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B175 sluggish running. Carb?
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HDBIKER
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February 27, 2021 - 5:31 pm
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Hi. New to the forum, but not to bikes!

Just an additional query. I have a B175, 1970, bored to 185, George Todd head, new carb, electronic ignition, etc. I see one of the members had a similar problem as myself. Starts well. Carb happiest at 3/4 of a turn out. Struggles a bit when running. A bit of choke helps, but bike doesn't pick up and rev freely. Carb is a new Anal 626/302. Have increase Main jet to 190. Helped a bit. Someone said carb should be 626/17. Does this make a major difference. Any ideas someone?

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Stoo63
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February 27, 2021 - 8:40 pm
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HI Chris and welcome to the Forum. Sounds like a tasty bike you've got.

You will find just about everything you could ever want on the Forum via the FAQs and technical sections;  ** Please log in to view **

Have a really good nose around the forum and enjoy yourself. Looking forward to seeing your progress.

Good Luck!

All the best,

Stewarrt

 '55 D3 Battery; '58 Square Four (project); '59 D1 direct lighting plunger; '59 Tiger Cub; '60 5TA;  '76 FS1-E; '91 GTR 1000;  '97 Honda Sky SGX50.

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FitzFortune
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February 27, 2021 - 11:28 pm
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You've got the wrong carb alright.

Take a look at this thread: ** Please log in to view **

By the way, having avoided the obvious joke with respect to the typo in your original post I am now very pleased with my self-restraint!clap

 - Ian (aka Fitz)

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mike p5xbx
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February 27, 2021 - 11:37 pm
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aMal 626 carbs are all mostly the same but with different jetting as below, so not the wrong Carb but
"bored to 185, George Todd head" complicates getting the jetting correct

626/17 has

3.5 Cutaway Slide

180 Main Jet

105 Needle Jet
and fixed pilot jet

626/302 has
3 Cutaway Slide

170 Main Jet

106 Needle Jet

25 Pilot Jet

D? - D10- D14 Bantams 350 AJS -500 Triumph http://bsanotru.....lfire.com/

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HDBIKER
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February 27, 2021 - 11:44 pm
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Thanks for info guys. Typo?

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FitzFortune
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February 27, 2021 - 11:50 pm
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This typo...

HDBIKER said
...Carb is a new Anal 626/302...

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HDBIKER
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February 28, 2021 - 7:28 am
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Predictive text!! List of /17 parts really helpful. Amazing that a few minor parts can make such a (hopeful) difference! Not sure why the last owner didn't fit the right one, although he bought it from a dealer rather than Amal. (note spelling!!) Should be interchangeable as the carb body is the same. Will chat with Burlen on Monday. Cheers.

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FitzFortune
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February 28, 2021 - 8:01 am
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Chatting to Burlen is always the right thing to do with regard to Amals.

You might want to think about also getting a viton-tipped float needle from them and maybe a stay-up float, if your carb doesn't already have them.

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cocorico
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February 28, 2021 - 8:04 am
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HDBIKER said
Hi. New to the forum...Carb is a new Anal 626/302...

We tend to have a somewhat schoolboyish sense of humour when the opportunity arises. You are not the first, BTW.  wink

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HDBIKER
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February 28, 2021 - 8:35 am
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Thanks for the float tip. The carb has both. Due to the bigger bore and GT head, I may have to jet up a bit. Burlen suggested a 190 main, leave the needle jet and up the pilot to a 30. This was before I investigated on the forum. Will re-strip carb today and check all the bits.

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HDBIKER
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February 28, 2021 - 11:06 am
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Hello (again). Can someone give an idea for a fixed pilot jet for 626/17 spec carb. They seem to start at size 15 upwards. Thanks.

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HDBIKER
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February 28, 2021 - 12:27 pm
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Hi. Stripped carb. 4 stroke needle, 30 Pilot jet, 180 Main, 106 Needle jet, 3 Slide. 

So, should be 105 N jet, Fixed? Pilot Jet, and 3.5 Slide. Should these first items make for sluggish running? Certainly struggles to pick up and rev freely.

Cheers.

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mike p5xbx
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February 28, 2021 - 4:53 pm
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fixed jet is only on the B175 626/17 carb
they can be more trouble, cant be altered and easily blocked and very hard to clean hence the mod in the photo below

amalmage1A.jpg

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D? - D10- D14 Bantams 350 AJS -500 Triumph http://bsanotru.....lfire.com/

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Stoo63
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February 28, 2021 - 10:28 pm
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Lucky you, Chris. Upgrading from Glesga to the East Neuk 🙂 I'm originally fae Newport-On-Tay myself but, for my sins, have ended up in Possil 😖

 '55 D3 Battery; '58 Square Four (project); '59 D1 direct lighting plunger; '59 Tiger Cub; '60 5TA;  '76 FS1-E; '91 GTR 1000;  '97 Honda Sky SGX50.

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BantamBaz
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February 28, 2021 - 10:54 pm
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Would agree with Mike about modding the carb. 

I did mine recently & it's  made a lot difference, good to be able to SEE the jet is clear.

The screw thread is either 3/16 bsf or 2 ba. Drilled mine out 4mm & tapped 3/16. 

Barrie 

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cocorico
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March 1, 2021 - 7:41 am
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BantamBaz said
...The screw thread is either 3/16 bsf or 2 ba. Drilled mine out 4mm & tapped 3/16...

For some reason that amused me enormously, thank you. tip-my-hat

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BantamBaz
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March 2, 2021 - 10:39 pm
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It made sense to me at the time Coco !

The darned thing disgraced itself today though. Since I did the carb mod it has been starting first kick, I was really chuffed .

I'd  not started it for a few days & thought I'd give it a kick, away it went first kick but wouldn't rev.

Only conclusion I've  come to is that I hadn't  run the float chamber out & the ethanol fuel had evaporated just leaving an access of oil.

I'll  see when I try again.

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mike p5xbx
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March 2, 2021 - 11:04 pm
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BantamBaz said
I'd  not started it for a few days & thought I'd give it a kick, away it went first kick but wouldn't rev.
  

funny enough that is the symptom of a blocked pilot jet
(more so on the 375 Carb my AJS is constantly doing that) laugh

D? - D10- D14 Bantams 350 AJS -500 Triumph http://bsanotru.....lfire.com/

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cocorico
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March 3, 2021 - 8:12 am
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BantamBaz said
It made sense to me at the time Coco ...

That's the thing - it's perfectly understandable!

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HDBIKER
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March 7, 2021 - 9:36 am
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Hi. Quick update. 3 1/2 Slide fitted, 105 Needle jet as well. Picks up far better. A bit sluggish low down, but revs a lot better. Needle in second groove. Another query- gearbox selects well, but a bit reluctant finding second and first when moving on down changes;  not bad at standstill. Oil level fine.

Cheers.

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