There are numerous bike dismantlers. I'd search them all for that part. Good luck!
2009 TMax overheating issue
Hi, I finally went all in on figuring out why my TMax I bought last summer from a guy for $3500 is overheating. about 5k miles on it.
The outlet pipe for the fast idle plunger is rusted through. The hose attached to it partially covered it, but I'm sure I was slowly losing coolant when the bike came up to temperature. I'd lose coolant and then it would overheat. I never saw anything leaking out though.
![Water Household hardware Fluid Finger Liquid]()
Anyway, I'm glad I found it and hope this info might be useful for others who are having overheating issues.
Finding the part to replace it is going to be my next challenge. I found a whole carb on ebay for $160. I can't find anyone offering just the fast idle plunger. Anyone know of a source?
If this part was corroded through from the inside, I'm a little nervous what the rest of the system looks like inside. I think it probably sat with old coolant in it for a long time.
Cheers!
-Troy
The outlet pipe for the fast idle plunger is rusted through. The hose attached to it partially covered it, but I'm sure I was slowly losing coolant when the bike came up to temperature. I'd lose coolant and then it would overheat. I never saw anything leaking out though.
Anyway, I'm glad I found it and hope this info might be useful for others who are having overheating issues.
Finding the part to replace it is going to be my next challenge. I found a whole carb on ebay for $160. I can't find anyone offering just the fast idle plunger. Anyone know of a source?
If this part was corroded through from the inside, I'm a little nervous what the rest of the system looks like inside. I think it probably sat with old coolant in it for a long time.
Cheers!
-Troy
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Update... got a whole carb from ebay and it had the "fast idle plunger" on it. Installed it last night and running great right now. Great progress!
The fast idle plunger as I understand has a kind of actuator inside that pushes a rod over when the coolant reaches a certain temperature. This rod slows the idle down. In effect, you get a higher idle speed when the coolant is cold, but then it will settle to a lower idle when the scooter is warmed up.
Because mine had a leak and coolant wasn't flowing through the fast idle plunger, my idle was really high. In fact, this helped me find the issues because I knew something was going on with the fast idle plunger based on reading the manual. However, this caused the ECU / Check engine light to go on with a fault code 37 - stuck fast idle plunger.
Now that I fixed the problem with a new fast idle plunger, I've been trying to get the check engine light to go out. The manual says this:
![Font Parallel Number Rectangle Handwriting]()
So far, I've tried...
a/ running it for more than 5 mins a couple times. still has check engine light with fault code 37.
b/ disconnecting the + terminal of the battery and letting it sit for ~25 mins. Reconnected, started it, still has check engine light with fault code 37.
I'm not sure what to do next. Any ideas?
-Troy
The fast idle plunger as I understand has a kind of actuator inside that pushes a rod over when the coolant reaches a certain temperature. This rod slows the idle down. In effect, you get a higher idle speed when the coolant is cold, but then it will settle to a lower idle when the scooter is warmed up.
Because mine had a leak and coolant wasn't flowing through the fast idle plunger, my idle was really high. In fact, this helped me find the issues because I knew something was going on with the fast idle plunger based on reading the manual. However, this caused the ECU / Check engine light to go on with a fault code 37 - stuck fast idle plunger.
Now that I fixed the problem with a new fast idle plunger, I've been trying to get the check engine light to go out. The manual says this:
So far, I've tried...
a/ running it for more than 5 mins a couple times. still has check engine light with fault code 37.
b/ disconnecting the + terminal of the battery and letting it sit for ~25 mins. Reconnected, started it, still has check engine light with fault code 37.
I'm not sure what to do next. Any ideas?
-Troy
And then there's this somewhat cryptic statement in the manual about erasing the history. I might be on to something here, but not sure.
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