|
|
Post by phoebeisis on Oct 25, 2008 15:16:45 GMT -5
I'm 57 yo. I can still 1st kick start my SR500, but I'm not getting any younger.
I know there isn't any practical way to retrofit an electric starter to the SR.
However it has occurred to me that one of those electric torque wrenches might make a suitable substitute. I could carry it on my rack/carrier. I could cut a hole in the flywheel cover( cobble together some sort of pop off pop on cover), and use the torque wrench to spin that nut that holds the flywheel on.
This is just a rough idea of course. If the wrench isn't geared low enough it won't work. I think I could probably hook up a gadget to hold the compression release on for a couple of turns,and them suddenly release it once a little momentum has been built up.
What do you think? I'll try to see if my 18 volt Dewalt drill set on slow speed will turn the SR500. It makes no great claims on Torque,so I doubt it will work.
Thanks,
Charlie
PS- I just spun it a bit with the 18 volt drill. It can spin it with the compression release pulled, but withy full compression it can't budge it.It did kinda "pop" when I dropped the compression release,so it might work.
Of course,as soon as I put the drill on-19mm nut- I released I would need some sort of freewheel device so when it started , it didn't break my arm with the drill. Any ideas on that? It would also tend to unscrew the nut, but it is on pretty 'hard". That, spinning the nut off, could be the biggest problem.
Plan B might be to spin the rear wheel with the torque wrench -on centerstand- and drop the clutch in 3 gear once it is spinning as fast as possible-same problem getting the drill to not break my arm of course, but I could pull it off before dropping the clutch.
|
|
|
|
Post by sjef on Oct 25, 2008 18:14:18 GMT -5
Hallo,
reminds me of starting my old nissan with a socketwrench on the crankshaftpulley. never hurted me when it fired because of the ratcheting mechanism in the wrench.
regards sjef
|
|
tc
Full Member
Posts: 139
|
Post by tc on Oct 25, 2008 19:33:50 GMT -5
Hi guys
I was thinking that maybe it would be possible to graft the electric start from a SR250 onto a SR500 I havent checked it out but just maybe ...TC
|
|
|
|
Post by caferacercarl on Oct 26, 2008 2:38:17 GMT -5
Another thing that would help would be to make sure your static compression is set at only 9 to 1 say, and use a cam with about more than 90 degrees of overlap so that at cranking speeds the pressure level is low in the barrell, best of luck.
|
|
|
|
Post by phoebeisis on Oct 26, 2008 9:14:40 GMT -5
sjef- yeah, I need some sort of ratcheting mechanism. Too bad I can't adapt a socket wrench "head' to an electric/battery drill or torque wrench.
Caferacercarl- Ha,ha- another fly in the ointment. My piston started life as a 11/1 90mm JE. I ground the crown down about 11 grams to make it about 10.2/1 , but that is still lots of compression. Last time I checked it was over 200 PSI on about the 5th kick.A stock SR will be about 150 PSI. It has a modest cam- not enough to make much difference as the 200 psi obviously shows.
Thanks,
Charlie
PS-The weather is cooler here now(about 65 degrees at 9am 4 miles West of New Orleans).My bike starts much much better in cold weather-mid 50's-than in the 90's. The carb is jetted for a town in France-Krautergershine??- pretty sure it is much colder there than here-30 degrees North latitude. The start circuit is EXTREMELY RICH.The pilot and MJ are just fine, but the start circuit is too rich on hot days.
|
|
jeffz
Full Member
Posts: 215
|
Post by jeffz on Oct 29, 2008 16:49:20 GMT -5
Although not practical to carry with you, a starter for Briggs & Stratton race kart engine might work. It's basically a starter from a car mounted to a case with a 12v motorcycle-sized battery in it. There is a shaft with a socket welded to it that you use to start the motor.
|
|
|
|
Post by curly001 on Oct 29, 2008 18:17:58 GMT -5
For all you guys that use flee-bay look up flattrack/ flattracker thereis a gentleman that sells an electric starter for sr/xt motors. Uses a car starter motor monted on a plate that is held next to the mag sidecover. The mag cover is modified to allow the starter drive conection, which is a modified flywheel nut.
|
|
|
|
Post by wotavidone on Oct 29, 2008 23:27:51 GMT -5
Hey guys, when you do this, does the flywheel nut come undone?
