Author Topic: What have you done with your bike/s today?  (Read 166134 times)

Offline RDfella

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Re: What have you done with your bike/s today?
« Reply #1350 on: 23.08. 2020 16:40 »
Panther is a curate's egg for me. Engine is beautiful and those brakes look powerful. But the seat, crude swingarm and line of the exhausts spoil it IMO.
'49 B31, '49 M21, '53 DOT, '58 Flash, '62 Flash special, '00 Firestorm, Weslake sprint bike.

Offline RDfella

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Re: What have you done with your bike/s today?
« Reply #1351 on: 23.08. 2020 20:50 »
Bit more progress on the project today. The Amal Mk2's arrived a couple of weeks ago but haven't fitted them yet as modifications will be required, so the mikunis are still on. No worries, though, as whilst waiting for the Amals I put the bike on the lift to carry out other jobs.
Such as my plan for an automated decompressor. The plan was to fit a timer to the rear cyl camshaft, replacing the daft can't see it in the dark 'kick indicator'. This timer would in turn operate a solenoid acting on the exhaust valve lifter via a relay, thereby halving the compression ratio for starting. Not to be, though, as despite ordering a solenoid purported to be powerful enough (the decompressor needs 8kg pull) it was too big to fit in the space available and, to boot, wasn't powerful enough. So Plan B is to use the timer to operate a light, indicating when the person starting the bike should release the decompressor and give the kickstarter some welly. Now have to fit a 2nd decompression lever to the handlebar. Must start planning the mechanism for an electric starter.
Also on the job list was make a blind nut to stop the oil leak from the gearbox speedo cable fitting. And turn up some black nylon grommets for the headlamp to blank off the ammeter and light switch apertures as the latter hide behind the Suzuki speedometer and rev counter. I've ordered a modern handlebar light switch to replace the standard light switch.
Getting there slowly. Anyone know where one can get motorcycle brake hose and fittings? The off the peg ones I fitted are too long so I'll need to make some to fit properly.

Forgot to add, the bore in the cyl head / cam cover isn't exactly round - .005" oval in fact so I had to turn the alloy housing for the new indicator to the minor dimension and hope that the O ring I allowed for will seal the gap.
'49 B31, '49 M21, '53 DOT, '58 Flash, '62 Flash special, '00 Firestorm, Weslake sprint bike.

Online Worty

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Re: What have you done with your bike/s today?
« Reply #1352 on: 23.08. 2020 21:02 »
You're a bloody clever fella RD, no idea what you're talking about but it sounds mighty impressive *beer* *wink2* *whistle*
Current Bikes😎
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'61 Flash

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'59 BMW R60
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MZ250

Offline Greybeard

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Re: What have you done with your bike/s today?
« Reply #1353 on: 24.08. 2020 11:09 »
Is there a way a small hydraulic ram could used for the decompression lever? Maybe the kickstarter could operate the ram. What about using a brake cylinder as a ram?
Greybeard (Neil)
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A Distinguished Gentleman Riding his 1955 Plunger Golden Flash

Offline RDfella

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Re: What have you done with your bike/s today?
« Reply #1354 on: 24.08. 2020 11:36 »
Hi Neil,
An hyd cylinder could concievably do the job, but it's the timing of the actuation that's crucial to the purpose. What I was trying to replicate is the auto decompression (as used by Honda and others) whereby on the compression stroke the exhaust valve is lifted slightly starting around BDC and closing again around 45* BTDC. That effectively halves the compression ratio for starting. Once the engine is running, their system disengages under the action of flyweights.
I was planning to time the actuation electrically, operating the existing decompressor lever via a solenoid and wire. Just look at the size of that solenoid! But even that wouldn't open the valve. Even considering the leverage ratio of the decompression lever, it still has to compress the valve spring(s) to open the valve and I recorded an 8kg pull on a spring balance when measuring the effort required. Once the valve has been moved (or if it's already open before the lever is actuated) the force required is quite small. But in this application, the lifter has to actually open the valve from closed. I can work around this, but it'll be manual rather than automatic. Time to start designing an electric start for the bike.
I'm off now to fix up the handlebar-mounted rear cylinder decompressor I now need, plus a bit of wiring loom construction.
'49 B31, '49 M21, '53 DOT, '58 Flash, '62 Flash special, '00 Firestorm, Weslake sprint bike.

Offline Greybeard

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Re: What have you done with your bike/s today?
« Reply #1355 on: 24.08. 2020 12:15 »
Maybe a crude solution: what about a trigger arrangement? You manually lock the decomp open before kicking. When the engine starts, an automatic trigger releases the valve.

