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  #21  
Old 04-26-2015, 01:49 PM
alexV alexV is offline
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Someone nearby was selling quad parts.Got four shocks, spindles and matching front hubs. He had a **** torque convertor for sale. And I already spend loads of money on a new simple clutch from outside the country
  #22  
Old 04-26-2015, 01:57 PM
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These moments are frustrating..
Anyways, here's day4 of the build: finished the mainframe and took some pics with the wheels.
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  #23  
Old 04-26-2015, 01:58 PM
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Friends visiting
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  #24  
Old 04-26-2015, 02:10 PM
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Getting better at welding, but still have to grind and redo some of them.
Almost no jig was used for this part. Just by following the tips mentioned earlier (weld order: outside edge, inside edge, then sides) gives good results and no bending.

Cutting the compound angles for the side-rails was interesting: three engineers debating: cut this way, no that way, no, flip and then like this
  #25  
Old 04-26-2015, 02:33 PM
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It is looking good so far. I will be following and keeping up with this thread.
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  #26  
Old 04-26-2015, 05:02 PM
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Looking good!
Good looking pooch, too.....he is cute.....
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  #27  
Old 04-27-2015, 06:07 AM
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Thank you.
Need chain and sprocket advice please.

1. Is chain size 428 strong enough? Because I found all the components in this size.
2. What do you think about an 1:6 fixed gear ratio, on 19 inch tires, centrifugal clutch, 9 HP engine. The clutch already has 1:2 reduction. Planning to get 12T small sprocket and 36T large sprocket. This gives the overall 1:6 ratio. There's the option to go larger/smaller on either sprocket.

The theoretical speed is 31 kmh when clutch becomes locked @2100 RPM
55 kmh @3600 max engine RPM

http://www.endmemo.com/physics/rpmlinear.php

Last edited by alexV; 04-27-2015 at 06:08 AM. Reason: add simulator website
  #28  
Old 04-28-2015, 12:40 AM
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Quote:
Originally Posted by alexV View Post
Thank you.
Need chain and sprocket advice please.

1. Is chain size 428 strong enough? Because I found all the components in this size.
2. What do you think about an 1:6 fixed gear ratio, on 19 inch tires, centrifugal clutch, 9 HP engine. The clutch already has 1:2 reduction. Planning to get 12T small sprocket and 36T large sprocket. This gives the overall 1:6 ratio. There's the option to go larger/smaller on either sprocket.

The theoretical speed is 31 kmh when clutch becomes locked @2100 RPM
55 kmh @3600 max engine RPM

http://www.endmemo.com/physics/rpmlinear.php
With 19" tyres, I would gear lower than 6:1. I would go 7 or 8:1. Especially if you are using a centrifugal clutch
  #29  
Old 04-29-2015, 06:44 AM
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Ok, I will follow your advice and gear 7:1.
  #30  
Old 04-29-2015, 07:03 AM
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Day 5 of the build:

Started on the back end frame, where the engine and rear axle will be. Again friends helping

The bearings are the most heavy-duty I found. They are self-centering, and were cheap at 35 lei a piece (about 9 US$) from the local flea market

The hinges are from 4mm thick steel, joined with M16 hex screw (M stands for metric). Those are teflon washers in between. I have my doubts about this solution, maybe it will start to rattle.
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  #31  
Old 04-29-2015, 07:08 AM
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Mocking up the seat again. That's my dad.

About that seat: although small, it has very wide rails. One rail is taller than the other, and lastly the rails are offcenter from the seat itself. I mean c'mon, stupid seat will take me a day to fit
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  #32  
Old 04-29-2015, 07:14 AM
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After 200+ welds, I present to you my finest
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  #33  
Old 04-29-2015, 07:22 AM
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Nice work Alex. You welds are looking good. Don't get too ahead of yourself, as you need to be less than 50% done to enter the build off competition this year
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  #34  
Old 04-29-2015, 07:34 AM
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http://www.diygokarts.com/vb/attachm...1&d=1430312206
I don't think your pivot points for your rear suspension has enough bearing surface.Have you thought about using some round tubing on one side and making a bushing out of delrin or some other material and installing it in the tubing and then using a bolt with a shoulder at least the length of the delrin bushing and not using the threaded part of the bolt as a bearing surface?
  #35  
Old 04-29-2015, 09:22 AM
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Quote:
Originally Posted by landuse View Post
Nice work Alex. You welds are looking good. Don't get too ahead of yourself, as you need to be less than 50% done to enter the build off competition this year
Again, thank you
Everyhing posted so far was done before I started my thread on this forum. Since I found out about the build-off I paused.
  #36  
Old 04-29-2015, 09:30 AM
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Quote:
Originally Posted by Desertduler View Post
http://www.diygokarts.com/vb/attachm...1&d=1430312206
I don't think your pivot points for your rear suspension has enough bearing surface.Have you thought about using some round tubing on one side and making a bushing out of delrin or some other material and installing it in the tubing and then using a bolt with a shoulder at least the length of the delrin bushing and not using the threaded part of the bolt as a bearing surface?
After seeing the result, I agree with you; and thanks for the tip. Will replace just the bolts for now, with ones that are not threaded all the way.
After I see this machine run, I'll fix what is not right.
  #37  
Old 04-29-2015, 06:27 PM
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Quote:
Originally Posted by alexV View Post
After seeing the result, I agree with you; and thanks for the tip. Will replace just the bolts for now, with ones that are not threaded all the way.
After I see this machine run, I'll fix what is not right.
You are doing a great job keep on going!
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  #38  
Old 04-30-2015, 03:02 PM
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Guys, need advice about brakes: Are front drum-brakes decently safe for a 1 seat go-kart?

The front wheel hubs I sourced have built-in mechanical drum brakes, and in good condition. The project originally calls for rear hydraulic disc brake, nothing in the front. Such a break system will cost alot. I'm not looking for high-performance, just reasonable safety.

WDYT?
  #39  
Old 04-30-2015, 03:15 PM
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Drum brakes should be OK in my opinion
  #40  
Old 04-30-2015, 08:41 PM
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Quote:
Originally Posted by alexV View Post
What is track?
Track is the side to side measurement of the wheels; as wheelbase is the length between the wheel centres from front to back, along the vehicle, track is measured from centre to centre of the wheels across the vehicle...

As most of the weight will be in the rear, some type of brake on the rear axle is essential
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