My dad and I each got one of these last year and installed them on are nytros and they get to about 7800 rpm and then bog and act up. We replaced them and got new ones thinking it was just a bad product but then the new ones still do it. Any one out there have this problem and or know what might be the fix.
Jacobson roll over valve problem
- Thread starter Yammyboy
- Start date
I just went and tried grounding it to the battery and didn't change a thing but then I tried unplugging the valve to see it it was the valve part or the tether part and with the tether still plugged in it still acted up but if you unplug the tether it stops so its gotta be something to do with the tether part of this product not the valve
I dont see how these would have any effect on the RPM of the engine. I have the older style without the new electronic control module however and have never had issues with the one I bought from OFT. It is based off the same valve. Sounds like you mave have a more serious intake problem.
You are posiive that the sleds run fine above 7800 Rpms without the valves installed? Have you checked to see if your air cleaner is clogged with oil prior to installing the roll over valve that would prevent enough air to get into the throttle bodies? Have you checked the spark plugs lately?
Are you sure the valve have power while the sled it running. if they dont have power they close obviously and there will be a increase in back pressure inside oil system inside the engine that might cause this but i would think an oil line running back to the tank would explode before it would cause the engine to bog if the egine is revving that high. Keep us posted when you find out what is going on.
You are posiive that the sleds run fine above 7800 Rpms without the valves installed? Have you checked to see if your air cleaner is clogged with oil prior to installing the roll over valve that would prevent enough air to get into the throttle bodies? Have you checked the spark plugs lately?
Are you sure the valve have power while the sled it running. if they dont have power they close obviously and there will be a increase in back pressure inside oil system inside the engine that might cause this but i would think an oil line running back to the tank would explode before it would cause the engine to bog if the egine is revving that high. Keep us posted when you find out what is going on.
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It's runs perfectly fine when it's not installed or if you unplug it all so it's basically not on there .
B
BigFish BC
Well-known member
my tether part quit working last year still cant find why no broke wires fuse good
If I can't get mine figured out I will be most Likely be buying one if yours sorry for kinda making your product sound like its got a problem but does not
OK, now you have "my" attention.
All last season I was chasing down a bizarre "bogging" issue with my Nytro. I thought it was something weird in the MPI Gems controller.
But.
I had also installed the new upgraded Four Stroke Solutions High Performance Electronic Roll-Over Valve Control Module (ROVCM)
Now I am WONDERING if I might have been looking in the wrong direction.???
All last season I was chasing down a bizarre "bogging" issue with my Nytro. I thought it was something weird in the MPI Gems controller.
But.
I had also installed the new upgraded Four Stroke Solutions High Performance Electronic Roll-Over Valve Control Module (ROVCM)
Now I am WONDERING if I might have been looking in the wrong direction.???
T
towerrigger
Well-known member
The ones Yammyboy is using are not the Jacobson valves, they are the knock off's from Yamaha. Is it MPI that is making the kits for Yamaha?
B
BigFish BC
Well-known member
Guys,
If they are my kits (Four Stroke Solutions), please feel free to contact me! I have a 2 year warranty on them and can get you taken care of.
Bill
mine is a oft one & iam in no way complaining about it,i have not contacted oft yet was just trying to figure it out myself dont think its anything serious.
No, I have an original.
Just been chasing after a odd problem with "bogging" on the supercharger for months now and have not been able to nail it down, and this was something I had never considered. Really doubt this is the problem, but its one more thing I can CHECK on just to be SURE.
mine is a oft one & iam in no way complaining about it,i have not contacted oft yet was just trying to figure it out myself dont think its anything serious.
I bought one from OFT and had a tether that was sticking and not shuting down the motor, talked to them and they took care of it. GREAT SERVICE!!
will be buying one for my sons new used Phazer.
The problem is solved thanks to bill Jacobson. It was the relay and just to be clear it was the yamaha/MPI tether roll over valve.
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