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Briggs ladies bike
Posted: Mon Jul 18, 2011 3:03 am
by harry76
Re: Briggs ladies bike
Posted: Mon Jul 18, 2011 11:30 am
by rkelsen
It looks good, but I'm not sure I'd be too keen to hop on it.
How well do lawn mower engines work for this sort of thing? The carbies on them tend to be tuned towards "all or nothing" and (from experience) if you run them without the weight of the cutting arm and blades to govern their speed they will tend to over-rev themselves.
What will you use for a clutch?
Are you sure that a drum brake is adequate?
Isn't the rear wheel sprocket a bit small for an engine capable of 3,500 rpm?
Hopefully, you've already thought of all this.
Sorry to sound like a wet blanket.
Good luck with it.
Re: Briggs ladies bike
Posted: Mon Jul 18, 2011 11:41 am
by harry76
These motors are fantastic for this dort of thing, obviously you need to get the right reduction with the right gearing. MSRFAN from over at motorbicycling.com has thousands of hours on numerous builds that have run trouble free among other builders. So im not the first, and actually this would be a lot more friendly to ride then a chinese 50cc. You know those "junior dragsters" that the little kids drive at the drag strip...... 5hp Briggs and Stratton..... enough said
I have a centrifugal pulley clutch, i still need to build my jackshaft with belt primary and a secondary chaindrive. These clutches are to suit these briggs and other motors
Its a Sturmey Archer front hub which ive heard good reports about and the grubbee hd rear hub with band brake, thats meant to be crappy, if the brakes arent up to it i can buy a disc adaptor to replace the band which is meant to be real good but not very vintage looking
The rear sprocket will be fine with the jackshaft reduction.
And YES ive given this a lot of thought. I appreciate your concern though
Re: Briggs ladies bike
Posted: Mon Jul 18, 2011 11:48 am
by harry76
And im not using the standard carb, i have a mikuni carb to suit
Re: Briggs ladies bike
Posted: Mon Jul 18, 2011 11:57 am
by rkelsen
Wow. I didn't know that this sort of thing was so popular. Looks like a fun project.
All the best!
Re: Briggs ladies bike
Posted: Mon Jul 18, 2011 12:06 pm
by harry76
Thank you.... you should check out motorbicycling.com some time. Theres some pretty amazing builds going on. There are people building old turn of the century board track replica racers such as Indian with motors as big as 6.5hp Honda clones. Ive done most disciplines of cycling with the exception of roadbikes but these things are so much fun to build and ride.
Re: Briggs ladies bike
Posted: Tue Aug 02, 2011 8:24 am
by harry76
Today i did more staring then working.... but i did shorthen the seat stem and seat pole to make the seat a little lower for Kelly.
And i also cut up my shroud. I think its a big improvement in the looks department, looks more vintage, and id guess its better for blowing the air because its now guided rather then before hitting a corner section.
This is the thinnest steel ive tried welding with my welder, i didnt get it to where i was 100% happy because i blew a few holes in it. I just need to neaten it up a little but i had enough for today, so it can wait for now.
Before:
After:
Re: Briggs ladies bike
Posted: Tue Aug 02, 2011 8:28 am
by harry76
I didnt like the angle on the tank so i cut it to match the roundness of the shroud.
Just got a package in the mail (love that feeling)...
Amal throttle assembly... im not a fan of the standard plastic one.
Im happy with the quality, very solid, but they are massive, i think i will chop an inch off the barrell and grips
A comparison with a dual pull lever that i bought but didnt use (dang ugly imo)
Re: Briggs ladies bike
Posted: Tue Aug 02, 2011 8:30 am
by harry76
Im just having a break for lunch and am half way through welding up the tank and i have welded and ground down the exhaust and intake manifold made from old handlebars.
Now its up to Kelly whether she wants them silver or black (she wants them motor silver). I think black would look better. Silver can look cheap sometimes, well it does when i seem to do it lol.
Re: Briggs ladies bike
Posted: Tue Aug 02, 2011 8:32 am
by harry76
Re: Briggs ladies bike
Posted: Tue Aug 02, 2011 8:34 am
by harry76
Today i mostly welded the fuel tank, just need to make the mounting brackets and get some pipe from work for the filler. I also fitted my intake manifold, just need to make a mounting bracket for that. And im currently finishing the exhaust manifold mount and brackets.
I also fitted the seat, and although i love it, the other one seemed to suit the build better, i guess ill wait and see.... what do you guys think?
****Also i noticed the shroud moved in this pic, the shroud and fuel tank line up when bolted on.
Re: Briggs ladies bike
Posted: Tue Aug 02, 2011 8:37 am
by harry76
Re: Briggs ladies bike
Posted: Tue Aug 02, 2011 1:10 pm
by harry76
Re: Briggs ladies bike
Posted: Tue Aug 02, 2011 1:12 pm
by harry76
Re: Briggs ladies bike
Posted: Wed Aug 03, 2011 6:48 pm
by johnfelix
Keep 'em coming
Love this thread
Impressive work
Re: Briggs ladies bike
Posted: Thu Aug 04, 2011 4:53 pm
by harry76
Thanks John
Well ive been hard at it with not much to show. Doing a lot of running around amongst other things. I did get my jackshaft mounted, picked up the 5/8 shaft for this and my pulleys for my Villiers (which i really wanna test ride but trying my hardest to get this ready for Sunday).
I put a slight bend in the toptube to allow room for the jackshaft. I got my muffler mounted, finished my fuel tank and lined it with a tank liner.
I just need to shorten my primary cover as i made it at work (before i went on a break) before i knew the exact length of the primary.
And if all goes well i will be painting tommorrow and hopefully dry by Saturday afternoon to assemble. Itll be some mirale if i can get this done..... ya never know.
Re: Briggs ladies bike
Posted: Thu Aug 04, 2011 4:55 pm
by harry76
Ive built this bike in a hurry (for me anyway) and although i had an idea all along in my head i never really put pen to paper to design it..... anyway i didnt really consider allowing for the motor to move forward on the mounts to tighten the primary belt as it stretches a little, so i may have to make a little tensioner later for it, i dont really have time at the moment.
I have one major drama. I organised a 10 tooth pulley for this bike from a mower shop. When i went and picked it up today they didnt have it but went looking around for me and thought they found one, it was just a little wide so i tried grinding its profile down but the pitch is still wrong. Its the one in the photo.
So im going to have to ring around tomorrow and hopefully someone has one in stock, or the one i have coming from the U.S turns up in the mail tommorrow, im having some bad luck lately..... maybe its that no.13 i put on my Whippet build???
Re: Briggs ladies bike
Posted: Sat Aug 06, 2011 7:36 pm
by harry76
Re: Briggs ladies bike
Posted: Sun Aug 07, 2011 3:59 pm
by harry76
Re: Briggs ladies bike
Posted: Mon Aug 15, 2011 11:48 am
by 18htan
Thats some outstanding work mate.
It really came up a treat! How does it ride? Any vids?