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Old 09-28-2010, 04:07 PM   #1
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Default How to keep a throttle servo alive in a Losi 8 T/B 2.0 ?

LOSI 8 2.0 truggy & buggy/How to keep a throttle servo ALIVE ?

Losi 8B 2.0 / dead JR 9100HVT 3 races
Losi 8T 2.0/ dead JR 9100HVS 5 Races
Losi 8T 2.0/ dead Hitec 7940TH 6 races

All electrical not gear related failer?
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Old 09-28-2010, 04:15 PM   #2
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LOSI 8 2.0 truggy & buggy/How to keep a throttle servo ALIVE ?

Losi 8B 2.0 / dead JR 9100HVT 3 races
Losi 8T 2.0/ dead JR 9100HVS 5 Races
Losi 8T 2.0/ dead Hitec 7940TH 6 races

All electrical not gear related failer?
MAKE SURE YOUR THROTTLE LINKAGE TO THE CARB IS PERFECTLY LEVEL!...AND MAKE SURE YOUR BRAKE EPA IS NOT SET ALITTLE ON THE FAR SIDE..
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Old 09-28-2010, 04:15 PM   #3
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From what I have seen JR's don't last worth a crap no matter waht you have them in.. Also the 7940's seem to have there fair share of failures deffinetaly not normal for Hitec, go and buy yourself a Hitec 7945.. Make sure you ahve your carb positioned like recomended in the manual and have the linkage level..
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Old 09-28-2010, 04:18 PM   #4
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lol, i dont know whats up with the burned up throttle servos i been running my futaba diginal servo and did trim the throttle spring so it was less stressing and i run rubber grummets under the servo and a radio tray sitffner .

and im not perfect at setting linkages up im talking about my 1.0 t by the way.

if you, have a 2.0 than get the one piece alum diff mount i tryed it on my and i couldnt get it to work at all !

so im having to rotate the carb so the boot doesnt rub the diff mount.
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Old 09-28-2010, 04:46 PM   #5
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From what I have seen JR's don't last worth a crap no matter waht you have them in.. Also the 7940's seem to have there fair share of failures deffinetaly not normal for Hitec, go and buy yourself a Hitec 7945.. Make sure you ahve your carb positioned like recomended in the manual and have the linkage level..
ya I have seen the same thing. I have a cheap hitec 965 on my throttle and it is still going strong after a season of racing. As everyone has said and will tell you it is all in the setup. Get someone at your local track that has been running losi for a biit to help you with the setup.
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Old 09-28-2010, 05:27 PM   #6
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Buy a good servo. Set your EPA's right. Follow the linkage addendum and set you're linkages correctly. Simple as that.

Try a 7955. If you kill one of those you're definitely doing something wrong.
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Old 09-28-2010, 05:32 PM   #7
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Originally Posted by CaLaBeR View Post
From what I have seen JR's don't last worth a crap no matter waht you have them in.. Also the 7940's seem to have there fair share of failures deffinetaly not normal for Hitec, go and buy yourself a Hitec 7945.. Make sure you ahve your carb positioned like recomended in the manual and have the linkage level..
X2 on the JR's. They never last. As for the 7940's they definitely aren't as tough as some Hitec's, but they will last if you set them up properly. Mine is going on a full year of racing in the truggy throttle now without one little hiccup. If I was buying now I'd get the 7945 for sure!
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Old 09-28-2010, 05:32 PM   #8
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MAKE SURE YOUR THROTTLE LINKAGE TO THE CARB IS PERFECTLY LEVEL!...AND MAKE SURE YOUR BRAKE EPA IS NOT SET ALITTLE ON THE FAR SIDE..
i would blow one servo every 5 tanks on my 8ightB and they were JR590 servos. once i did tons of research i followed the setup to the T and got the kingheads servo tray stiffener and i have a cheapo jr270 servo and have not blown one in over a gallon of fuel. also i did the dual o-rings under the rear of the battery on the servo tray
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Old 09-28-2010, 05:34 PM   #9
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i would blow one servo every 5 tanks on my 8ightB and they were JR590 servos. once i did tons of research i followed the setup to the T and got the kingheads servo tray stiffener and i have a cheapo jr270 servo and have not blown one in over a gallon of fuel. also i did the dual o-rings under the rear of the battery on the servo tray
that was the fix for the 1.0 truggy and buggy, the 2.0 radio tray sits the servos up about 3mm to fix the problem.
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Old 09-28-2010, 05:36 PM   #10
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Just follow this:

http://losi.com/ProdInfo/Files/LOS_T...ke_Linkage.pdf



And make sure your carb it not binding.
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Old 09-28-2010, 05:39 PM   #11
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i would blow one servo every 5 tanks on my 8ightB and they were JR590 servos. once i did tons of research i followed the setup to the T and got the kingheads servo tray stiffener and i have a cheapo jr270 servo and have not blown one in over a gallon of fuel. also i did the dual o-rings under the rear of the battery on the servo tray
The o-rings and tray stiffener are only for 1.0's. Not needed on the 2.0 tray. And neither of those servos are really enough for 1/8 scale. Glad to see those fixes have worked for you though. I ran the stiffener on my 1.0's without the o-rings and had great luck.
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Old 09-28-2010, 06:02 PM   #12
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u may have to trim the side guards. if the servo is hitting the guards they will fry. i have been running the same servos in both buggy and truggy for the past 2 yrs with no issues. ed if u wanna take a look at what i'm talking about i will b at the hut on sunday. i will b driving both buggy and truggy blue and pink bodies.
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Old 09-28-2010, 06:12 PM   #13
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u may have to trim the side guards. if the servo is hitting the guards they will fry. i have been running the same servos in both buggy and truggy for the past 2 yrs with no issues. ed if u wanna take a look at what i'm talking about i will b at the hut on sunday. i will b driving both buggy and truggy blue and pink bodies.
Good point. The side guards do need to be trimmed for some servos. I can tell you for sure that the 7940 needs it. Just take a dremel and shave away at the guard right where it contacts the outer lower corner of the servo. Dremel away enough material so that there is a little clearance between the servo case and the guard.
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Old 09-28-2010, 08:21 PM   #14
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u may have to trim the side guards. if the servo is hitting the guards they will fry. i have been running the same servos in both buggy and truggy for the past 2 yrs with no issues. ed if u wanna take a look at what i'm talking about i will b at the hut on sunday. i will b driving both buggy and truggy blue and pink bodies.
Not sure who you are but please stop by to chat.I need to find the solution to killing servos before my wallets killed.
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Old 09-28-2010, 09:15 PM   #15
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Lol I been running a crappy Hitec HS-645MG for throttle in my 8ight and have had no problems. Just adjust everything properly and it'll be fine.

Next trip to the track it will go out now that I say that..
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