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Post by Alex JB on Aug 30, 2017 22:30:45 GMT
Hi folks,
I have a 250N engine that I plan to dump the e-start and just keep the kick start.
Reason is the battery and electrical system in the bike the engine is going into is too small to support an electric start.
I have a manual on order, but not sure if it will tell me the watts or amps pulled by the starter motor or the wattage that the stator will put out, does anyone know off hand?
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Post by BritPete on Aug 31, 2017 7:56:43 GMT
It seems a lot of work to remove and seal the starter mount
I would just leave it in place and use the kick start
Better still the alternator is in the SD engine and use a lithium battery which are much smaller than the original SD lead acid
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Post by Deleted on Aug 31, 2017 9:16:10 GMT
Alternator 130W IIRC on the 250. Is the motor power shown on the end casting ? - 0.6kW as a guess. Should be able to get a small enough battery to supply the amps - if you pay enough for it !
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Post by Deleted on Aug 31, 2017 9:29:17 GMT
Starter motor pulls all the amps it can get, only limited by the size of the cables, condition of connections, resistance across the solenoid and internal resistance of the battery. That's why AGM batteries crank faster- lower internal resistance......
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Post by Alex JB on Aug 31, 2017 11:47:03 GMT
Thanks guys,
I already have a AGM battery, it's tiny and under the seat hump, couldn't get a lot larger in there.
I am not sure it has the capacity to crank a starter motor and I have none of the wiring, relays/solenoid or button for the e-start either
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Post by Alex JB on Aug 31, 2017 12:07:45 GMT
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Post by Deleted on Aug 31, 2017 13:49:07 GMT
That battery looks big enough to spin an SD engine?
Never noticed the "0.6kW" stamped on the starter motor before- but it is definitely there! It does work out a hefty 50 amp draw at 12 volts though. Trouble is- you never maintain that 12V when cranking, bacause of the reasons I gave- more like 8-10V. The series wound DC motor doesn't care- it still wants the same power draw, so more like 60-75A at that reduced voltage.
This is why a lot of old bikes fail to start on the starter motor, but will kick off- the coils only get a fraction of battery voltage when they most need it. Not a problem with the SD's though with self generating CDI- one reason they are good and reliable starters!
I would try that battery....
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Post by Alex JB on Aug 31, 2017 16:07:44 GMT
Thanks,
Once the engine is rebuilt I will try the starter then, will do it on the bench first with that battery as I'll have to make up the other electrical bits to go with it
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Post by Alex JB on Sept 5, 2017 22:37:45 GMT
Got my Haynes manual (£7 on flea bay) so will be tearing into the engine this coming weekend!
Measuring up the mount points, chain line overall height and width, the 250 is going to take quite a lot of work to get into the CD.
Maybe I need a running superdream to ride while the CD is torn down?!
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Post by Deleted on Sept 6, 2017 11:52:13 GMT
go for it at least you will have wheels
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Post by Deleted on Sept 6, 2017 12:01:38 GMT
Got my Haynes manual...... Use the Haynes in conjunction with the proper Honda manual is best- where they differ then go with the Honda one. I think you need 20 posts to access it, but you are about there now anyway..... honda-superdream.co.uk/board/29/manuals |
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Post by Alex JB on Sept 10, 2017 22:21:26 GMT
The CD tank got priority, and a 40 mile ride out  did start on the SD engine. looks immaculate inside the top end my son's first engine tear down 👍     |
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Post by Alex JB on Sept 10, 2017 22:25:57 GMT
The Haynes is not bad, I have quite a lot of the older Honda manuals from the Hondatwins.net guys, but they don't have a 250/400N shop manual as they never got the Superdream that side of the pond.
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Post by Alex JB on Sept 11, 2017 21:26:41 GMT
Head is off, bores look good, can still see the honing marks.  however, the exhaust valve on one side looks eroded. i only cleaned the dodgy side so far, to have a look at the valve   going to get a spring compressor and get it out, but I'm gguessing it's shagged. |
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Post by Alex JB on Sept 12, 2017 19:25:54 GMT
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