UK Arachnid build

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Wobbly

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Grizz - The transmission set up will be sprocket on the reduction gearbox linked via chain onto another sprocket on the solid rear axle. I haven't considered a method of mounting the engine yet, but from what I understand I need some method of tensioning the chain by adjusting the engine mount. I'll be watching your build closely for ideas.

Theo - There is plenty of width around the knee area, however where the frame tapers in at the front it becomes quite tight. If I were to build this part again I would widen this area by 2" and adjust the angles to maintain the same overall width.
 
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Wobbly, is there any vertical and diagonal tubing between the floor and the upper tube?
 
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Theo, only what you can see in my pics. The frame is very strong, I don't think it needs any more bracing. The rear sub frame, in my opinion, does need additional bracing for an engine over 10hp.
 
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Wobbly, I see you don't have your shocks tabs mounted on the frame yet. That's good. Part #MF2.5-90 page 23 is too short. Should be at least 4 inches in order for shock tabs to line up in a straight line. Take a look at my thread and you will what I mean in the pictures. My shock tabs are offset, causing the shocks to angle into the center. Theo says this is no good. :mad2: I'll have to cut these off and extend them by 1 1/2 inches at least. Will probably run a support up to the side frame to brace the shock tab as well.
 
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I saw the pics Grizz, it dosen't look good. I left those stubby arms off the seat back because I wasn't sure how it was all going to line up, I was going to sort it out once the rear sub frame was mocked up. It had occured to me that those little arms are going to take a fair bit of force and would need additional bracing. The Arachnid, or the Ah-crap-nid as I like to call, it strikes again!
 
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It sounds best if you pronounce it "Ohhh crap! Nid!" as you uncover another design flaw :)
 
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I already have bought 4 shocks, they are 13" in length, probably too long for the front but should be ok for the rears. It would be possible to add a riser block onto the rear subframe and attach the top of the shocks to the upper side tube as you suggest. Good idea Theo :thumbsup:

EDIT - Just thought, the upper side tube may not be wide enough, Grizz should be able to confirm though.
 
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I already have my shocks as well, but they are CHEAP Chinese mechanical shocks, I will be upgrading once I get this chassis rolling.

Have to add a small extension to the upper rail in order to have the tab at the back or attach a tab under the rail about 4 inches in and it would line up in a straight line, but the angle would increase significantly.

Nice shocks on that site Theo. I was looking around here for a set of 12" harley shocks that someone might have replaced with a set of progressives that I could pick up on the cheap, but none yet
 
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Nice one Bill :)

I got a bit carried away today and ordered some parts for the steering setup. It took 2 days and a post on another forum to find a UJ suitable for my new rack, it seems that a 5/8" UJ is un-available in the UK but luckily a hot rod builder came through for me. Not cheap at nearly £50 though :worried2: It does have the correct 5/8" 35 spline one side and a 3/4" DD bore the other which will save me loads of work.

I also tracked down a quick release steering boss that is designed for a 3/4" steering shaft, simply weld the small union onto the shaft and the boss locks onto that. Very neat and a good price at £20. Which leads on nicely to a question for you chaps - Can I use standard 3/4 solid mild steel round bar for the steering column?
 
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The hub is very similar to the $18 one it that link. I thought it would make clambering in and out of the buggy a little easier, plus it offers a little bit of security to prevent unauthorised trips in my absence.
 
r97

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lol i can see some one trying to drive it away with a(what was it, 11") rack and no steering wheel,lol
 
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The first one looks great, it has the same clutch as mine and the price is about right. I think the second would be too big for the Ah-crap-nid, if you want to go that big then you may as well go for a motorbike engine and gearbox.

There are a lot of GX390 clones on the market, and lots of spares too. THIS is a good website with lots of tune up accessories and some nice written guides. I'm running my GX390 as stock for a little while, then I'll fit an advanced timing key and maybe remove the regulator, plus replace the intake filter with one of THESE and fit a better exhaust.
 
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Made a small amount of progress today. The quick release steering boss turned up and I am very pleased with it. Started work on the wishbones but there are a few issues. The main problem is the width of my front suspension block, which is considerably wider than the plans call for. I'm stuck with it now so I have to work around it. I'm trying to keep the front wheels the same width/slightly narrower than the rears, which means I have to reduce the length of the wishbones. I've calculated that they need to be approx 10" long, which is around 4" shorter than the plans call for. So a quick question for you, do you think 10" is too short for the wishbone?
 
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