Hi there all,
Does this sound familiar?
I was riding along fine when suddenly the NT turns into a bucking bronco of a ride – dies/surge/dies/surge/dies/surge (on 1 to 2 second ‘loop’) and then dies completely when I pulled over. NOT good in city traffic! Started her up again and she was fine.
I have been having this issue sporadically over the past 3,000 miles however the ‘FI’ (MIL) light has never come on to indicate any fault condition and the only error code I have been able to retrieve (see the Haynes Manual) is ‘01’ – an MAP sensor error – which doesn’t really seem to match my symptoms.
After reading lots of posts regarding the spark plug caps issues I replaced them and for good measure I changed the plug leads for silicone items as well.
I have also pulled every plug and socket I can find to clean the contacts and added a smear of di-electric grease to eliminate any poor contact issues.
However, after a few months, the bucking bronco has reared its ugly head again!
My gut feeling is that this is an intermittent fault with the throttle position sensor (TPS)
There seem to be a lot of posts about this ranging from ‘replace the whole throttle body’ (at stupid money!) to replacing the actual culprit, ie the JT7H sensor unit itself!
Now my big question is……. Has anyone done this successfully?
It would seem to me that a JT7H is, well, just a JT7H! (as fitted to many Honda cars and these appear to available from around £15 upwards) but am I wrong? Do those digits AFTER the ‘JT7H’ really signify anything of importance?
(I believe the full code for the NT700 is JT7H 40819)
Intriguingly the suggested Yamaha alternative – ISL 85 885 –00 ($33.36 on Amazon!) appears to be a JT7H with ‘40819’ stamped on the casing
The Haynes manual has a dire warning about dismantling the throttle body components and I appreciate that if the sensor were to be replaced it would have to be adjusted (on its slotted holes) to give the correct voltages at fully open and closed throttle positions.
I am not 100% sure, but I assume this is what is meant by ‘calibration’
One post also mentioned that an after market replacement TPS had its location slot in the wrong orientation to engage with the throttle body shaft. Any thoughts?
In conclusion it seems to me that there is a lot of humbug around regarding sensors (car or motorcycle) If the Manufactures can make the sensor (apparently!) specific to one model they can charge a LOT more for what in fact is a fairly generic sensor.
Any comments, observations or experiences would be welcome before my winter ‘tear down’ to address this issue and others (tappet adjustments anyone!!!)
Thanks in advance for your time, Steve P
(2008, NT700VA, 9000 ‘dry’miles from new)
Does this sound familiar?
I was riding along fine when suddenly the NT turns into a bucking bronco of a ride – dies/surge/dies/surge/dies/surge (on 1 to 2 second ‘loop’) and then dies completely when I pulled over. NOT good in city traffic! Started her up again and she was fine.
I have been having this issue sporadically over the past 3,000 miles however the ‘FI’ (MIL) light has never come on to indicate any fault condition and the only error code I have been able to retrieve (see the Haynes Manual) is ‘01’ – an MAP sensor error – which doesn’t really seem to match my symptoms.
After reading lots of posts regarding the spark plug caps issues I replaced them and for good measure I changed the plug leads for silicone items as well.
I have also pulled every plug and socket I can find to clean the contacts and added a smear of di-electric grease to eliminate any poor contact issues.
However, after a few months, the bucking bronco has reared its ugly head again!
My gut feeling is that this is an intermittent fault with the throttle position sensor (TPS)
There seem to be a lot of posts about this ranging from ‘replace the whole throttle body’ (at stupid money!) to replacing the actual culprit, ie the JT7H sensor unit itself!
Now my big question is……. Has anyone done this successfully?
It would seem to me that a JT7H is, well, just a JT7H! (as fitted to many Honda cars and these appear to available from around £15 upwards) but am I wrong? Do those digits AFTER the ‘JT7H’ really signify anything of importance?
(I believe the full code for the NT700 is JT7H 40819)
Intriguingly the suggested Yamaha alternative – ISL 85 885 –00 ($33.36 on Amazon!) appears to be a JT7H with ‘40819’ stamped on the casing
The Haynes manual has a dire warning about dismantling the throttle body components and I appreciate that if the sensor were to be replaced it would have to be adjusted (on its slotted holes) to give the correct voltages at fully open and closed throttle positions.
I am not 100% sure, but I assume this is what is meant by ‘calibration’
One post also mentioned that an after market replacement TPS had its location slot in the wrong orientation to engage with the throttle body shaft. Any thoughts?
In conclusion it seems to me that there is a lot of humbug around regarding sensors (car or motorcycle) If the Manufactures can make the sensor (apparently!) specific to one model they can charge a LOT more for what in fact is a fairly generic sensor.
Any comments, observations or experiences would be welcome before my winter ‘tear down’ to address this issue and others (tappet adjustments anyone!!!)
Thanks in advance for your time, Steve P
(2008, NT700VA, 9000 ‘dry’miles from new)