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Willy Duwit's 1966 d7 super
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Willy Duwit
North Somerset
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October 25, 2018 - 2:02 pm
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Hello,

I trying to get my bike going after not running for 25years. Had a good spark but the white wire in the rectifier just broke.

This was my grandads bike. He bought it new. He traded in a b31 according to the receipt .

It was in my mum's name but I can't find the log book.

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nickjaxe
Runcorn Cheshire UK
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October 30, 2018 - 10:54 pm
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Good luck with it.

Dont forget...join this club get 10% discount on your Rex Caunt parts...and free access to all the manuals parts books ect.

My Bantam video              https://www.you.....jpOFmzRZRI

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Willy Duwit
North Somerset
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October 30, 2018 - 11:57 pm
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Well, I can't quite believe it. I cleaned the carb (twice), still leaking. Just ordered a gasket set. Made the one for the float cover. That worked, third time lucky. 

Soldered the fuel tap filters back on.

The wiring needs sorting but with a bit of throttle it fired up. 

It won't rev but I am over the moon. I started to feel what carbon monoxide poisoning must be like. I must open the garage doors a lot wider next time. 

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b175er
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November 2, 2018 - 7:27 pm
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To get it to rev - if it's one with the points on the left hand (rear chain) side of the engine - it might be worth turning the points holder whilst someone holds the throttle open. This advice was given to me many years ago and it worked then. Ken.

two B175s and a CB360

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Willy Duwit
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November 10, 2018 - 12:42 am
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By way of an update, I fitted the new gasket set on the carb. No more leaks. The bike would not start. It had blackened fuel coming out of the silencer joint. Read some old threads and found the drain bolt. Loads of fuel came out (15ml ish). I heated the plug and it fired but would not start. No time to play for a few days but today I started it by heating the plug and it ran for about ten minutes but still would not rev. I tried adjusting the timing but it had no affect. For a few seconds it revved correctly then would not rev. Now it won't start. Still tons of other stuff to do though. Joined the club also.

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nickjaxe
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November 10, 2018 - 10:27 am
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I would put my shirt on it being fuel.

So when it starts does it just run at idle speed with no response from the throttle?

You 100% sure the carb is assembled correctly.

Nick.

My Bantam video              https://www.you.....jpOFmzRZRI

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Willy Duwit
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November 10, 2018 - 12:00 pm
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It runs as you describe, throttle has no affect. I stripped and refitted the carb as per the owners manual. The jets are all as per the spec sheet. It is over twenty years since i played with 2 strokes and as mentioned i was surprised how much fuel came out of the crankcase drain plug (never had to do so on my DT125LC). It revved for about two seconds and sounded great, bringing back lots of memories. 

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johnsullivan
east sussex
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November 10, 2018 - 12:09 pm
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Do not forget the air lever is not intuitive it points towards you off.

67 D10. and a D7    2007 Honda Hornet FA. Suzuki 89  DR 250S, Sinnis SC 125. 78 Honda 90  75 Montesa Cota 247

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nickjaxe
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November 10, 2018 - 2:00 pm
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With the airfilter off if you open the throttle fully...can you see the slide go fully up?

My Bantam video              https://www.you.....jpOFmzRZRI

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Willy Duwit
North Somerset
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November 10, 2018 - 3:39 pm
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The slide goes up with the throttle. I'm wondering if there are passage ways I missed when cleaning the carb. If so what is best for cleaning them out. 

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johnsullivan
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November 10, 2018 - 4:31 pm
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 Ah but is the needle? Been there got the humiliation.

67 D10. and a D7    2007 Honda Hornet FA. Suzuki 89  DR 250S, Sinnis SC 125. 78 Honda 90  75 Montesa Cota 247

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nickjaxe
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November 10, 2018 - 6:17 pm
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Yes with the needle.

My Bantam video              https://www.you.....jpOFmzRZRI

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thornebt
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November 10, 2018 - 6:36 pm
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I know much less about Bantams than most people on this forum but if the bike has not been run for 25 years then the problem might be that the crankshaft oil seals are shot resulting in low crankcase compression.  It's just an idea.

Cheers.  Bruce.

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cocorico
Central France
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November 10, 2018 - 7:23 pm
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thornebt said
I know much less about Bantams than most people on this forum but if the bike has not been run for 25 years then the problem might be that the crankshaft oil seals are shot resulting in low crankcase compression.  It's just an idea.

Cheers.  Bruce.  

i-agree 

As far as fuel goes, as long as it's not what's been in the tank for 25 years, fuel mix lasts for months - in fact I've never had a problem using 'old' fuel mix.

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Willy Duwit
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November 10, 2018 - 10:00 pm
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It's new fuel. How much crank pressure is required and how do you test it. 

It only has a small air filter and strangler. I don't ever remember it having an air lever although their was a threaded hole in the top of the carb, now filled with the small bolt.

Next play time is Monday morning so lots to try.

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nickjaxe
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November 10, 2018 - 10:56 pm
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First check...that the needle goes up when the slide does...its fixed to the slide.

My Bantam video              https://www.you.....jpOFmzRZRI

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johnsullivan
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November 10, 2018 - 11:00 pm
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{If it starts then the crank pressure will be ok 99 out of a 100}.Start the bike if poss in the dark.Watch for arcing off the HT lead .Let the bike warm through at its idle.stop it after a bit and drain the crankcase .If you have any residue then we can assume we are rich .lean off the mixture screw.repeat .I occurs to me that it it might be an idea to watch the points too for excessive sparking:and starting without air cleaner may be revealing.I have said before do not despair it is all in the game ,but Bantams are intrinsically good starters unlike some other machines.What happens with the needle is when you pop the retainer clip in it does not go home properly and is 'spread' causing the needle to fall out

67 D10. and a D7    2007 Honda Hornet FA. Suzuki 89  DR 250S, Sinnis SC 125. 78 Honda 90  75 Montesa Cota 247

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Willy Duwit
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November 12, 2018 - 9:23 pm
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So, i checked the carb, the slider and needle moving all the way up, changing the needle height made no difference. I dismantled the carb and it was nice and clean. There is no sparking at the points. I took the drain plug out briefly and there was lots of pressure. Nice flow of fuel. Also adjusting the timing made little difference to running, still won't rev. Tries to die the second the throttle is opened but will tick over.

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nickjaxe
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November 12, 2018 - 10:10 pm
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Mmmm...next time a second before you open the throttle press and keep pressed the tickler if it revs let it go.

What size main jet has it...the main jet is in place isn't it...if it were missing and you didn't notice you would never know.

Without it...it will suck up neat fuel as soon as you open the throttle.

Try the tickler first.

Just a thought.

My Bantam video              https://www.you.....jpOFmzRZRI

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johnsullivan
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November 12, 2018 - 10:27 pm
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Mmmm suspect the coil or the rectifier since you may have a really high res somewhere.

67 D10. and a D7    2007 Honda Hornet FA. Suzuki 89  DR 250S, Sinnis SC 125. 78 Honda 90  75 Montesa Cota 247

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