Mini-Arg
RC Newbie
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- 9
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- RC Driving Style
Hello RCNitro Talk community!
I am new to the hobby and I have been reading a lot on this website over the last few weeks. Thank you all for the informative posts and advice geared towards nubbies. I am so far really liking nitro in general but I am having a few issues I was hoping to get some guidance on:
The Truck:
Pre-owned HPI Trophy 4.6 truggy. Probably with a few gallons run through it by the previous owner but the truggy is generally in good health.
The Current Tunning Condition:
Although I am a nubbie I think I have a relatively good/ OK tune. I followed these steps:
1. Running on 25% nitro.
2. Reset needles to factory settings.
3. After start and warm up (half a tank or so) adjusted the high speed needle in very small increments.
4. Got a high pitch sound with a good amount of smoke at full throttle and very good top speed. Based on videos I’ve seen online the car sounds great!
5. Then I moved to the low speed needle.
6. Little adjustments were needed (as the owners manual indicated).
7. I tried the “pinch” test and I seem to have an OK low end tune.
8. Again, I have a good amount of smoke at low RPMs with great acceleration.
9. Neither at low nor high speed I have excessive smoke, just a good amount.
10. The good amount of smoke and the good sound and performance of the truggy make me think I have a relatively good tune overall.
11. Notes: As suggested in a lot of posts I have (1) used a new glow plug (for medium temperature), (2) check the fuel lines for leaks, (3) checked the full charge on the glow plug igniter, (4) adjusted the idle screw to approximately 1mm. (5) I’ve sealed the back plate and carb recently following a good online tutorial. (6) I’ve removed and opened the engine and seems to be in good shape with good compression. (7) I’ve replaced the pullstart as the old one was crap and was filled with a green like oil. The new one seemed to be working well but I have (lately) noticed some oil on it again (just like the old one but much less). I have replaced the exhaust gasket as I’ve read the leak could be coming from there. The spring seems to be worn though.
The Problems:
1. Difficult Start:
It seems to be very difficult to get the truggy to start. It may be the temperature (around 50 F) but it takes me around 20 to 30 minutes to get it started with the pull start. The car started faster at 65 F and then temperature dropped and it got impossible to start. I haven’t tried warming up the engine with a hair dryer because I live in a condo so I can’t really start it up inside the house or my wife and neighbors will kill me. It was easier to start it up after resetting the carburetor needles to stock, but the more I get to a good tune the more difficult it gets to get it started.
2. Really High Speed Idle:
I’ve read that the idle is really adjusted after the high speed needle (and before the low speed needle). I followed these instructions and tried to the idle right but when I get the wheels of the ground the move pretty fast. I don’t want to touch the idle screw because it is pretty much at 1mm. If I try to richen the low speed needle I seem to lose some performance at low speeds, which leads me to believe the low speed needle was correctly set.
I have read this could be a clutch/ shoes issue, but haven’t had the chance to open it up to check it.
I am wondering if there are any connections between these issues (difficult start and high idle speed). Any comments/ suggestions/ guidance will be appreciated…..
I am new to the hobby and I have been reading a lot on this website over the last few weeks. Thank you all for the informative posts and advice geared towards nubbies. I am so far really liking nitro in general but I am having a few issues I was hoping to get some guidance on:
The Truck:
Pre-owned HPI Trophy 4.6 truggy. Probably with a few gallons run through it by the previous owner but the truggy is generally in good health.
The Current Tunning Condition:
Although I am a nubbie I think I have a relatively good/ OK tune. I followed these steps:
1. Running on 25% nitro.
2. Reset needles to factory settings.
3. After start and warm up (half a tank or so) adjusted the high speed needle in very small increments.
4. Got a high pitch sound with a good amount of smoke at full throttle and very good top speed. Based on videos I’ve seen online the car sounds great!
5. Then I moved to the low speed needle.
6. Little adjustments were needed (as the owners manual indicated).
7. I tried the “pinch” test and I seem to have an OK low end tune.
8. Again, I have a good amount of smoke at low RPMs with great acceleration.
9. Neither at low nor high speed I have excessive smoke, just a good amount.
10. The good amount of smoke and the good sound and performance of the truggy make me think I have a relatively good tune overall.
11. Notes: As suggested in a lot of posts I have (1) used a new glow plug (for medium temperature), (2) check the fuel lines for leaks, (3) checked the full charge on the glow plug igniter, (4) adjusted the idle screw to approximately 1mm. (5) I’ve sealed the back plate and carb recently following a good online tutorial. (6) I’ve removed and opened the engine and seems to be in good shape with good compression. (7) I’ve replaced the pullstart as the old one was crap and was filled with a green like oil. The new one seemed to be working well but I have (lately) noticed some oil on it again (just like the old one but much less). I have replaced the exhaust gasket as I’ve read the leak could be coming from there. The spring seems to be worn though.
The Problems:
1. Difficult Start:
It seems to be very difficult to get the truggy to start. It may be the temperature (around 50 F) but it takes me around 20 to 30 minutes to get it started with the pull start. The car started faster at 65 F and then temperature dropped and it got impossible to start. I haven’t tried warming up the engine with a hair dryer because I live in a condo so I can’t really start it up inside the house or my wife and neighbors will kill me. It was easier to start it up after resetting the carburetor needles to stock, but the more I get to a good tune the more difficult it gets to get it started.
2. Really High Speed Idle:
I’ve read that the idle is really adjusted after the high speed needle (and before the low speed needle). I followed these instructions and tried to the idle right but when I get the wheels of the ground the move pretty fast. I don’t want to touch the idle screw because it is pretty much at 1mm. If I try to richen the low speed needle I seem to lose some performance at low speeds, which leads me to believe the low speed needle was correctly set.
I have read this could be a clutch/ shoes issue, but haven’t had the chance to open it up to check it.
I am wondering if there are any connections between these issues (difficult start and high idle speed). Any comments/ suggestions/ guidance will be appreciated…..
