Grind a Neu...
 

You guys grind a flat spot on the Neu's for your pinion? Or does 5mm give enough grip surface for the set screw...

Everybody here says grind it. I have not yet and so far no slipping.

I ground a flat spot on mine, you really need it given the amount of torque these motors produce. I also use some locktite on the setscrew. If you do those two things you should rarely have a pinion come loose.

Bye:mdr:

Yeah I know its what I should do... but I hate to touch a dremel to such a purty motor...

Its a 1506 so I might try and get away without it.... at least until a $15 pinion goes bye

i never grind them, one less thing that can damage the motor! i soaked my pinions in denatured alcohol to remove all residues and once they dried picked one added small amount of locktite and haven't spun one yet! i change pinions frequently.

If you don't grind the flat spot and your pinion slips will anything bad happen have a 1515/1y I am putting together and it scares me to grind on my 300buck motor

you could possible have a nice circular ring around your shaft...just tape up the holes and file it... it's easy.. takes 30 seconds...

steve knows how to do it - he did a great job on the lehner i have.... haven't lost a pinion off of her yet. :party:

I lost 2 pinions on my 1515/2.5D before I finally broke down and ground a flat spot on my shaft, I too was scared because it's a pricey motor but it turned out great and haven't had a single problem since. Also loc-tite usually has a 24hr curing time so be sure to give it enough time to set before you bash on it Good luck.

I ground the shaft on mine. I never use loctite, and the pinion doesn't come loose. I don't grind the last 1mm or 2, so if the pinion does start to come loose it shouldn't be able to slide past the ridge at the end of the shaft.

I ground a flat spot on mine too, but I did have to also use lock-tite to keep the stupid grub screw from coming out. But that may be because I'm using a metal pinion on a metal spur.

I'm another flat spot grinder and loctiter. :D

I wouldnt run it without the flatspot

I don't understand why they just don't come with a flat spot from the factory. It would be easier on us, and then there wouldn't be any warranty issues to deal with. How much more would it cost them?

@ nl12- You're in Pensacola? I was stationed there about 4 years ago. Do they still have the red clay off-road track by the mall? I know they got a nice asphalt on-road track setup as I was leaving. I have some pics of us running out there, I'll try to track them down.

I ground flat spots on both of my Neu's but I don't use locktite anymore. Every time I use locktite on grub screws I end up breaking off the tip of the hex driver in the grub, It is a total pain using a Dremel cut off wheel to remove the pinion gear.

What color lock-tire do you use? Blue has always worked for me, but I also make sure my allen wrenches have a nice (non-rounded) tip...

I had this one grub screw that kept coming loose so I tried filing the grub screw flat which ended up making a difference. That way you have more surface area on the flat spot.

Okay guys - got a followup for ya...

Is it "bad" to have a setup where the pinion is mounted so that the gears are closer to the motor and the grub screw pointed away...? Does it matter..?

I've done both and never had any issues..

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Most of my pinions are this way...I've never had a problem.

shouldn't you be studying for finals or something?:whip:

My pinion is this way also, no problems.

My Finals aren't until January...in HS, the week before winter break is just kind of "lull" week, cause most teachers have given up instructing anything cause everyone is so excited.

Being a newbie does anyone have some pics of their flat spot they ground on their motor I can see?...I need visual to be comfortable grinding on mine...lol

It really depends on what your running the car on. (under race conditions) ive spun pinions off my motor on clay tracks but ive had good luck with them staying on on loose loomy dirt also... But i eventually ended up grinding a flat spot on my motor because its one less thing i have to worry about over a 25 min main.

I think this guy needs some reassurance! You can do it. You can't hurt your pretty motor. Grind away! If you're afraid of removing too much (you can't unless you remove half or more) align your gears, figure out where the grub screw will hit, and only grind there. It only takes a little flat spot. if you're scared use a file, I wack mine with a cutoff wheel and a dremel, you're making it way more difficult than it is. Get flatspotted!

:lol:You guys were right. :oops:After about 12 runs I just lost my pinion. Thankfully it did not damage my spur and I found it. Now it is just a matter of a little dremeling.