Kyosho USA 1 Nitro Monster Truck 3-Speed Transmission Rebuild...need help with settings!
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- Опубліковано 28 сер 2024
- Need help with settings for the 1-2 gear cam and 2-3 gear cam. Please post in the comments how many turns you have your grub screws out, it would be much appreciated!
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If anyone out there has one of these transmissions, I'd really appreciate if you can share your 3-speed transmission settings with me! Called Kyosho and they didn't even have them! :(
I wish I could check them. I already messed with it before counting turns! Now we are in the same boat! See my my latest video. I think my issues match yours! "Is that 2nd or 3rd? Did it just jump from 1st to 3rd? Did it actually shift?" Hmm.
@@Rusty-Metal I did manage to get it shifting through all 3 gears yesterday nicely, but then it stopped again when I adjusted it a little....someone pointed out in the comments that they saw a crack in my 3rd gear cam around the 7:30 mark....that may be the culprit ! Going to replace it as i have a spare . Will post the video of the shifting working
@@TurokRC oh my lord. I should have ordered a few gears in my last order. Ugh. Sorry to hear. My gears won't be here until Monday.
Just bought one for my son for Christmas. Finished breaking it in yesterday. Put over a quart/8 tanks through it so far and kean it out a bunch before I heard the 1-2 shift 2-3 shift
Wheelies on command , so far no issues
Very similar in nature to my hpi savage xl 5.9
Mine is working great now as well, just having some issues with 1st gear stripping teeth a bit but upgrading to metal gears soon
@@TurokRC please can you post the part number?
Thanks
I own 5 of these trucks (Mad Force/USA1) with two being electric. I've owned my Mad Force Nitro for almost 5 years. Some things to note:
1-There are no and has never been any documented factory clutch settings for the shift points. Both of my nitro USA1's are still brand new and I guess I could document the settings before I do the breakin which won't be for awhile.
2-The clutch settings of one individual may not work for another because engine tune affects how the trans shifts based on RPM. Doesn't hurt to try but that should be kept in mind. I like to run lean and mean so my engines scream a bit more.
3-The trans gearing on these trucks is a rather close ratio and sometimes the 2nd to 3rd gear shift can easily be missed! Meaning, you don't hear it.
3-Yes, my Savage XL trans needs to be removed in order to adjust the 2nd gear shift point. The 3rd gear shift point can be done via the access hole in the trans case.
The best advice I can give is to disable the 3rd gear and concentrate on adjusting the 1st to 2nd gear. You can disable the 3rd gear by cranking the shift screw all the way down so the engine has to scream in RPMS to shift or, as in the case of my Savage, turn the clutch backwards. When 1st to 2nd is to your liking, move on the adjusting the 2nd to 3rd. These trans are very easy to adjust. You can leave the 2nd gear adjustment screw pretty loose, like 2 turns in from flush and it should shift pretty early then tune it in to your liking.
Remember, the engine should be fully heat saturated before making adjustments. If you adjust the clutches before the engine is fully heat soaked, your shifting will change as the engine gets hotter.
I may make a video of my experiences with this platform as it seems to be lacking any real information. For example, Hybrid is upset about the clutch bell needle bearings, I'm still on my ORIGINAL ones, you gotta lube them with bearing oil and spin the clutch bell every once in awhile when it sits. People are scared of doing that because they think the oil will get on everything/clutches. A little oil goes a long way, dry the excess. This platform has been around since about 2001! It's old but SOLID. I will never get rid of mine. That box is a keeper too!
Thank you so much for the help and insight! I did try locking the 3rd gear before but still wasn't hearing the 1-2 shift, even if I accelerated slowly. I will give it another try today though, I'm about to go hit the road and see how this performs after the rebuild.
The new 3-speed cam I ordered for the pin had it's grub set at 3 turns counterclockwise from being fully bottomed out. I'm hopeful that might be the factory settings, so going to try 3 turns out for 1-2 cam and 2 turns out for 2-3 cam. I'll be sure to post an update video!
Thanks again for all the advice!
@@TurokRC Worse case, just be aggressive with the 2nd gear and leave it far out from the bottom. These adjustments are like nitro engine tuning and a little goes a long way. I'd rather have it shift early and go from there as it's easier for me to adjust. Remember, let the engine get nice and hot, that should be about 75% of the tank but you need to actually run the truck, just don't let it idle. Best of luck and I hope you report back when it's working. Hearing these things shift through all 3 gears is so addictive!
@@lipoz-n-nitroz4012 I'll definitely report back either way! Hopefully I'll be coming back to post a video with some nice shifting sounds 😎
@@TurokRC Please do post an update video.
I thank you for the info provided thus far. I'm getting one of these trucks myself and have always had poor experiences with multi gear transmissions in RC cars.
