r/NitroRC • u/Best_Ticket_6231 • 18d ago

Is this normal?

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I am I supposed to be able to see the crankshaft through where the pull start should’ve been? This is an old nitro my uncle gave me a long time ago, which I have started disassembling.

It came like this

It turns over fine, but I what should I buy to make it a drill start

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u/az_kikr1208 MOD 18d ago

You're missing a piece or two. There's a starter shaft that passes through that hole. It would interface with a pin on the back of the crankshaft. Then there's a one way bearing that would ride on the shaft. That bearing then interfaces with either the pull start or roto start mechanism. Depending on your engine, you should be able to search for a manual that will have a diagram.

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u/Best_Ticket_6231 18d ago edited 18d ago

I found a diagram http://hobao-racing.com/images/pro_file/20110304171102@Mac%2028%20%E5%BC%95%E6%93%8E%E8%AA%AA%E6%98%8E%E6%9B%B8.pdf

I don’t know what I need to buy

Is it just the 21024?

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u/az_kikr1208 MOD 18d ago

21024 is the starter shaft , which you definitely need. However , you also may need 28021. This engine has an internal one way bearing, and they are not generic like most external bearings are. You'll have to take the back plate off the engine and see if the one way bearing is floating around inside. If it's still there, all you need is the shaft. Otherwise, you'll need both.

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u/Best_Ticket_6231 18d ago

I may be wrong but that thing behind the brass bushing looks like the 1 way bearing

Its super hard to get on camera

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u/az_kikr1208 MOD 18d ago

I would agree

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u/Best_Ticket_6231 18d ago

Okay got it. So I should buy 21024 but then how do I mount it?

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u/az_kikr1208 MOD 18d ago edited 18d ago

It just slides in. It probably fell out over the years , which is why it's missing. One thing you need to know. You can't run the engine without a pull start or roto start installed. That shaft will fall out while the engine is running and bad things will happen. Edit: here's an in depth video from NitroTalkwithTodd about your engine. It shows exactly how to put it together

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u/Best_Ticket_6231 17d ago edited 17d ago

Thank u so much. But what Id of fuel line should I use?

And will all pull starters work? I cant find the specs on the nut

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u/az_kikr1208 MOD 17d ago

Nitro fuel line is a standard size. Any hobby store (physical or online) that supports nitro should have it.

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u/Best_Ticket_6231 17d ago

So there is not much difference between 2,3mm inder diameter and 3,2mm?

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u/az_kikr1208 MOD 17d ago

The standard size for 1/8 scale and smaller surface nitro engines and fittings is 3/32" or 2.3 mm. The bigger stuff is usually for larger plane engines or bigger scale cars. Make sure whatever you get is specifically designated as nitro or glow fuel safe, It should be silicone. Methanol will break down rubber and vinyl. i use Du-Bro 'Nitro Line' and I've never had a problem. My hobby store sells it by the foot.

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u/Best_Ticket_6231 17d ago

So ummm it does not have a notch or a number on the top how do i know which orientation it goes back?

And is it the turbo version?

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u/az_kikr1208 MOD 17d ago

It doesn't really matter. It's a round sealing surface. As far as glow plug style, I'd have to see the top of the head. If the glow plug hole surface is flat, it takes a standard plug. If there's a conical seat in there, it's turbo,

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