Update:

Reading what I wrote again, I don't see an advantage over holding the decomp lever during starting, in the old fashioned way. There must be good reason why you cannot do that.

Greybeard (Neil)
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A Distinguished Gentleman Riding his 1955 Plunger Golden Flash

Offline RichardL

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Re: What have you done with your bike/s today?
« Reply #1356 on: 24.08. 2020 13:08 »
It's 7:05 AM, Monday, so nothing physical. Amusement-wise, I'm reading forum posts and have this question: Is "What have you done with your bike today?" really the place for exhaustive technical discussions?

Richard L.

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Re: What have you done with your bike/s today?
« Reply #1357 on: 24.08. 2020 13:24 »
Probably not Richard, but I'm sure admin will allow for a bit of 'topic drift'. *fight*  I guess it is what people are doing with their bikes *dunno* *dunno* *work*
Current Bikes😎
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'61 Flash

Past Bikes👍
'49 B31
'59 BMW R60
Yam FS1-E, YB100, RS100, RD200DX,250DX,350B, XS750
MZ250

Offline RichardL

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Re: What have you done with your bike/s today?
« Reply #1358 on: 24.08. 2020 14:08 »
...and maybe not the place for this discussion, either. I'm moving taking it to a different board.

Richard L.

Offline Butch (cb)

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Re: What have you done with your bike/s today?
« Reply #1359 on: 24.08. 2020 16:23 »
Gearbox for the Guzzi V50 came back in the post on Saturday. A quick check revealed it now had a full set of gears, but despite having a new neutral light switch that still wasn't functional. Bolted it all back together anyway, it will have to do for now. Had it running and stuck some VED on it, but didn't get round to riding it off the plot.

Sunday, with the lifting table now free again, I finished servicing my pals little Serow - Digger.
Warning - observations made by this member have a 93% unreliability rating.

Of Bikes; various, including ...
'58 S/Arm Iron Head Flash Bitza


Offline RDfella

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Re: What have you done with your bike/s today?
« Reply #1360 on: 24.08. 2020 19:09 »
Holding the valve open over the firing stroke wouldn't work Neil.
But I note others aren't interested in what I've been doing with my bikes, despite this particular section dealing with exactly that. Maybe it's above some people's heads, but I thought it would be interesting. Obviously not, so I'll stop posting about it. Maybe stop posting altogether would be an idea too.
'49 B31, '49 M21, '53 DOT, '58 Flash, '62 Flash special, '00 Firestorm, Weslake sprint bike.

Online berger

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Re: What have you done with your bike/s today?
« Reply #1361 on: 24.08. 2020 19:26 »
today I went on a very slow doodle on some very narrow overgrown roads i used to ride on when i was a yoof. once i had got some of the memories over and done with it was time for a betsy blast *woo*. there are some nice little places in Derbyshire and i visited ashover ,matlock--big mistake mad with traffic, youlgreave, Middleton, monyash, lathkill dale, Stanton in peak, over haddon, ashford in the water, Bakewell and baslow. these types of places really need to be done as a pillion so you can have a good nosey around. it was only about a 3/1/2 hour run but by eck i knew about it when i got home. i might consider taking the clip ons off when i get old *doubt*

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Re: What have you done with your bike/s today?
« Reply #1362 on: 24.08. 2020 19:27 »
RD mate, if I can speak for myself - I am interested in what you're doing with your bikes, it's just that it's over my head.  There are many who are far more intelligent and skilled than me who would benefit from the engineering puzzles you're working on and trying to solve.  Just because I'm a bit thick shouldn't disadvantage others who can appreciate what you're doing more fully.  Your posts will be invaluable to those with the same issues. *smile*
Current Bikes😎
Kwaka W650
'61 Flash

Past Bikes👍
'49 B31
'59 BMW R60
Yam FS1-E, YB100, RS100, RD200DX,250DX,350B, XS750
MZ250

Online BigJim

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Re: What have you done with your bike/s today?
« Reply #1363 on: 24.08. 2020 19:33 »
Go steady RD and take a breath. Lots of people i'm sure are following your posts with great interest. I personally am v keen to see and hear the beast start up one day even tho the technicals go way beyond my understanding. The ideal might be for it to have its own topic title like RD's project. I not bothered whatever/wherever so long as we get to see the beast run and your smiling face as you ride it down the road on your way to the Isle of Man or wherever your fancy takes you.
Jamie,  Supporter of Distinguished Gentleman's Ride

Online berger

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Re: What have you done with your bike/s today?
« Reply #1364 on: 24.08. 2020 19:33 »
RD i'm with wortluck on this one. "your a bloody clever fella " but alas it's over my head by a mile the sort of thing you are doing with that bike. i wish you all the best regarding getting a result *beer*