@@SentinelGames definitely will post an update! About to hit the road and see what happens!
The metal clutch part of the third speed is cracked.
Really? I didn't notice...what time in the video was that? I did manage to get it to shift to 3rd but then it stopped again....was going to replace the 3rd gear cam anyway
@@TurokRC right at 7:30 you can see it pretty clearly right at the top.
@@DoRC wow thank you for pointing that out! I will get in there and replace that today. I'll post a video soon with the 3 speed working. Perhaps the crack had something to do with it working intermittently
@@TurokRC it's entirely possible. It could have been causing the cam to bind. It's also possibly what caused the first gear to get torn up.
@@DoRC thanks so much again...I can't believe I didn't notice that. Probably was focused on the phone filming. I've got that spare 3rd cam so will change it today. Was having a blast with this truck yesterday with the body finally on, was looking great.
Hi Turok. Great and interesting video. I have some good and interesting info for you about the USA-1 3-speed transmission. I see the problem and why. The design inside is almost exactly the same as the Traxxas Jato 2-speed transmission but with one design flaw difference compare to the Jato. I just took a look inside the original gear of my Traxxas Jato. Compare to the Kyosho gears the Traxxas gear dont use any plastic to cover the pins and that is why the Kyoshos gears causing problem. They are depend on that plastic is there to cover the pins because the pins are not close enough to do the hooking job by them self. Kyosho should have design it so the pins do the hooking directly by have the pins just a little futher back so those clutch Shoes/hooks can hook on the pins just like Traxxas 2-speed gear. I have had no problems at all with my 2-speed transmission. It have never break apart. Kyosho has done this bad design on purpose to make money on spare parts gear or they have bad designer who should get fired. The only solution as I see it is, either buy metal gears for the USA-1 or that Kyosho redesign the original gears. Hope this info was of help to you or anybody.
Oh that weird sprocket you thought was a tool, is probably the lower chain sprocket. Now all three of my gears are missing teeth. 2 and 2.5 turns would not allow shifting either. 4 seems to work but things were inconsistent. Ugh.
Thanks I realized that later lol. I was able to get 1-2 shifting with 2 turns counterclockwise from bottom on that 2nd gear cam. The 3rd I didn't get to yet due to the muffler issue. Also do ensure you're fully warmed up before trying to tune it hear the shift
Appreciate you sharing I’ve never had mine apart, love the info great video, I’ll be watching for More videos
Thank you for the video and for sharing Turok! Seems like I'm in the same issue.
I'll post an update video soon...I had a other issue with the exhaust baffling coming loose and blocking my exhaust port. Should have the part to fix it today. I did manage to get a 1-2 shift so I was almost there
Great video! Really helpful when rebuilding transmission!
Glad it helped!
Quick tip: put a drop of Loctite on the pin when assembling it next time. Will prevent it from falling out, yet you can remove it when you want to with a small pin punch.
Good idea. What I've done now is memorized which way the pin is horizontal by checking the flat side of the shaft, so when I go to adjust it it never slides out
@@TurokRC That's a good tip also! 👍
Thanks for sharing mate.
Not sure I can be any help but I own a kyosho gt 2 and its known for having 2nd gear stripping. The new parts you shown share the same for my car which was ig109b. The letter b just means that kyosho revised the material to be thicker. It did somewhat solve my issue, but see my 2nd gear chipping off. So my sense is that its the manufacturer fault from the gecko. Did kyosho even check their quality control before releasing this dam thing? What's the dam rush kyosho!!
I'll be releasing another video soon...but they definitely skimped on their QC.... The baffling in my muffler also came lose and was choking my engine as it was blocking the exhaust exit port. Spent 2 days trying to tune my engine wondering what on earth was going on. Not even 10 tanks into a new truck!
When it was working it was fantastic though.
Why is the 3rd gear cam pinned to the main shaft but not the middle 2nd gear cam? How does the 2nd gear cam grab the shaft?
Just bought one of these . Compared to a traxxas the instruction manual is terrible as far as settings go 😢
I have a mad force kruiser with KE25 engine(2010 version). I am worried it is not shifting into 2nd or 3rd gear 7 tanks out of 10 into the break-in. When should I start considering taking look at needle bearings? It uses the same chassis plates as the USA-1 and transmission.
