Z's HPI Baja PT:2

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misterleon said:
He said .3-5mm
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yep doug you missed the .
if it was 3-5mm i wouldnt be on here asking and that thing would be in the trash . i must say, i am not pleased with vertigo at all. the pinions fits sloppy as fek on the bell (before tightening), bearing went out on the carrier (the outer bearing had quite a bit of slop). its almost like i bought a feking rovan product for 2x what it was worth. and if its actually feked enough to be a problem then that just adds to it. never again
 
Seandonato73 said:
Theres your issue. Bearing is out or your shaft is bent. Tbh the hex could be machined off concentric and well, but looks more like a wobble then an off center rotation.
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bearings feel like new, even when hot (i checked it right after the spur stripped), i believe its off centered slightly, not bent, because it kinda goes side to side instead of wobbly (hard to explain) . im going to get in contact with ddm , cuz this shouldn't be like this after just 3.5 gallons :rolleyes:?doubt they will do anything about it but worth a go. its definitely not my fualt at all. its been like this for the longest time and ive only taken the pinion off twice (once to remove the old carrier bearings and once to change to 18t pinion). and i never dropped it or wacked it or anything .
 
If the hex is ground off center it should have one side that sticks out a bit farther from the shaft. Easiest way to check it with a dial indicator off the gear, or (which ill assume your going to do anyway.) Pull the clutch bell out, bolt the pinion gear on and measure from the shaft to the pinion teeth at multiple places to see if the hex is off set from the shaft. If you have a real hard time removing it, I would assume the shaft end is tweaked and the hex is ground concentric
 
Seandonato73 said:
If the hex is ground off center it should have one side that sticks out a bit farther from the shaft. Easiest way to check it with a dial indicator off the gear, or (which ill assume your going to do anyway.) Pull the clutch bell out, bolt the pinion gear on and measure from the shaft to the pinion teeth at multiple places to see if the hex is off set from the shaft. If you have a real hard time removing it, I would assume the shaft end is tweaked and the hex is ground concentric
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well the last method wont work , its soo sloppy anyways , if it was bent i would have not known . ill take the bell out and measure it. don't have a dial indicator so i cant tell with that.
 
Z, try taking pinion off and rotating it, fitting it in a different orientation, you may be able to get it better or prove its ground wrong. On my Baja I have a KM sealed clutch carrier, I've just replaced the bearings and clutch bell due to a seized bearing grinding away the bell shaft (easy) so bearing fit was bad, it didn't strip the spur or pinion, I'm running a hostile spur.
Something must be bad for you to keep stripping spurs like that. Do you have your diff locked and are you killing anything else? Are your brakes dragging or is you clutch dragging causing excess heat?
I only ask as I abuse my Baja and bash it like a 1/10 scale truck (probably why it breaks lol) but the spur, diff clutch etc all hold up fine. I keep blowing diff cups instead or drive pins.
I wonder if your rear plate is bent meaning spur and pinion don't align correctly. Just thinking out loud here btw.
 
KevTrem said:
Z, try taking pinion off and rotating it, fitting it in a different orientation, you may be able to get it better or prove its ground wrong. On my Baja I have a KM sealed clutch carrier, I've just replaced the bearings and clutch bell due to a seized bearing grinding away the bell shaft (easy) so bearing fit was bad, it didn't strip the spur or pinion, I'm running a hostile spur.
Something must be bad for you to keep stripping spurs like that. Do you have your diff locked and are you killing anything else? Are your brakes dragging or is you clutch dragging causing excess heat?
I only ask as I abuse my Baja and bash it like a 1/10 scale truck (probably why it breaks lol) but the spur, diff clutch etc all hold up fine. I keep blowing diff cups instead or drive pins.
I wonder if your rear plate is bent meaning spur and pinion don't align correctly. Just thinking out loud here btw.
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I tried moving the pinion and such, doesn't change. Still mobbly. The gear mesh gets fairly tight (you can feel a tight spot) when rotating it, because of the screwed clutch bell (i, assume), I might check the layshaft to see if it is bent, worth a shot ?‍♂️ but that wobbly ass pinion Is definitely an issue. Diff ain't locked, running fairly thick oil though (60k). I'll check the brakes but I don't think they are binding at all. My clutch is completely fine, no slip or dragging or anything. I'm only killing spurs, nothing else. Ill get a straight edge on the chassis to see if it is bent, but even if it was the top plate and all the mounts would hold it together, and btw all that fits like a glove, don't have to force anything into place.
 
Z.hb71 said:
I tried moving the pinion and such, doesn't change. Still mobbly. The gear mesh gets fairly tight (you can feel a tight spot) when rotating it, because of the screwed clutch bell (i, assume), I might check the layshaft to see if it is bent, worth a shot ?‍♂️ but that wobbly ass pinion Is definitely an issue. Diff ain't locked, running fairly thick oil though (60k). I'll check the brakes but I don't think they are binding at all. My clutch is completely fine, no slip or dragging or anything. I'm only killing spurs, nothing else. Ill get a straight edge on the chassis to see if it is bent, but even if it was the top plate and all the mounts would hold it together, and btw all that fits like a glove, don't have to force anything into place.
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I thought it would be fine but as I said, I was just thinking out loud.
Hopefully it is something daft like the clutch bell needs replacing or the pinion.
Fingers crossed.
 
misterleon said:
It’s a hobby grade rc not a fiddlesticking jet engine. .3mm of play is fine. Full send...
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Clearly it isn't, if I'm destroying spurs like that. People are running those in 57 twins and full mod reed engines making more hp then I am without issues. Plus the tight spot in the gear mesh is clearly not supposed to be there
K so I measured it up and my calipers say that it's not bent (they also aren't accurate what so ever). But I chucked it up to my drill and it wobbles a decent bit. So its either bent or made wrong. Either way it's a pretty good amount of wobble.
 
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You need to go back about 20 or so pages to the last time you ate a Spur gear. You had to much slop between the gears and never corrected it . Until you get a better mesh you are just going to keep eating gears Z. I really couldn't see any wobble in your pinion gear/shaft . Any wobble I saw was induced by your palsey causing your camera to shake.
 
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