SR2 rebuild, no fuel to piston

[Honkeyboy]

Hi again Norbert and thanks for the reply, yes a 250 may would end up with the madhouse lol this is the pic of the engine after yesterday

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[Honkeyboy]

I think a lot of the problem at the moment is that when i tighten the carb the studs are being pulled at an angle and therefore breaking the weld (see Pic). although the weld i purchased from motosave i don't think is very good so i have bought a really good one and am waiting for it to arrive. then i am going to have 1 more attempt and re drill and set it again and maybe use my mini cutting disk to try to flatten the carb side where the studs tighten.

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[Honkeyboy]

P.s thank you for the link about the carbs it was really informative also the walbro carb i have coming has a bore size of 9mm this could be ported out to 12mm? the reason i have come up with the walbro thinking is that i came across a video of some young boys in germany do this with an NSU Quickly re: https://www.youtube.com/watch?v=Mn7tt-Jjgt8 would this work? and what would be the pro's/cons would you think?

[NorbertE]

Thanks for the pictures, I thinked so.

The reason why of bended angels of the carb is fixing this to hard. Many of carbs looking so. Its aluminium and underneeth the carb is a plastic disc. In the original internal describtion the simson boys write "a little bit more than hand fixed"

Now you need a new 5mm hole with a 6mm winding. This is`nt on this place possibil with a machine. I cutted there with 2 cuts with the dremel and a minicutter a slot, removed the old bold and put a new one in. Than 2-component aluminium fluid or knead metal into and it works till today.
Try it, I´m shure it works also at your engine.

And yes, you can try to make the "ears" from the carb a little bit flat.

A carb with 9mm bore size is`nt enough for the SR2 engine. It works at a quikly, yeah, but the quickly is a west german moped. Nothing of power.

[SR2_Berlin]

hi Honkeyboy,
i looked closer at your first pic and i think you hadn't mounted the plastic ring Norbert mentioned already between carb and cylinder. you need this disk and two (!) gaskets before and behind the ring, otherwise it will have air leaks between carb and cylinder.
drill the stud hole and cut a new thread? or is the material already too thin?

If you live near Munster in Germany you had something to do with the military, don't you?

greets,
Victor

[Honkeyboy]

Hi again Victor and Norbert today's update :

Victor yes was stationed there in 86 but spent all my free time with the Blue Angels MC in Essen and watching Dortmund play football

yes when i had the carb fitted i used gaskets and a spacer but i had to manufacture a spacer out of aluminium as the original was broken although it was only 3mm thick would this make a difference? (see pic) the hole that was drilled is too big for a 6mm thread and so i am having to try to cold weld it in (still waiting for the new cold weld to be delivered) Mark

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[Honkeyboy]

Norbert i have flattened the carb ears now and it seems to be a better fitting and i had already cut a 6mm bold down as a stud and am now waiting on the better cold weld. but then as usual with me (crisis time) the float fell apart as you can see in the pic. So out with the torch and slodered it back together

I now have the float adjusted and refitted and yay no leaks how well it will work however is to be seen. and yes i have ordered the 2 part weld as i think it will be a stronger bond. meanwhile im shopping for a new gasket set and spacer.

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[Honkeyboy]

The repaired float

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[Honkeyboy]

And the carb re-assembled with the ears flattened

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[Honkeyboy]

And have just manufactured the new head stud ready to cold weld into the barrel i have cut notches into the end to be welded to aid with the bonding. I LOVE MY DREMEL

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[NorbertE]

When you have repair the head stud you can try to start the engine. It must run for a few minutes also with the aluminium spacer till the cylinder become (become or get? ) warm. Must run.

[Honkeyboy]

Hi Norbert, ok will clean out the hole and try that (fingers crossed)
Ahh the English fun words lol ok

As I get older I get more optimistic.

As I become older I become more optimistic.

both can be used

[NorbertE]

Thanks for help in english grammar, its long years ago (let me calculate...45 )

Yes, try it and I`m waiting for success.

[Honkeyboy]

Norbert you need no help with your grammar you would only have to listen to most of the kids here nowadays to see that yours is much better than most lol.
45 years wow, well saying that it's 30 years since i was in Germany ( time fly's ) well the JB weld turned up yesterday and i have now welded in the new stud and it is solid. i reassembled the carb and it is nice and tight, when i did so i noticed that the previous owner has skimmed a little off one side of the inlet manifold at the engine ans so it is not 12mm (maybe this is the problem?) more like 16mm but still 12mm on the carb i reassembled it all anyway but still no joy. i primed the head and it started but ran only for a few seconds (still no fuel from the carb) altho the fuel is now going into the carb ok with no leaks.so i am now looking for a replacement engine and maybe a replacement carb also. i could then keep the other parts on the shelf for spares, ive seen a few engines etc on ebay.de but most of the guys don't seem to want to post to the UK. so i will keep looking. untilll then its the NSU which ive now got tuned up to around neally 60 kph

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[NorbertE]

I can see your picture one of this site two and I don`t think you have a bigger input on your carb. But its not so important.
If you have now fuel into the carburator (control this. You must have a level of fuel into the tub of the carb. Always!) the engine must run. Control the ignition spark on the plug. Must be "blue", not a little yellow fucking thing. The correct ignition time is 2,5mm before High point of piston. You can be measure with a watch, a piece of wood, with a nail.
If this all correct and the machine don`t want to run, try it with a little helper named starter spray. Into the air filter.

This little engine and the carburator is very easy constructed, but in the little fineness you can find any of problems. Try it continue. A new one can everybody.