vspec problem
#1
vspec problem
Guys I need some help with my vspec. The engine is in a new losi 8ight roller and brokin normally without any issue using the heat sink method. The engine ran fine for the first half gallon after break in averaging normal temps. Very shortly after break in I noticed the engine was starting to hesitate and bog slightly about mid to upper rpm but would clear itself out once in the higher rpm range. However the engine will now stall out as i throttle upto midrange. On the box i get full the full range of throttle authority but on the track when the buggy is under any load the engine will only rev up to just under mid range and stall out. I have tried everything i can think of. Re tune, change plugs ( p3 hot ) check for leaks, change fuel filter and all to no joy. Now i should mention that when i do put a new plug in the engine runs normal for about 3 laps ( 2-3 minutes )then the whole issue starts over again.
fuel is 20% with 14 % oil
os p3 hot plug
stock engine with no change
ofna jp 4 pipe
fuel is 20% with 14 % oil
os p3 hot plug
stock engine with no change
ofna jp 4 pipe
#2
if the plugs are wearing out fast would suggest the engine is running a touch lean, try richening the mixture and try again.
#3
Tech Initiate
sounds lean, I had a similar problem. After the switch to 30% I was slightly lean.
#4
Tech Regular
I'm going to throw something else out there and I'll probably get flamed for it but, I was talking with R2 from Ofna and he was helping me tune my Vspec and my P3 using a JP4 pipe. He told me to get rid of the pipe completely. According to Ofna, the pipe creates too much back pressure and causes the motor to overheat thus pop plugs. I was going through a plug almost every race weekend. Once I got rid of the JP4, the issues went away. So if you guys want to flame me, go for it. I got my info righ from the source.
The only other thing it could be is a stretched conrod or bad bearings.
The only other thing it could be is a stretched conrod or bad bearings.
#6
I'm going to throw something else out there and I'll probably get flamed for it but, I was talking with R2 from Ofna and he was helping me tune my Vspec and my P3 using a JP4 pipe. He told me to get rid of the pipe completely. According to Ofna, the pipe creates too much back pressure and causes the motor to overheat thus pop plugs. I was going through a plug almost every race weekend. Once I got rid of the JP4, the issues went away. So if you guys want to flame me, go for it. I got my info righ from the source.
The only other thing it could be is a stretched conrod or bad bearings.
The only other thing it could be is a stretched conrod or bad bearings.
-DC-
#7
Tech Fanatic
iTrader: (19)
pipe
I'm going to throw something else out there and I'll probably get flamed for it but, I was talking with R2 from Ofna and he was helping me tune my Vspec and my P3 using a JP4 pipe. He told me to get rid of the pipe completely. According to Ofna, the pipe creates too much back pressure and causes the motor to overheat thus pop plugs. I was going through a plug almost every race weekend. Once I got rid of the JP4, the issues went away. So if you guys want to flame me, go for it. I got my info righ from the source.
The only other thing it could be is a stretched conrod or bad bearings.
The only other thing it could be is a stretched conrod or bad bearings.
Neil
#8
Tech Addict
iTrader: (7)
First Check the midrage needle and make sure it's correct. If the Midrange it too lean it doesn't matter what you do with the low end needle, it will never be correct.
Second, Your way lean on bottom and rich on top. Fatten the bottom end a full turn, bump the idle, and lean the top a hour or two and see what happens.
Third, I've been using a JP-2 pipe on my Vspec for over a year with no problems. Never tried a JP3 or 4 on it though.
Second, Your way lean on bottom and rich on top. Fatten the bottom end a full turn, bump the idle, and lean the top a hour or two and see what happens.
Third, I've been using a JP-2 pipe on my Vspec for over a year with no problems. Never tried a JP3 or 4 on it though.
#10
Tech Master
iTrader: (8)
Also seal the backplate, base of the carb and high speed needle housing with either high-temp RTV or Air-Seal sealant. You could have picked up an air leak in the engine. That's happened on one of my V-Specs. Drove me crazy trying to figure out what was going on with it.
#11
Tech Regular
#12
V Spec Setup
I run P4 plug w/2060 os pipe & the 8mm "red" carb insert..
This is a great setup for any V Spec
Also always seal your engines around the OUTSIDE base of the carb and HS needle. I use Lucky 7 engine sealent you can find on TKO's site or Carolinas Rc
Good luck
This is a great setup for any V Spec
Also always seal your engines around the OUTSIDE base of the carb and HS needle. I use Lucky 7 engine sealent you can find on TKO's site or Carolinas Rc
Good luck
#13
I ran the stock vspec with 2050, no problem at all, got all the mileage as much as in a tank......
#14
you cna't get the 2050 anymore can you?
-DC-
-DC-
#15