Author Topic: B25 with Hiccups  (Read 631 times)

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ramwing7

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B25 with Hiccups
« on: 14 July, 2019, 15:41:43 »
I have a 1969 BSA B25 that starts fine, idles fine, and accelerates with gusto.
The problem is when I try to go along at steady throttle at about 30 mph.
It then hiccups and jerks like the world's worst chain snatch.
I'm guessing carburetor, but don't know exactly where to start.

Anyone have any suggestions?

Thanks.

royblackburn1@btinternet.

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Re: B25 with Hiccups
« Reply #1 on: 14 July, 2019, 18:54:18 »
Just a thought could it be condenser breaking down had the same problem on a old Fiesta

Joncheetham

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Re: B25 with Hiccups
« Reply #2 on: 15 July, 2019, 16:56:27 »
If it is of any comfort my 69 Starfire is behaving exactly as you describe, I am looking at points gap and how advanced or regarded the timing is. I will be getting my specs out as my sight ainít what it used to be.

MGILBERT

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Re: B25 with Hiccups
« Reply #3 on: 15 July, 2019, 18:35:46 »
i had a similiar problem with my b25, albeit at 50 mph.  check your condensor connections. mine had vibrated loose. bfn mike

Mike Farmer

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Re: B25 with Hiccups
« Reply #4 on: 15 July, 2019, 20:00:21 »
 :) :)

Sounds like it could be timing. You could try closing the points a couple of thou. Might help

Mike 8) 8) 8)

Joncheetham

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Re: B25 with Hiccups
« Reply #5 on: 16 July, 2019, 22:13:34 »
I think electronic ignition is the top of my shopping list at Kempton this weekend!

royblackburn1@btinternet.

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Re: B25 with Hiccups
« Reply #6 on: 17 July, 2019, 12:32:31 »
Try a new condenser first, it's a lot cheaper.

Bees

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Re: B25 with Hiccups
« Reply #7 on: 17 July, 2019, 20:24:37 »
If you do go for electronic ignition I can recommend the Wassel one. Easy to fit. Good instructions. Good quality.

 Had one on my Starfire for 5 years and haven't  had to touch it since the day I fitted it. It has never misses a beat. Starts 1st or 2nd kick. Good value. I think you can still get it fir about £ 75

Joncheetham

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Re: B25 with Hiccups
« Reply #8 on: 18 July, 2019, 08:50:07 »
To be honest it has been my intention to go for electronic ignition, I have fitted them to my my D3 Bantam and it now starts like a Jap bike. I have done the same with my Kawasaki Z1 as well.

ROBT

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Re: B25 with Hiccups
« Reply #9 on: 18 July, 2019, 09:26:39 »
If you do go for electronic ignition I can recommend the Wassel one. Easy to fit. Good instructions. Good quality.

 Had one on my Starfire for 5 years and haven't  had to touch it since the day I fitted it. It has never misses a beat. Starts 1st or 2nd kick. Good value. I think you can still get it fir about £ 75

I second this advice, I've fitted a Wassel to my Victor with great results. (The control box fits nicely between the webs of the frame at the steering tube/ top tube junction)

B Murphy

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Re: B25 with Hiccups
« Reply #10 on: 18 July, 2019, 14:46:47 »
Do Wassel sell them for a C15 6v distributor model.

B Murphy

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Re: B25 with Hiccups
« Reply #11 on: 19 July, 2019, 19:30:51 »
I'm guessing they don't then!

Joncheetham

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Re: B25 with Hiccups
« Reply #12 on: 19 July, 2019, 21:57:30 »
I'm guessing they don't then!
It may be worth typing C15 electronic ignition into EBay and seeing what it comes up with.

chaz

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Re: B25 with Hiccups
« Reply #13 on: 19 July, 2019, 22:28:18 »
WW61495

 Click for Larger Image   ELECTRONIC IGNITION SYSTEM - WASSELL MICRO-MK1

Wassell 12V Electronic Ignition System for Twin and Single cylinder unit models with side points. Can also be used with Wassell Dist/Mag body WW61489 to replace K1F/K2F Magnetos. European manufactured exclusively for Wassell using premium quality components, with a unique billet stator plate design (CNC manufactured stator/trigger). No fragile pick up coils or exposed soldered joints which are often easily damaged. Our stator plates have all component parts fully encapsulated in resin to avoid these issues.

Super compact module design for easy mounting, also incorporates multi pin wiring connectors, so the ignition pack can be removed from your wiring loom for maintenance.
Avoid carrying dual stocks, as our Kit is designed for single cylinder and twin cylinder applications.

Supplied boxed and with full installation instructions.
Made in Europe!

AdrianS

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Re: B25 with Hiccups
« Reply #14 on: 20 July, 2019, 09:34:21 »
Don't think Wassell do a suitable kit as I looked in the past.
There is one available - I think it may be Boyer but a voltage regulator also needs to be fitted.
Look at the Feked site.