezsled · « **Reply #8 on:** April 16, 2013, 05:14:40 pm »

We ran 15x38 for a crazy top end speed down in Baja.

Zilla273 · « **Reply #9 on:** April 16, 2013, 05:33:28 pm »

wow did u get any speed numbers???

Dezsled · « **Reply #10 on:** April 16, 2013, 06:24:08 pm »

No we didn't... We should have

Iceracer · « **Reply #11 on:** April 16, 2013, 07:38:51 pm »

15-37-39 is what I run for the dirt track. Clay I run a 13-14 with the same rears depends on hook up and straight away speed.

PCS · « **Reply #12 on:** April 16, 2013, 10:41:23 pm »

no super accurate but ill put my phone in my pocket and turn on a gps speed measuring app and record some speeds that way.

GrkGuy · « **Reply #13 on:** April 17, 2013, 06:27:37 am »

Quote from: MotorGeek on April 16, 2013, 03:20:43 pm

Put a 15 tooth counter shaft sprocket on it and it will probably add another 5 to 10 MPH. Make sure your tires are rated for those speeds.

maybe someone should call Q to see what tires he runs on the street, or in the real world..

Zilla273 · « **Reply #14 on:** April 17, 2013, 04:08:37 pm »

Well we did an ltr with474 kit and hot cams, geared one up in front and20 inch tires, got 85 mph,took alittle more distance to get it. Also ltrs are 18inch tires stock. I think it could pull 90 but it would need a country mile, dame good if ya ask me

Zilla273 · « **Reply #15 on:** April 17, 2013, 04:10:09 pm »

Heres both bikes

Zilla273 · « **Reply #16 on:** April 18, 2013, 04:39:20 am »

Hey PCS, Ichecked that iPhone app with my truck speedo, it seems to be dead on with a good signal

Duneatic70 · « **Reply #17 on:** April 18, 2013, 11:23:08 pm »

I run 14/43 with an 70hp HPR complete engine package #19 pipe, 20-11x10's & ive had mine at 90 mph in the sand on a good long straight away! Was taken with a CHP LYDAR gun my chp buddy has!!!!

Zilla273 · « **Reply #18 on:** April 19, 2013, 09:53:27 am »

Yeah mines a 75-79hp sett up by hpr, it pulls it quick, I never tryed in sand though , ik it pulls through fifth gear alot faster with the x19 then my previous aaen pipe did

Zilla273 · « **Reply #19 on:** April 30, 2013, 05:58:19 pm »

i went from a 42 rear sprocket to a 38 tonight, I buzzed up the road for 3 gears, seems faster everywhere

, this weekend I might see what the Gps reads

Buckeye513 · « **Reply #20 on:** April 30, 2013, 06:58:15 pm »

If you have an iPhone you can get a speedo app for free.

Zilla273 · « **Reply #21 on:** April 30, 2013, 07:07:03 pm »

yeah that's what ive been using, seems vary accurate with a good signal, it went 90 with the 42rear, with the 38rear im gona guess 96mph, anyone wana throw a guess in??? il find out Saturday!

Dezsled · « **Reply #22 on:** April 30, 2013, 07:10:35 pm »

Quote from: Zilla273 on April 30, 2013, 07:07:03 pm

yeah that's what ive been using, seems vary accurate with a good signal, it went 90 with the 42rear, with the 38rear im gona guess 96mph, anyone wana throw a guess in??? il find out Saturday!

I just regeared from a 38 rear .... Post your speed readings would ya? Just curious at the top end

Zilla273 · « **Reply #23 on:** April 30, 2013, 07:39:31 pm »

yeah il have some numbers this weekend

MotorGeek - Jerry Hall · « **Reply #24 on:** April 30, 2013, 08:22:12 pm »

Quote from: Zilla273 on April 30, 2013, 05:58:19 pm

i went from a 42 rear sprocket to a 38 tonight, I buzzed up the road for 3 gears, seems faster everywhere , this weekend I might see what the Gps reads

The 38 tooth will allow the engine to operate at or closer to the power peak for a longer period of time than the 42 tooth sprocket. Make sure you have high octane fuel, the right heat range spark plug, and the right main jet for the atmospheric conditions!

Which transmission are you running. 87 or the 88 to 90 model transmission?

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Author Topic: Zilla High Speed Testing (Read 2279 times)

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