We can see that the small metal pin insert into the gear where the cam catches it is Completely destroyed it is possible to replace it with a larger diameter made with another metal such as tungsten i use that mod on one of m'y 2 speed transmission in m'y forza .18 bugy hold just fine now never had this issue again look at the catch To See if this it is not rounded if so try mod the parts make sure its fuly opening
Irregardless of your grub screw settings, your gears will continue to fail. It's a design flaw Kyosho worked out on their GT2 platform. The revised dual shoe clutch type transmission of the race spec GT2 eliminated the failing gear cam strike plate on the inside of the gear as you experienced. In addition, the roller bearing was also eliminated from the initial transmission design they had in the GT1., which is the same one you have in your truck. It's shocking to see this 20+ year old transmission in a "New" truck. I thought they would have put the upgraded GT2 transmission in there. I had this same 2 speed transmission in a electric HPI RS4mt in 1998. When I upgraded the motor to a high power modified I noticed the gear cam strike plate began getting worn. The exact same thing happened in my Kyosho GT2. When I upgraded the engine, the cam gear strike plate started failing much faster. I then upgraded to steel gears, which fixed the problem., until I upgraded my transmission to have the 2 shoe clutch type.
I think the problem is exaggerated because of the large tires as well. It seems as thought the truck needs a slipper clutch where the chain drive is, to save the gears., but that's just my 2cents.
I posted an updated video with it working, strangely I've now been using the same gears for about 10 tanks and it's been shifting beautifully through all gears. I believe I had a bad batch of roller bearings/ 2-3 speed cams. I've now replaced both 2&3 speed cams, both needle bearings, as well as a few stripped gears. I've got a set of metal gears on the way and will post a video of the install when it arrives.
I just bought the same truck and after 6 tanks just breaking it in the transmission started to fail on me now I’m having problems finding parts
Parts can be tough to find sometimes but they do keep coming in stock
That’s the bottom gear that the chain wraps around
Thanks, yeah I figured it out shortly after 😅
Heads up the one way bearings in the clutch bell are pretty stupid. I heard that people swap them out with ball bearings for practicality. Hybrid went over it on his UA-cam video
I had no idea they could be changed, seemed like the bearing was part of the clutch bell itself
If you happen to remember the hybrid video link I'd appreciate it!
@@TurokRC ua-cam.com/video/VhYlz5bW9fE/v-deo.html He mentions it at the 1:29:53 mark. Little bag of bearings
I've been having trouble with mine not shifting at the right time, do you happen to know the clutch settings?
Still trying to figure mine out, settings will vary based on engine tune etc as well. My trans has needed some parts replacing
Those finger type cams kyosho uses were always terrible. At least they use a metal pin to grab onto but they are finnicky. Being such a small metal “finger” just wears right through the plastic once it flings out.
I've had nothing but problems with this transmission since I got it...I did manage to get it shifting through all 3 but then suddenly it stopped. Took it apart again today and both gear cams were stripped. Also the 2nd gear cam with the needle bearings fused itself to the shaft due to the needle bearings failing 🤦🏽♂️
@@TurokRC yea I know the frustration. I’ve had many madforce/crushers throughout the years. I always thought the chain was kool and hearing it go through the gears was epic but short lived. Kyosho makes some fun designs but why they kept that weak cluster of gears and not go with a more robust dedicated shoe type is strange.
@@dionisi9961 I have the parts on the way already, if I manage to get it shifting through all 3 again I'm never touching that adjustment again! Hearing the 2 shifts truly is special and makes all the headache worthwhile in the end, but only so many times I'll repeat the process.
Hello everyone here
Can you guys please tell me how to find the metal gear for the transmission? I haven’t tried my USA-1 yet. But after watching Turok’s movies I am worried about that gearbox. Can you guys give me some information thanks
csMui
You can find them on AliExpress or ebay
안녕 해요어디핀.ㄴ재품인그.
Well all rebuilt and 1st gear stripped again. This is why I avoid all these bs 2 speeds and 3 speed transmissions in rc cars. Not built well enough, all plastic, poor design and problematic. Very poor for a heavy powerful truck. I can't see it lasting even when set up perfectly.
Seriously...if you look inside the gear where the worn cam is, you'll see Kyosho tried to put a metal pin there to strengthen it or something. It's useless because the pin does nothing to help keep the cam from stripping
@@TurokRC ugh. And now I see my issue possibly. The one way on first was jammed. So it tried to be in two gears at once thus stripping first as it shifted. I ordered more one ways and another first gear. And also hardened metal ones. Those won't be here until December. And might cause more is issues, but we'll see. Unfortunate as this is a really fun truck to drive, but like this it's deriving me nuts.
@@Rusty-Metal yeah those one way needle bearings seem to fail a lot. As you may have seen from my comments below my 2ng gear cam bearings failed and fused themselves to the shaft. I think we'll have to lube them quite regularly to keep them from failing.
Where did you get the metal gears from? I might have to give those a go
@@TurokRC eBay. Just type a on the regular part number and they pop up. Only 1st and 2nd gear.
@@Rusty-Metal nice find, I just found them. Looks like they offer the 3rd gear too but it's out of stock. Definitely will have to get my hands on these, I'm sure it will save money down the road