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Puzzled By GPZ Detecting Tiny Nuggets Deep But Missing Shallow Shotgun Pellets

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19 minutes ago, mn90403 said:

Make that one a separate thread.

I will...I was just teasing you with an appetiser. :laugh: Simon has just left my place to go for a solo detect. I am still getting over yesterday's mammoth effort of E-Biking up to that paradise. Stunningly beautiful country but you can see how brutal it is for detecting & backpacking the Zed & all the paraphernalia.:rolleyes: But someone has got to do it.

20180908_112139

Bit of work gone into that ground

20180908_124947

Maybe it was the weight of the gold I carried back out that broke the camels back. :laugh:

Oh.....& guess what?.....Not one shotgun pellet....or .22 shell casing or lead bullet head

Good luck out there

JW :smile:    

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Kiwi, I was going to make a suggestion on your ebike.  If you do a lot of hill climbs, swap out the front sprocket for a 30 tooth chain ring.

Thats what I run here in the California hills. You might loose a little top speed, but you gain waaay more torque going up hills and put less stress on the internals of the motor. Its a very good mod for those kits and not expensive!

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Thanks Wes,? That is something I have been looking at doing. The standard front chain ring is 46 tooth & I was wondering what the best size would be for a lot of uphill grunt work. So thanks for your recommendation.  Yes...the top overall speed isn't that important to me but the uphill with less effort on my behalf & less stress on components is. Probably why Mrs JW broke her chain. Gravity dictates my down hill speed & that is usually way too fast. So that's where the 203mm disc brakes & 4 piston callipers hold me back. :biggrin:  Cheers.

Good luck out there

JW :smile:

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Yep I'd try the smallest ring you can get- 30 or 32 tooth.  Your bike will be a whole different hill climbing beast. One thing, your chain line might not run as straight when in the lowest gears, depending on your bikes geometry. Just run a good chain, keep it lubed,  and it shouldn't be a issue. Thanks and have fun!

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1 hour ago, WesD said:

One thing, your chain line might not run as straight when in the lowest gears, depending on your bikes geometry.

Thanks Wes, Yes I was thinking of the geometry as the Bafang sprocket has quite a bit of throw in it. My back sprocket cluster is 9 speed. A lot of the purpose built E-Mountain bikes are 11 speed. A local bike shop has the sprockets. I may just settle on a 32 tooth sprocket, will talk to the bike mechanics & see what they have to say re sprocket size & the geometry thing. I need to go to Aussie, not physically, to get the adaptor for the sprocket to fit the Bafang set up. Thanks for your input. By the way, what size motor & battery are you running? Legally here in NZ we are restricted to 300 watt motors & a power assist speed max of 25k's an hour on public tracks & roads. Which is what I ended up getting. I should have gone for at least the 750 watt set up as I aren't so much on public roads or tracks with my detecting. There is even a 1000 watt set up which I see is popular in the States. Cheers

JW :smile:

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4 hours ago, WesD said:

Just run a good chain, keep it lubed,  and it shouldn't be a issue.

Good bit of advice there JW.   What I don`t know about E Bikes would fill an encyclopedia, but years ago I owned a single cylinder 600cc thumper trail bike and it was an awesome bit of gear for going up hills.  I put a $30 chain on it and it lasted two trips, I then put a $130 O ring chain on it and never had to replace it again.

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Kiwi, I have the 750 watt bbsHD motor. Its the newer version thats supposed to have  beefed up internals. These  have a bad offset for the chain line to begin with, but it hasnt been an issue for me, even with the 30 tooth. Been using a gold KMC chain and have about 300 miles on it so far.

A friend of mine has the same setup as yours and also runs a 30 tooth sprocket. He had an 8 speed rear cog that he moved the lowest gear to the center, so that his chainline is perfect in the low gears.  Honestly he didnt need to do that as mine runs fine with some angle, but if you want it perfect, that's an option to remedy that.

Man these things are super fun.  I used to kill myself biking up hills and now its all thumb throttle or some moderate pedal assist.

What I also like is they run so quite that no one is bothered or suspects you have a motor. Stealth!

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12 hours ago, phoenix said:

 I put a $30 chain on it and it lasted two trips, I then put a $130 O ring chain on it and never had to replace it again.

Hi Dave, I learnt very early on with my mountain biking that quality costs but it is worth every cent with getting the top end componentry that will take the battering & rigours thrown at it that comes with serious mountain biking. It comes down to lightness & durability. You don't get that from steel. :biggrin: Sometimes you have just got to spend the money. Bit like on detectors. :rolleyes: Cheers.

Best of luck out there

JW :smile:    

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I'm with Strick on the sounds and knowing what is and what usually is not.  I take groups of prospectors out and work with them quite often.  They seem to find the tiny surface targets I miss and ask how did I miss it.  It was not that I missed it, it was more of the sound was not right.  I don't dig many small surface nuggets either, so on occasion a leave them a dink.  But my odds are better off if I go for the narrow soft sounds.

I do the same thing when hunting old parks and schools.  I don't dig many modern coins and usually end up with more old ones than new.  Anyone who hunts with me, goes nuts as they dig 2X the amount of coins and still end up with less older ones.  Again, I play the odds to my favor.  Now to be fare, not all sites and or areas can be done as I mentioned.

My ear and coil control are my odds makers and most of the time I can usually play on house money.

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