Anyone have some ideas about what to do with those odd screw sizes engine manufactures use? I have O.S. and GMS engines. Some screws are like m2.4, m2.6, or m3.2. I cant even find any manufactures online that sell those sizes. Lest I be stuck paying $2 a screw from the manufacture. Is it better to retap the engines to a more common screw size? Or learn an expensive lesson and dont buy engines that require exotic parts?

Try 5-40's for the weird 3mm screws. I had the same problem with an old Como and 5-40's worked great. Early OS's used 2.5mm screws that are different, too. I haven't found a replacement for them.

Here's an old thread on the topic:

http://www.rcuniverse.com/forum/m_78...tm.htm#7846200

David

Yes, I agree. My experience with motorcycles tells me that Japanese manufacturers can get by with primarily 10mm and 13mm screw sizes. I can go with 1, 2, 3, 4, 5, 6, mm etc. But why 2.5, 6.5 mm etc. Get real. How about all fine thread? How about dumping the dog gone "Japanese Industrial Standard" Phillips screw driver thing? And, stop the Spanish stuff with the new product manuals. It's English here or go the freak home. Right my Italian, German, French, Russian, Portugese, Japanese, American friends? I've got it, let's go metric fine thread and loose the 5/64, 3/32, 7/64, 9/64, 5/32 etc nonsense. Metric and whole numbers.

Bill

aerofly0610:

You may find some help here:

http://www.boltdepot.com/fastener-in...s/Default.aspx

Regards!

One the old Super Tigers the diameter of the screw was somewhat normal metric but the thread pitch wasn't available anywhere

G'day Bill. I agree. I used to restore old Land Rovers. Series I were all BSF for which you needed Whitworth spanners. Series II came along and the body and engine went to UNF but the rest of the drive train was still BSF. Then came Series III and they left the body, engine and the gearbox the same but added metric to the brakes. AAAAAAAAGH! Three sets of spanners for one vehicle. And the wiring was all Lucas. And I forgot the BA series small nuts and bolts that held small things like the electrical connections. They stayed right through but you could not buy them anywhere.

Q "Why did Lucas make a vacuum cleaner?"

A "Because they wanted to make at least one product which didn't suck."

Q "Why do the British drink warm beer?

A "Because they have Lucas fridges."

Not fair really but they used to get a laugh on the Land Rover restoration boards.

And to get somewhere back near the topic - I have been trying to get a cylinder hold down bolt for a Saito 65. It is a metric 3.5 mm size and of course all the nut and bolt places round here do not have 3.5 mm bolts in high tension cap screw types and I am having problems getting the original spares out of the local agent. I was using a cheap Chinese ball driver to undo the bolt and the head of the ball driver broke off in the head of the bolt. I recently managed to get it out with some fine pliers and a small magnet.

USA cars have been a Duke's mixture of Metric/SAE threads for 30 something years

thanks for the info!

Just pay attention to some of the RCU Advertisers. RTL Fastners is a great source for RC related fastners. They are more than reasonable in their prices.

Anyone know the thread size for the muffler bolts on the old Enya 60 II or III? Driving me nuts (so to speak!). I don't have any old bolts; hard to figure out what's inside those hole. Jim

I went to David's other thread and saw the Cox .049 prop bolt tip - cool! I tried it on the Enya muffler and it was a little wobbly but I could thread it in quite deep - good enough if I use a hose clamp for the band so I can tighten with the hose clamp screw. Jim

Hi!"
DuBro sell 3,5mm Allen head bolts.

G'day

Thanks for that - I will investigate getting some.

JR Hobby Hardware has the odd size metrics mentioned above

http://www.jrhobbyhardware.com/shop/...&cPath=118_121

Old Enya's use some very strange screw sizes. I think they are some japanese only size. I needed head screws for a enya .35III and never did find a correct replacement. In the end, I found someone selling replacement enya engine screw set for $5 and bought it to get this engine running again.

Unless you need to keep your enya original, you might just want to tap the exhaust holes to a common metric size, say 3.5 or 3mm.

I needed an odd size bolt - 2.6 x 25 w/ 0.8 mm thread. My local hobby shop found one that matched in with the suspension parts for the RC trucks.

I lived in another town far away for about three years and they had a very nice Hobby Town. I was always looking in the car section for metric screws.

The Same goes for Tower Hobbies. You may find the screws you want in the car area.

I found airplane servo bearings to be a very common size on car axles

Thanks JimO and RCDude - I think I'll get some of those odd metrics to have on hand, and maybe something will fit the Enya (or maybe the English 5-40 will be the closest I can get). I did try drilling and tapping one of my old Enya mufflers, but it wound up vibrating off. Next time I'll use a hose clamp because they tighten down better than I can do with the screws. Jim