Blood, Sweat, and Beers

[Aint_no_bugs]

Really nice transition, I can't wait to see the next phases. I've just started the same process myself with a '77 and have a similar plan. I really like the seat that you've got on there, did you buy it or is it custom made?

[NotSoLilCrippseys]

Hey! Bike of the Month. Nice work.

[audiojunkie]

Thanks all on BOTM! That was a suprise, since I was logging on quick to review how another member had done up their throttle, and was greeted to my own bike on the welcome page.

Really nice transition, I can't wait to see the next phases. I've just started the same process myself with a '77 and have a similar plan. I really like the seat that you've got on there, did you buy it or is it custom made?

Bought, I forget the online shop now since it was years ago, but they had a bunch of options made in Vietnam. It's a bit hard, and I had to modify the brackets because build quality could have been better, so holes didn't line up. But leather itself has held up well.

I secured my Weber carbs. I discuss it some in another thread I'll edit a link into here with, but they are Italian made off a Alfa Romeo 33, early 90's. They are IDF 40's, but really weird. Features of a IDF 36 and IDF44 at the same time. They were in decent condition, but I stripped and cleaned them anyway.
Edit: link: https://ngwclub.com/forum/viewtopic.php?f=47&t=77960

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Carb dipped, before and after:

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My parts management might give some anxiety

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[audiojunkie]

Took a few trips to hardware store and ServoCity online store, but I have the carbs themselves substantially together. Need to paint manifold still, make the cross brace, and hardware for throttle mounting. Going with a twin-pull throttle from Domino Racing. Waiting for it to be above freezing to do much more, because most that is left requires the actual bike.

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I forget who, but I need to reference their build to see what they did about a throttle cable support bracket, but I really liked their method. Didn't remember how they got their throttle set adjuster contacted, but I managed to throw some pieces together:

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[Fred Camper]

Several members documented their weber build. Look for White Trash by Greg F and 77 Wing Forever Bike by wannabridin.

[Rat]

Then there’s HOTT

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Gord

[Gowing]

Excellent BOM.

[audiojunkie]

OK, the north country finally decided to get above freezing today, so got back to work.Trying to sort out the fuel pump mount. I'm using the cross-brace even through I'm going the dual pull throttle route, mainly to mount brackets for the cable stops (and because cyclical tension on the carbs sitting that high worries me for long-term sealing of the intake manifolds).

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Honestly, think it looks pretty good, considering all I have is a right angle grinder and a dremel to work with.

What my concern now is, is that the pump is mounted too high. It's below the petcock, but not below the bottom of the tank. If I'm remembering my fluid mechanics correctly, I risk a lack of fuel delivery after I get below half a tank, based on where it's currently mounted:

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The vertical location of my currently is very similar to Milwright's and I didn't see him not issues with it.
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[Fred Camper]

Looks like it will work well with your Webber carbs. Make sure you can access the fuel filter without much hassle but suspect you will do fine.

[audiojunkie]

Looks like it will work well with your Webber carbs. Make sure you can access the fuel filter without much hassle but suspect you will do fine.

Yeah, that's what the second picture originally was, a "whoops, didn't estimate that one quite right". Going to the hardware store today to get a brass 90 degree elbow.

If I do start running into the issue of losing gas flow at a half tank, I think I can drill out the rivets and reverse the angles so it mounts lower, but would need to drill out a large hole in the bracket to run the fuel line through it.

[audiojunkie]

Long absence, but that's because I was either busy working on the bike, riding the bike, or traveling in most of my free time. I swore I had way more pictures to add, but not finding them. Will have to get some better update photos.

Update:
Pulled existing coils and noticed a crack, and some putty. Previous owner must have been trying to keep the Electrical Smoke in. Changed over to the Neon ignition coils, and made my own spark plug cables from Ton's Performance. Nice braided cable available. Went with resistor plugs, since changing the caps got rid of the resistor in-line. Was able to cut and drill some small pieces of steel angle to use the original mounting brackets and keep a good ground for the coil.

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Painted the intake manifolds, installed and she started right up. Ran like a Harley, since they weren't synced yet. At first wasn't able to get it to idle, but noticed it would die immediately when I plugged the air holes on one of the carb banks, but not the other. There ended up being an issue with one of the bypass screws not seating fully and it wouldn't sync. Pulled the carb, carefully tapped the hole, and it was behaving better.

I'll get a couple videos linked once they are ready on youtube.

[Fred Camper]

Good progress for sure, one rain and your old coil would have put you at 50 mph max. Nice you found it first.

[rcmatt007]

Good progress for sure, one rain and your old coil would have put you at 50 mph max. Nice you found it first.

isn't it fun to run on two cylinders

[audiojunkie]

Good progress for sure, one rain and your old coil would have put you at 50 mph max. Nice you found it first.

isn't it fun to run on two cylinders

Considering it can be hard to tell you're only running on three, at least you know it for sure on two.
I didn't attach the picture I took after I couldn't figure out why it seemed to be running a little poorly, and then noticed from the side that one of the plug cables wasn't attached.

[audiojunkie]

First start went well enough, considering it was a rough bench sync, and I think I hadn't yet fully fabricated the throttle system yet. Was having a hard time getting it to idle at a reasonable RPM, and basically had to cheat the throttle slightly open for it to stay running. I was also dealing with really hard starts if I had ridden it a while and then let it sit for a few hours. Also smelled REALLY gassy.

When I ended up figuring out is I had two issues:

• Fuel pump was delivering a bit too much pressure, which showed up most with it running best for the first mile or so, and a flooding issue once shut off (since the lines would be heated by the engine and force expanding gas past the float needles)

• Jetting was close, but wrong. Idle was too big, and so was the main. Ordered 4 different sets of each (2 sets each of mains for alternate main venturi sizes)

I still need to dial in the idle, probably taking it a step or two smaller.
Still working on finding a fuel pressure regulator, but in the meantime installed an aux switch for the fuel pump so I could shut it off just before I get to my destination so there isn't extra pressure just sitting in the lines.

Latest picture from one of my last rides of the season; finally got some rain hats, and luckily had them since I caught a decent storm on the way home.

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Video of the first start up after carbs were installed. Hadn't yet synced, and I don't think I had any throttle mechanism installed, so was actuating each by hand:


And bonus video of a near end of season ride. Got an Insta360 X3. Great motorcycle dash cam, though a little less than impressed with the resolution: