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How to set spur gear mesh?

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Dug into the trans, had to replace 2nd gear because my ball bearing fell out, and destroyed the gear. I had a professional shop replace my spur, test and tune and set shift point. Ran one tank of gas, then on 2nd tank I melted the slippper pad so bad that the brass bearing melted into the spur gear and was destroyed. I have since thought about chaning the gearing of my spur/cb and am having some concerns. They say higher is slower top end, which is fine for me, I just dont want to keep only getting 5min of play. But whats the best for huge tires. 52/16? Or lower? 52/14? Who knows.. I just want it to run.. I'm so tired of this..
 
Looks like 52/13 or 52/14 would be good..
 

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What tires are u running? Jumbo Kongs or CEN wheels?

That's really short gearing. lots of guys run Pro-Line 40 series and 3.8's and don't have drop down to a 13t clutch bell. Honestly I don't see any reason to go down further then XL gearing which is 16/52 but if u are running the tires I mentioned above then yeaaa 13 or 14 cb may help out with the issue.

Ceramin slipper pads:
http://www.hpiracing.com/en/part/107454
 
They are pro-line Trenchers. I dont know what gearing to use, I have been using the 17 vented bell housing, and 47 tooth plastic spur, but keep melting the slipper pads, and if not that the gears are stripping out. I wanted to go to a lower gearing so that it would be easier on my slipper pad, but just dont know what to use.. 16/52 is stock for the XL? Maybe i can try that.. I just want to run.. I've had the truck all summer and I swear have only gotten less than an hour of total play time. But yet have put hundreds in upgrades, because each time its "fixed" I go ahead and upgrade something, and BAM.. spur is bad again..
 
I had similar issues running revo 3.3 tires with 47/16 gearing. I upped the spur to 49 and then my spurs lasted longer without melting the center out. But I just bought a 47T hpi steelspur and it seems t old up ok. The LRP easily has the torque to deal with 47, but the slipper just melts out the center of the spur when it's plastic.
 
olds97_lss said:
I had similar issues running revo 3.3 tires with 47/16 gearing. I upped the spur to 49 and then my spurs lasted longer without melting the center out. But I just bought a 47T hpi steelspur and it seems t old up ok. The LRP easily has the torque to deal with 47, but the slipper just melts out the center of the spur when it's plastic.
Click to expand...

So, what are your thoughts on 49/17? What slipper pad are you using with the steel spur? Stock slipper?
 
If i were u i'd try a steel spur either 16t or 17t.

Try locking down ur slipper all the way as tight as u can get it then backing it out 1/4 of a turn, hell some people even leave it at fully locked but i'd only try that if my engine was powerfull enough like a ERCM Picco or Clocked Picco.
 
sgra2951 said:
So, what are your thoughts on 49/17? What slipper pad are you using with the steel spur? Stock slipper?
Click to expand...

I'm using the pad that came with it. Appears to be like the one that comes with plastic spurs.

I do have the nut tightened down pretty good, fully tight, then backed off about 1/8th of a turn.

My LRP is just now getting fully broken in and putting out some silly power. I could still easily gear up the bell to a 17 and have plenty of wheelie power. Right now if I punch it, it will flip and land on it's roof. In the grass, I get second gear wheelie most of the time when it shifts if I'm really leaning on the gas.

So far, it's holding up great. I took it out again today and the more I run it, the better the LRP does. I'm just glad that it has a bit more top speed now. If I had a spare 17T cb laying around, I'd try it and see how it does.

I had made a chart to keep track of what I had and what I tried.

I now have with steel spur (melted centers out of plastic spurs, working well with steel spur):
47 16 2.9375

I had running stable with a plastic spur:
49 16 3.0625

Your question
49 17 2.882352941

If I were to run 49/17, it would need to be with a steel spur since it's even higher gearing than I run now.

this is higher obviously than 47/16
47 17 2.764705882

49/17 is a bit higher geared than 47/16



This is my entire list sorted by ratio:
spur Bell Ratio
47 19 2.473684211
49 19 2.578947368
47 18 2.611111111
49 18 2.722222222
52 19 2.736842105
47 17 2.764705882 - next I might try if I pick up a new bell.
49 17 2.882352941
52 18 2.888888889
47 16 2.9375 - good with steel spur so far
48 16 3
52 17 3.058823529
49 16 3.0625 - as high as I could go with plastic spur without burning it up.
47 15 3.133333333
52 16 3.25
49 15 3.266666667
47 14 3.357142857
52 15 3.466666667
49 14 3.5
47 13 3.615384615
52 14 3.714285714
49 13 3.769230769
52 13 4
 
Last edited:
olds97_lss said:
I'm using the pad that came with it. Appears to be like the one that comes with plastic spurs.
I had made a chart to keep track of what I had and what I tried.

I now have with steel spur (melted centers out of plastic spurs, working well with steel spur):
47 16 2.9375
Click to expand...

I'm going to try this, I'm going to order the parts today.. Did you have to widen the slots where the engine bolts up? Or stock slots help up..
 
Ok, I just ordered the 47 count metal spur. Should I stay with 17 count fb then? Or go ahead and order the 16 ccount one
 
47TSG/17TCB is the optimal gearing for speed/torque when using the standard OEM engines for the savage X, if you drop a tooth in you CB you'll lose a lil bit of the top speed, and you'll gain a lil on the torque
 
Ok, ordered the 47 metal one.. Ill stay with the 17 and keep you posted.. I have another question. I dont mean to be a nag, but I have gashes on my brakes.. they are really torn up, and i just had them replaced. I will post a pic shortly, but they also are able to move 4-6mm back and forth. Almost to the point of where I can remove them from the bottom. I compared them with a friend and his didnt move so much. Just wondering if they could be rubbing my cb, and like, I dont know.. Stopping it or something? Maybe the cause of the gears stripping? I dont see any adjustments to move them tighter or anything, just the adjustment to grab tighter..
 
You would see marks on your bell if they were rubbing.

I'd suggest getting the RPM center skid. Fairly cheap and keeps rocks and whatnot from hitting your disks. I got one on mine after having one of my disks busted by something. Been fine since.

The only reason I was geared how I was geared was due to melting the center out of spurs in second gear. It just put too much strain on the slipper after a tank or so and the engine had so much torque that it overpowered the slipper. I will probably try upping the bell to 17T as well on mine, but honestly, it does really well with 16/47 for where I run, so I may not. I spend a lot of time in grass which strains things a bit more than dirt/pavement.
 
i see, its probably from rocks and what not hitting it. I'm going to look into the skid plate. I didnt see any marks on the housing, so I dont think its there. I just wasn't sure. I spend lots of time in the grass, I'm not so confident on pavement, and go to a huge field to run most of the time, so ill probably go to the 47/16 soon, but for right now I'm waiting on the metal 47 to arrive. Thanks for all the help, I really appreciate it. Lets hope that i can get this gearing right so I can run before the summer is over.
 
I ran a few more tanks through mine today, grass, pavement and a small lime pile. The more the LRP runs, the stronger it gets. I have to have at least 1.5 gallons through it by now. The 16/47 steel spur seems to be holding up just fine. The more I run it, the more I think I'll try a 17T bell as it's so punchy on the low end and in the grass, if I'm hammering it pretty good, it will pull an uncontrollable wheelie when it slams into second gear. The cartwheel for about 30 feet. lol
 
Update, I got my metal 47 spur today, installed it and truck ran well for one tank of fuel. It was running at 230℉ is that in range? Anyway, super stoked that she didn't melt her gear out, hoping to do some more running today.
 
230F is good. 210-260 is pretty good. Much more or less and your probably causing damage.

I ran a few more tanks through mine yesterday. Was 78F outside, but I was running in grass that nearly touched the center of the chassis... lazy township doesn't mow very often. Still didn't get over 245F with my LRP28 after quite a few high speed runs with 16/47 and seems to be holding up really well.
 
Cool.. I didn't get to run mine today, work put us on 12 hour shifts.. I'm hoping to get her out in the next few days.
 

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