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D7 Not Starting
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BantamRookie30
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February 5, 2020 - 12:31 pm
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Hi All,

First of all, apologies - I understand posts similar to this have been posted numerous times and I have looked through these but can't find a definitive answer that cures the issue.

 

I'm new to the Bantam world, having purchased a 1965 D7 as a gift for a family member. I purchased it from a local motorcycle shop as a running/riding resto and the bike was running quite well at the time I went to view it. Roll on 4-5 weeks and I have had the bike delivered. I knew at the time the battery was pretty old, but I turned it on, tickled the carb and started her up. It ran for about 5 seconds and died. 

I've since tried getting it running again, but it's not having it. I am getting a spark from the plug, but whether it's strong enough when under compression is another matter. The plug is also wet and I did drain the crankcase yesterday having filled it up from all the cranking over. I also drained the tank and replaced the fuel/oil mix with fresh stuff - still no luck.

I will say I am having some fuel drip out the front of the carb when tickling/cranking for a while, which I assume means it could be flooding? (i.e. carb issue). I ordered a new battery and a new plug, which should arrive today, so i'll try those. But do you have any ideas as to what may be the issue? It would be nice to give the bike to him in a running condition.

I have little experience with old 2 strokes, and come from a background of old cars rather than bikes. 

 

Any pointers will be much appreciated.

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Stoo63
GLASGOW
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February 5, 2020 - 1:04 pm
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Hi Rookie and welcome to the Forum, Don't worry, we were all rookies once 🙂

You've already had a look around the forum so you'll already know that there is a mountain of info the FAQs and technical sections. Here, ** Please log in to view **.....ad-photos/

As regards your starting troubles, the first thing that I would do would be to strip and clean the carb - easy job. Might be a sticking float or a bit of dirt somewhere. An inline filter is a good idea. Once it's all nice and clean try it with your new batt and plug and hopefully you'll be in business.

Hope you're up-and -running soon,

Stewart

'52 D1 direct lighting plunger, '58 Square Four (project), '59 D1 direct lighting plunger,  '59 Tiger Cub, '60 5TA,  '76 FS1-E

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cocorico
Central France
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February 5, 2020 - 2:23 pm
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I'd suggest a new battery - or a good recharge of the old one. You are far more likely to get a good spark that way, and it takes one possible problem out of the equation.

1956 D3 running, lights to sort. 7 other bikes in the Barn. 1950 D1 engine being rebuilt (slowly).

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Unitminor
Norfolk
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February 5, 2020 - 4:04 pm
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Just fired up my 65 D7 for the first time this year . It reluctantly started and ran for a few seconds before cutting out it did this 3 or 4 times . So I stripped the carb and blew it out with the air line after that it started and ran ok so I would clean and blow out your carb and see if that helps .

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mikef
Chatham Kent
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February 5, 2020 - 4:53 pm
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Hi BR.
     Firstly it's a 1965. Could be single switched or twin switched (on the headlamp nacelle). Please tell us which.
If it's a single switched, don't worry about the battery, it's magneto ignition. If it's twin switched then a good battery is a must for powering the coil, unless you switch to the emergency start position (if it works), but let's not go there yet.
Mike.

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BantamRookie30
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February 6, 2020 - 7:34 am
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Thanks all - appreciate the replies.

The new battery and a fresh plug arrived yesterday. Drained the crankcase again and kicked it over a few times without the plug. Stuck the new battery & plug in and she fired into life. I am, however interested to know whether the electrical system is charging the battery. Does anyone know what input voltage to the battery should be showing? Thanks

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NeilB
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February 6, 2020 - 9:02 am
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Batteries can have different voltages when fully charged so the easy way to check is multimeter across the battery when the bike is off, then again when the bike is running. With a 12V bike it will be around 12.8V for a good fresh battery, and 14-15V volts when running so I imagine with a 6V system it will be around half that for each value.

As long as there's more voltage at tickover with the headlight on, then the battery will charge, just make sure it does get to 8+V when running or you'll risk blowing bulbs and killing the battery. 

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sunny
Norfolk
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February 6, 2020 - 9:04 am
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the  charge  rate  is  about   6 point   7   with   engie  runing  at  30 MPH  road  speeed    with  a factory  system

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Stoo63
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February 6, 2020 - 9:26 am
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NeilB said
 just make sure it does get to 8+V when running or you'll risk blowing bulbs and killing the battery.   

I think that should read "doesn't" get to 8+V ?

'52 D1 direct lighting plunger, '58 Square Four (project), '59 D1 direct lighting plunger,  '59 Tiger Cub, '60 5TA,  '76 FS1-E

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