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plans for a gokart
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Bull Frog Go Kart
Back in 2003 to 2004 J. Henry posted the following plans for free. The plans were on JMHKarts.com which is no longer a valid site.
Since they were freely posted before the site shut down, they will have no problems being freely posted now. I have no way to contact the originator of the plans.
Enjoy the plans, share the plans, and give a special thanks to J. Henry, whoever and wherever he may be.
Jim
89.5"
24" 28"
11.5"
24"
12"
26"
12"
4"10.5"
21"
106°
164°
Lower Frame Material1.5" X 1.5" X 1/8" Hollow Square Tube (typ.)
Weld All Joints (typ.)
jmhkarts.com - Bullfrog Kart
Page
Scale: 1" = 1'Drawn: J. Henry
Date: 10/15/03
Lower Frame Layout1
14
Main FrameRail
Rear FrameCross
Side Rail Forward Side Rail
ForwardSide SupportMiddle
Side Support
Rear SideSupport
MainFrameSupports
45°
89-1/2"
Main Frame Rail (2 items)
24"
45° 45°
Rear Frame Cross (1 Item)
21"
Main Frame Supports (3 Items)
12"
45°
Rear Side Support (2 Items)
10-1/2"
24"
45° 82°
29-1/4"
82° 53°
Side Rail (2 Items)
Middle Side Support (2 items)
Forward Side Rail (2 Items)
4"
53°
Forward Side Support (2 Items)
Lower Frame ComponentsNot To Scale
jmhkarts.com - Bullfrog Kart
Page
Scale: 1" = 1'Drawn: J. Henry
Date: 10/15/03
Lower Frame Components2
14
26" 24" 44.5"
24" 48" 22"
164°155°
115°
106°
115°
155° 164°
106°
Upper Lower Frame Material1.5" X 1.5" X 1/8" Hollow Square Tube (typ.)
Weld All Joints (typ.)
jmhkarts.com - Bullfrog Kart
Page
Scale: 1" = 1'Drawn: J. Henry
Date: 10/15/03
Upper Frame Layout3
14
Rear Side Rail
Side Rail
ForwardSide Rail
Rear Cross Rail
Forward Cross Rail
28 - 5/8" 46 - 3/8"
24" 22"
24"
57° 78° 82° 53°
78° 82° 53° 53°
57° 57°
Rear Side Rail (2 Items)Forward Side Rail (2 Items)
Side Rail (2 Items) Forward Cross Rail (1 Item)
Rear Cross Rail (1 Item)
Upper Frame ComponentsNot To Scale
jmhkarts.com - Bullfrog Kart
Page
Scale: 1" = 1'Drawn: J. Henry
Date: 10/15/03
Upper Frame Components4
14
2"
4"
2.-3/4"
1/4"
1"
1"
Dia. = 7/8" R= 1/2"
2"
4"
Spindle CradleSpindle Cradle - End View
Spindle Cradle - Side View
Spindle Cradle - Top View
Perspective View
3"
3"
1-1/2"
34"
85° 85°
34"
Axle Beam - Top View
Axle Beam - Front View
Axle Beam - End View
Axle Beam - Perspective view
Front Axle Beam 3" X 1 -1/2" X 1/8"Mild Steel Rectangular Hollow Tube
See Spindle Cradle DetailTop
Bottom
See Note
Note:
The axle beam angles and the spindlecradle details provided here are onlyto be used if you are using the EZ-GOGolf Cart spindle and hub assembly.You will have to make adjustmentson the axle beam to best suit thespindle and hub assembly you chooseto use.
jmhkarts.com - Bullfrog Kart
Page
Scale: 1" = 1'Drawn: J. Henry
Date: 10/15/03
Front Axle/ Spindle Cradle Detail5
14
Spindle Cradle Detail (see note)
Axle Beam Detail
Front Axle BeamBottom Flush WithBottom Of Frame
Lower frame
5"
5"
17"
34"
Lower Frame
Axle Beam
Weld all Sides (Typ.)
jmhkarts.com - Bullfrog Kart
Page
Scale: 1" = 1'Drawn: J. Henry
Date: 10/15/03
Axle Beam Placement6
14
18"
81°
10-1/2"
81°
2-11/16"14-7/8"
45°45° 81°
Rear Upright Supports(2 Items)
Middle Upright Supports(2 Items)
Middle Upright Bracing(2 Items)
Forward Upright Support(2 Items)
Placement of Upright Supports on Lower Frame
Axle Beam
Front Axle Beam
Rear Upright Support
Middle Upright Support
Forward Upright SupportMiddle Upright Bracing
Upper frame
Lower frame
jmhkarts.com - Bullfrog Kart
Page
Scale: 1" = 1'Drawn: J. Henry
Date: 10/15/03
Upright Supports7
14
Lower frame Front Axle BeamBottom Flush WithBottom Of Frame
6"
16"
11-5/8"
97°97°
Rack and Pinion Mount Bars (2)
Note 2:The placement of these Rack and PinionMounts are based on the recommendedHyundai Excel Non Power Assisted Rackand Pinion. Placement will have to be de-termined by the builder for any other substituted rack and pinion solution.
