Nsr 125 starter problems, continued.

[Thom]

Right, hello!

My parts arrived from DSS this mornign and i've installed them into the starter motor of the bike.

Good news is the bike now turns over and i had it start once

Bad news is it took ages to start and it now sounds like something is almost catching or scraping as the bike turns over.

I imagine this could be due to the new starter brushes offering alot of physical resistance against the pinion but even with a fully charged battery it still seems as though it's not putting enouhg power through.

The spark plug is fine, oil's fine, i have some fuel (tanks on reserve) and the kill switch isn't on.

I tried starting with out any choke, nothing, with a little bit of choke it ran and sat at 1700 rpm, when i killed the bike it wont start up again and just runs.

Suggestions?

[finpos]

The new bushes won't make any noticeable difference to the resistance of the engine turning.

I suspect you've just guffed up the spark plug firstly with it not starting off the choke and then leaving it idling on the choke. Try a new one.

f.

[Thom]

surely if the sparks there, contacting at the right point and its a strong blue spark then theres nothing wrong?

Also i did notice when i removed the sparkplug it was slightly damp with a black mixture on it? would this be petrol/oil o r carbon desposits as it was a liquidy sort of substance but with a petrol smell.

[finpos]

Yep, sounds exactly like a guffed plug.

First rule of two stroke - if it randomly stops starting, stick a new plug in it

If you don't want to do that, get the plug absolutely as hot as you can in a gas flame. You want to burn all that oil/petrol/carbon off it. Put it back in while it's still hot (ouch), the engine will probably start.


f.

[TUG]

Spark plugs act differently in the engine under pressure than they do when your holding them against your frame, this happend to hmmmz, he got a new set of plugs and it fired into life.... literally.
____________________
Haz ER-5, innit!

[Thom]

well luckily i bought two plugs so i'll try the second tomorrow, lets hope that sets it all off for me

[Thom]

right!

I've swapped the plugs around for a new one and it still wont make a difference.

The bike turns over, but its as if it's only got half a charge, its a slowish turn over to what it needs to start, as if the batteries going flat, but its not its full (just charged it and tested it).

So, i've determined that something between the spark plug and starter motor is either fouling or reducing the current in some way.

I havent previosuly removed anything but the starter motor from around there, so i believe it'll be this, what could it be though?

The bearing race on the starter motor has gone, but these cant be replaced, however it was working fine with a broken race before i had to strip it down. maybe it just needs grease for it to operate properly?

Any advice is good advice(Y)

[finpos]

Just because you have charged the battery unfortunately doesn't mean it's any good I doubt you have the kit to test the battery under load, which is what matters in this case. If the starter is labouring, the battery will be the prime suspect. Also realise when the starter is labouring because the battery can't supply enough current, it tends to suck all the power from the ignition so the spark plug isn't firing either.

Easiest thing to do is get jump leads and a car battery, see if that spins the engine quicker. If it does, your battery is borked.

If you can't do that, try the starter with the plug out - with no compression it should whizz around quite smartly. Again, if it slows down a lot when you put the plug back in suspect the battery.

f.

[Thom]

it wouldnt do anything with the plug out.

I'll try and persuade my dad to jump the bike for me, see if that makes any difference.

any other suggestions though?

[finpos]

[Thom]

I've thrashed the bike tonight!

The problem seemed to be the starter flywheel, i covered in in 3 in 1 and it gradually span faster and faster, seems it was stiff!

Now the bikes a dream, not a rattle coming from it

thanks for all the help guys!