By the way, can anyone give me an idea as to how many watts a starter motor is?
I remember the old Holden car starter motors used to have 1/3 hp stamped on them, which would be about 250 watts.
If there is an idea I have been pondering....
Mick
|
|
|
|
Post by phoebeisis on Oct 30, 2008 13:35:23 GMT -5
Curley/Jeffz- hey,I like those ideas. Yes, it might be practical for me to carry it with me. I have a rack on the SR500 with a coke carrying box wired to it. I can carry a pretty big heavy object in that Coke box.
Wotavidone- I'm wondering the same thing myself. I didn't notice what "hand" the threads were when I was playing with it a few days back. It it is "normal' threads, it will be unscrewing it,since you turn it counterclockwise to start it.
Any of you guys know this fleebayers name. I spend waaaay too much time on ebay.
The electric starter is a big enough deal for me to be considering selling my much loved much modified SR500 just for the electric leg. I still can 1st kick start it, but someday I won't be able to.
Thanks,
Charlie
PS I'll search flattrack starter on ebay and see what I find.
|
|
|
|
Post by caferacercarl on Oct 31, 2008 1:57:12 GMT -5
The average japanese starter motor has .8kw "mitsuba" stamped on it, hope it helps.cheers
|
|
|
|
Post by mattb on Nov 11, 2008 5:47:51 GMT -5
Double posting here from what I said in CJ's 'Starting a Recalcitrant SR' thread, but:
One could turn the SR into a single-seater, fit a small engine to the rear of the bike where the last of the seat was, with a folding roller (a roller on a folding arm) that folds down onto and against the rear tyre (obviously your fender is cut away) which, with the bike on a good centre stand, is off the ground. The roller is connected to the engine by a belt, just like CJ's invention. Elaborate enough, but not too much so for an SR kook (or ageing or injured fanatic), and there you've got your starter for your road SR! Cover it over with some top-box looking piece of neatness.
Another option, a strong flat board / piece of metal. The startor motor is built into it, connected to a roller in it near the bottom. You put the bike on a quality aftermarket centrestand, push the board slightly under the wheel with the roller up against the wheel, just like you push a pole under and against a boulder to get leverage, press the button and the roller spinds against the wheel! But I like the above idea better... The other possibility is the first idea but without the roller - instead a belt hooks to the little engine, which hooks to a secondary sprocket on the wheel.
|
|
|
|
Post by phoebeisis on Nov 11, 2008 8:43:38 GMT -5
Mattb- I like that folding arm roller idea. Would this gadget be rolling the wheel with the clutch pulled in and them siddenly "dropped" or would it be working against the compression the whole time? How fast does the roller surface/tire have to go- maybe 15 feet/sec-10 mph or so?
Charlie
|
|
THUMPS
Junior Member
THUMPS, ridden by Dave
Posts: 92
|
Post by THUMPS on Nov 11, 2008 10:47:06 GMT -5
Perhaps you might get a dished piston or an extra thick base gasket for your 500. Alternatively a CDI with more advance might be used so that you could start it with less ignition advance and yet have it run with the same advance.
|
|
|
|
Post by phoebeisis on Nov 11, 2008 15:59:55 GMT -5
Doublethump, I had the forsight to order some .040 or maybe even some .080" basegaskets from Cometic years ago for just that reason.I think stock is .020". The .080' would add about 6 cc to the combustion chamber volume and drop the compression to about 9.3/1-from about 10.2/1. The peak force/pressure should drop about 10%-a fair amount.
I'm unclear on how the ignition advance helps- do bikes start better with less advance?
Thanks,
Charlie
|
|
|
|
Post by wotavidone on Nov 11, 2008 16:17:20 GMT -5
Japanese starter motors are 0.8kw? Dang, that's a bit over 1 hp.
I had this idea for a certain type of very compact electric motor I thought would fit without too much fiddling, but the only come in smaller sizes, about 300w I reckon.
Mick
|
|
