just started and stressed

[scooba]

hi im from scotland i had a read at a few of these sites an thot i could do it maself so i got an old sit on lawn mower stripped it all down to bare frame fiddled with the gear box and thot i was ready to mount the engine. turned out ma engine wont start so i cheked for a spark and im getting nothing attall. i cheked over all the wires,fuses,relays ect and everything looks ok was wondering if anyone knows if i have to have a battery connected? its a briggs and stratton 12.5 hp engine

thanks for ur help

 

[mikeandike]

well if theres fuses and relays then yeah you probably need a battery. Is it electric start?

 

[scooba]

am not sure ware abouts would it b on the engine and what would it look like. av never even seen a mower engine till friday there so am not sure wat am lookin for

 

[scooba]

1 more thing would there b any way to change it so i dont need any electrics


cheers

 

[kibble]

It would be great if you could post some pictures of what you have so that we could take a look and see what can be done. If you could find the engine model number that could help out as well.

 

[scooba]

av got a few pics but theyv been took with a fone so the qualitys quite poor but a'll get some tomorow for ye av got the model number here tho its 286707. iv been told that it might b dampness in the coil u think tht is possible?


thanks for the replies man much appreciated

 

[ryf]

you WILL probably need a battery, the wiring is pretty simple unless your like me and want a winch, alternator, etc.

when you fiddled with it, there is a wire that "shorts" the coil, if you hooked this to a power source, it would not start, and get no spark, and maybe ruin the coil. luckily at least state side they are cheap. any idea what year the engine is? that will help get us to what your dealing with (electric fuel cut offs, etc) the coil ground wire is the only part that is very different from a car. most don't need a battery to run, so if you use a jumpercable to start it, it should continue to run. but if you stall it in a field, you will be in trouble. so I'd get a battery before you start playing too hard.

My engine is a riding mower engine as well, look forward to seeing your progress.

 

[kibble]

I found the manual for your engine model that shows all the parts but there's three versions of your engine; Pull start, Electric and Pull/Electric. Which one do you have? If yours is just a pull start then you shouldn't need much to get it going.

 

[scooba]

am not sure what year it is atall man. the engine used to have an electric starter but it was removed before i got it due to how cheep it was but i spoke to a mechanic about it an he said that i could remove all the wireing because the magnieto would still give power to the spark plug if i can get the engine spinning fast enough so i was goin to mount the engine to the trans axle and bump start the engine just to make sure it runs. if it runs im goin to try taking the starter out of my busted scooter and mounting it to the top of the engine.think it would b powerfull enough to turn my heavy engine? the scooter only has a 50cc engine a'll try to get some pics soon to let all u guys see what its looking like. i was wondering if anyone knows what the gap between the flywheel and the maneto should b on this engine or could tell me ware i would find out would b much appreciated
cheers

 

[kibble]

I read somewhere that the gap between the magneto and the flywheel should be enough where a thin butter knife can fit into.

 

[RobertD]

well, from what i remember from my book, it needs to be .012 to .016 of an inch. You need a feeler guage to get it right. i'm unsure, so i'd do some more research.

 

[scooba]

thanks for the info bud av got a gauge so that'll b sorted on monday. does nyone know if the electrics can b takin away and the engine run and start? a think the mechanic that i spoke to said the magneto will generate a spark its self iv still to mount the engine so i wont b able to tell you's if it'll start buti think it will because its getting plenty of petrol throu the system and it was running before i got it. anyway thanks for the replies guys much appreciated think i would still b pulling my hair out without you's. a'll get some pics to you's asap to show u how im getting on

thanks a bunch boys
scoob

 

[scooba]

iv ran into another problem am not sure witch way the engine should turn. i was about to mount the engine the other day wen i clicked on that i didnt know what way the engine should turn.good job i rememberd anyway if ur lookin at the engine from the spark plug should it turn clockwise or anti clockwise?sorry for not gettin any pics guys a was waitin on ma mate givin me a shot of his cam but the useless c*** has'nt gave it yet so a'll take some with ma fone an get them on as soon as so you's can c how im getting on

cheers

 

[kibble]

Not sure what you mean by looking at it from the spark plug, but if you're looking straight at the shaft then it's gonna spin counter-clockwise.

 

[mikeandike]

look which way the pull cord turns the crankshaft

 

[scooba]

aye a would but its not got a pull cord it used to b a electric starter but it was removed before i got it. im not too sure but i think i remember what position the engine was in wen it was at the front so a'll just mimic it at the back cheers anyway boys. am goni go take some pics tomorow so a'll have them on by wed

cheers