Temp gauge
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I kno, thing is this barrel & head are different from the ones I had all the troubles with last year...
Even weirder, I’ve topped up the radiator and it hasn’t lost coolant again! I have been keeping the revs low until I can do some exploratory surgery on the top end. I’m wondering if it’s a pinhole in a pipe maybe? Combined heat & pressure/revs
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Always been changeable and problematic but good solid light tan plug all through the range ATM
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Always been changeable and problematic but good solid light tan plug all through the range ATM
Can anyone with a multi metre please help me? I need to have someone measure the voltage coming out of the temperature sender wire, to see if it’s 12volts. Just put the red probe to the wire and earth the black...
I only have 3.8 volts and I’m sure it’s not right. Probably a problem with the gauge wiring, but I need to know if it should be 12 volt before I can remedy any faults...
Cheers peeps! -
Can anyone with a multi metre please help me? I need to have someone measure the voltage coming out of the temperature sender wire, to see if it’s 12volts. Just put the red probe to the wire and earth the black...
I only have 3.8 volts and I’m sure it’s not right. Probably a problem with the gauge wiring, but I need to know if it should be 12 volt before I can remedy any faults...
Cheers peeps! -
Please, if anyone can do this it’ll be a big help! Just turn on the ignition. don’t need to be running and check the voltage...
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@SpookDog I would but I don't run stock clocks and therefore my sender is completely different.
I thought it ran off impedence though.
Yeah, the current passes through the gauge to the temp sender, which is basically a variable resistor that is changed by heat. The hotter it gets the less resistance there is and the temp gauge needle goes up...
It’s ok now anyways. I took apart the Rev counter unit to get at the gauge and found out that there are two resistors in the circuit. So I think the voltage is right. Now all I gotta do is get a thermometer to set up the circuit in a bowl of 80degC water. That should be where it hits red on the gauge according to my thinking 🤪 it means that the thermostat is wide open but the coolant temp isn’t being dumped by the radiator. After that comes meltdown...
I’m hoping I can change the needle position by changing the resistor/s on the gauge to properly reflect temp. At the moment normal running temp is 5mm above the C lowest position. Which is not very helpful... -
Old thread alert! 🤪
Yep, turns out I was running lean as a whippet. 17.5 pilot, 210 main and needle on the 2nd groove. Whereas the correct jetting for my carb is 25 pilot, 240 main and 4th groove from top!...
I live and learn at my own pace it seems
I never thought that jetting could be ‘year of carb’ specific. I thought all tm28mm flatslides were the same ‘body’ and the jetting was different because of the barrel porting in different years/iterations. Never really thought about different, say, powerjet jet sizes which are cast into the body, not a brass screw threaded jet. Or the starter jet? Or air jet? I always tried to jet it to the year of the bike!!
Mind you none of my problems should affect anyone who’s bike is righteous, not a mishmash of bits and blobs! 🥴
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Old thread alert! 🤪
Yep, turns out I was running lean as a whippet. 17.5 pilot, 210 main and needle on the 2nd groove. Whereas the correct jetting for my carb is 25 pilot, 240 main and 4th groove from top!...
I live and learn at my own pace it seems
I never thought that jetting could be ‘year of carb’ specific. I thought all tm28mm flatslides were the same ‘body’ and the jetting was different because of the barrel porting in different years/iterations. Never really thought about different, say, powerjet jet sizes which are cast into the body, not a brass screw threaded jet. Or the starter jet? Or air jet? I always tried to jet it to the year of the bike!!
Mind you none of my problems should affect anyone who’s bike is righteous, not a mishmash of bits and blobs! 🥴
@SpookDog that's interesting. So what you're saying then is though my bike is 240 main jet as standard, if I bought an older carb which had 210 in it I would have to keep the 210 in it? I honestly thought as you did, that the change of jetting was down to porting, exhaust restriction or even different ypvs timing and certainly not different carb internals.
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@SpookDog that's interesting. So what you're saying then is though my bike is 240 main jet as standard, if I bought an older carb which had 210 in it I would have to keep the 210 in it? I honestly thought as you did, that the change of jetting was down to porting, exhaust restriction or even different ypvs timing and certainly not different carb internals.
