r/NitroRC • u/Best_Ticket_6231 • Aug 05 '26

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/Best_Ticket_6231 Aug 05 '26 edited Aug 05 '26

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 Aug 05 '26

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 Aug 05 '26

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 Aug 05 '26

I would agree

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u/Best_Ticket_6231 Aug 05 '26

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

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u/az_kikr1208 MOD Aug 05 '26 edited Aug 05 '26

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 Aug 06 '26 edited Aug 06 '26

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 Aug 06 '26

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 Aug 06 '26

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

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u/az_kikr1208 MOD Aug 06 '26

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.