Fully weld to frame (typ)
24-1/2"
Important:Do not weld these pieces in atthis time if you plan on using theadjustable motor mount. Pleaserefer to the motor mount drawing.
8-1/2"
8-1/2"
Engine Mount Rails (2)
Note 1:The placement of these engine mount railsare for use with the adjustable engine mountset up and are subject to change for your specific engine and drive system set up.
See Note 2
See Note 1
See Note 1
jmhkarts.com - Bullfrog Kart
Page
Scale: 1" = 1'Drawn: J. Henry
Date: 10/15/03
R& P and Engine Rails (optional)8
14
Material:Approx. 50" of 1.25"X1.25"X1/8" Square Steel Tube
46"
45"
R=4" @ Centerline(Typ.)
1.25"X 0.95" Mild Steel Tubing
1.25"
46"41.3/8"
4.625"
35-3/4"
43-3/4"
1.25"X 0.95" Mild Steel Tubing
Main Roll Bar Hoop Front ViewMain Roll Bar Hoop Side View
Middle Lower Cross Bar All roll bar material is 1.25"o.d.x095" Mild Steelnotch to fit with an angle grinder and file.Notch ends with a tube notcher or test fit and their final positions.and notch ends only after test fitting parts intothan indicated on plans during fabrication. CutLeave the ends indicated approx. 1/2" longer
Tubing
Notes:
See Note
22" To Center of Cross Bar
See Cross Bar Below
jmhkarts.com - Bullfrog Kart
Page
Scale: 1" = 1'Drawn: J. Henry
Date: 10/15/03
Main Roll Bar Hoop9
14
142°
124°
30-1/2"
43-3/4"
3-1/2"
R=4"
R=4"
81°
7-1/2"
27-5/8"
R=4"
124°
21-1/2"
See Note
See Note
Notes:
Leave the ends indicated approx. 1-2 Inches longerthan indicated on plans during fabrication. Cutand notch ends only after test fitting parts intotheir final positions.Notch ends with a tube notcher or test fit and notch to fit with an angle grinder and file.All roll bar material is 1.25"o.d.x095" Mild SteelTubing
22"
32"
20"
Rear Cross Bar
Middle Overhead Cross Bar
Front Cross Bar
See Note
See Note
See Note
jmhkarts.com - Bullfrog Kart
Page
Scale: 1" = 1'Drawn: J. Henry
Date: 10/15/03
Roll Bar Components10
14
12-1/2"
26-5/8"7-1/2"
5"
30"
Rear Cross Bar
Middle Overhead Cross Bar
Front Cross Bar
Lower Frame
upper frame
22"
Middle Lower Cross Bar
jmhkarts.com - Bullfrog Kart
Page
Scale: 1" = 1'Drawn: J. Henry
Date: 10/15/03
Side Roll Bar Placement11
14
Main Roll Bar Hoop
Rear Cross BarMiddle Overhead Cross Bar
Front Cross Bar
jmhkarts.com - Bullfrog Kart
Page
Scale: 1" = 1'Drawn: J. Henry
Date: 10/15/03
Overhead Roll Bar Placement12
14
Lower frame Front Axle BeamBottom Flush WithBottom Of Frame
Lower Frame
Axle Beam
Jack Shaft BearingHeavy Duty Self LockingPillow Block Bearing - 3/4" I.D.
Main Axle BearingHeavy Duty Self LockingPillow Block Bearing - 1" I.D.
42" Flexpruf Steel AxleStandard 2" ends Stepped
to 3/4" Threaded end. 42" overall length
11"
13" SteelJack Shaft
4-1/2"
8-1/2"
8-1/2"
jmhkarts.com - Bullfrog Kart
Page
Scale: 1" = 1'Drawn: J. Henry
Date: 10/15/03
Jack Shaft Layout13
14
jmhkarts.com - Bullfrog Kart
Page
Scale: 1" = 1'Drawn: J. Henry
Date: 10/15/03
Chain Tensioner Details14
14