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Old 10-28-2014, 06:53 AM   #31
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Yeah that happens!

The thread pitch usually depends on the manufacturer of the pinion. I'd imagine it is not a stock part so you may have to do some fiddling. I think the standard sizes for 1/8" bore pinions is 5-40 for standard and 3x3 for metric?
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Old 10-28-2014, 06:58 AM   #32
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Well I believe it's the stock HPI pinion - purple color. 1/8 / 3mm bore. It's more than likely metric, because I've been using all metric tools on it...1.5mm or 2mm allen key I've been using on the set screw (I can't remember off the top of my head).
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Old 10-28-2014, 07:00 AM   #33
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It should be a 1.5 head 3x3 then. This the the HPI part number http://www.hpiracing.com/en/part/Z700 but you can probably order them on eBay or somewhere a lot cheaper.
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Old 10-28-2014, 07:46 AM   #34
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Are you using a real hex driver or an Allen key. With a real hex driver you should be able to snug the pinion down nice and tight so it doesn't come off. I used to have the same problem all the time when all I had was Allen keys.
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Old 10-28-2014, 07:56 AM   #35
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Quote:
Originally Posted by MikeGozz View Post
It should be a 1.5 head 3x3 then. This the the HPI part number http://www.hpiracing.com/en/part/Z700 but you can probably order them on eBay or somewhere a lot cheaper.
That's the one. I'll see if I can grab a bag of them at home depot or something.
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Old 10-28-2014, 07:59 AM   #36
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Are you using a real hex driver or an Allen key. With a real hex driver you should be able to snug the pinion down nice and tight so it doesn't come off. I used to have the same problem all the time when all I had was Allen keys.
Yeah just an Allen key. Too short and small to provide enough torque. I have to find a hex driver too...maybe there is an rc too kit that has one in it? I've just been using my automotive tools lol.
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Old 10-28-2014, 08:09 AM   #37
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http://www.superiorhobbies.com/store...c%29%2C+Metric

These are what I use. One of the best investments in this hobby I've made. You can also buy them individually if you only want the 1.5.
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Old 10-28-2014, 08:41 AM   #38
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Thanks. I actually just found an individual one at work lol. I might get one for the motor mount screws too...That's a 3mm hex for the motor mount screws right?
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Old 10-28-2014, 09:08 AM   #39
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That's 2.0 or 2.5. The 3.0 is only used on larger models.
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Old 10-28-2014, 09:47 AM   #40
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Alright it's probably the 2.5 then. I'll just wait til I get home and double check the sizes before ordering anything lol.
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Old 11-01-2014, 11:26 AM   #41
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Yesterday I got the 2S 5200mah Lipo battery, New set screws for the pinion gear, and today I got the spare set of control arms. Last night I put the battery holders back in to slide the Lipo in place....and the rear chassis blocked it by a couple millimeters lol. So I'll have to Velcro strap the battery in place.
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Old 11-02-2014, 08:16 PM   #42
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So the Turnigy 2S hard case Lipo that I got was a little too tall, and it was hitting the belt, so I'll have to return it. Does anyone know of any slimmer batteries?
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Old 11-02-2014, 08:24 PM   #43
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Shoot no way! Where was it hitting on the chassis?

It fit in my RS4 using the battery brackets in the stock location. That's a bummer... it is a beastly battery. If you need something slimmer you will probably have to just search through the 2s batteries on HK and find one that has smaller dimensions.
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Old 11-02-2014, 11:14 PM   #44
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On the chassis, it was hitting where the rear of the top deck mounts in with screws, then if I moved it forward, it would be hitting the belt. Are soft case Lipo batteries slimmer?
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Old 11-03-2014, 05:53 AM   #45
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Generally yes but they make lipos lots of different sizes. The exact dimensions of each battery are listed on hobbyking. This is why I recommended a saddle pack. We tried several lipos in my friends pro2 and all but saddle packs rubbed the belt at least slightly.
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