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The engine spins over absolutely fine with the plug removed.

Yep, reading taken at posts at the he closest point to where they enter the battery body. Sadly I don't have an ammeter, just a digital multimeter.

I'm guessing they should all read the same when cranking, otherwise I'll have an earth issue? Will try to check it in abit but not sure if I'll have a chance today. I've already checked and cleaned all electrical connections, removed and cleaned where the earth lead from battery is bolted to...

Voltage taken at battery terminals.

Yep, spins over fine with no plug in. Battery reads 12.8v then when I turn the key with the plug out it reads 10.8v

O k ..... So new battery bought and charged just to make sure it wasn't flat/low from the shop. Its a 12v 30ah 330cca so plenty powerful enough, but the result was the same as before, the engine tried to turn but only goes about half a rev then locks. I'm pretty sure what someone mentioned...

It would also be worth cleaning the carb out. Have a good look at the float and the jet in the carb, it could be a blockage in there or something restricting fuel flow.

Quick question on the battery.... It has a 26ah battery on the mower, is this the correct one? It's got a code on it saying 101r 26ah. The same battery as my other mower but with the terminals reversed. Just want to make sure as after all the other problems I've found so far, it wouldn't...

I'll get a new battery tomorrow hopefully and try that, them go from there. Thanks for all the help so far.

Right, so battery appears to be bad, charged on trickle charger all night (18 hours). It reads 12.8v at rest, turn the key with the plug out and lights off so no other drain on it and it reads a steady 9v. I'm guessing it should be higher than this with no load on it?

Thanksbgor all the replies everyone. I'm going to go try the battery again in abit, still on charge as I type this. Electrics are my weak point with cars, etc.... I'm fine if you ask me to rebuild an engine or axle, but for some reason I've always found electronic stuff to be a nightmare...

Thanks for the reply. Very good point about the other engine/battery, it's only a 10hp, but that battery was bought brand new for that mower 5 months ago so would assume it's pretty decent still after that little time. Currently got the 'not cranking so well' battery on a slow charge so will...

Thanks for the advice, I'm guessing its a common thing then? Parts don't seem hard to come by and cheap enough. Is there anything else worth doing while I've got the engine out and all apart? Was thinking of doing rings and obviously gasket set at the same time. Any pointers for things to look...

Hi all, first post as such (apart from my intro) so please bear with me. I've got abit of knowledge of mowers and engines in general, but this new (to me) mower has me stumped and I don't want to spend anything til I narrow the problem down, this is where I'm hoping someone on here has had a...

Hi everyone, thought I'd join the forum after finding some advice from here a few times recently while trying to fix my ride on mower(s). Got to say, what a great forum it seems to be, with some really knowledgeable and helpful people. Hopefully I can input abit of knowledge and help others...