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DannoXYZ · January 26th, 2022, 04:08 PM

Greetings & Salutations Dave!!!

Could be many things. Most likely some sort of vacuum-leak:

1. check rubber manifolds between throttle-body and head
2. check rubber hose between manifold and MAP sensor
3. measure MAP-sensor voltage-output with key ON/bike OFF
4. measure MAP-sensor voltage-output with key ON/bike idling
5. compare #3 and #4 with values given in manual

Most likely issue with MAP sensor, disconnected or cracked hose is common culprit for these symptoms. Might also be fuel issue:

6. how long was bike sitting before owner ran it recently? If more than 6-months, dump tank and put fresh petrol in with some PEA-based fuel-system cleaner
7. fuel pump? Follow test in manual to measure fuel-pump flow volume and pressure.
8. fuel filter? Might be implicated in #7 if flow is below limits.
9. fuel injectors clogged? There's way to measure their flow. Might be easier to just send them to https://mrinjector.us for cleaning with before& after flow-testing

10. sparks are least likely, but may be issue. Pull plugs and take look at them. Inspect spark by grounding plug onto engine and cranking. What colour is spark?

January 26th, 2022, 04:08 PM	#3
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	Greetings & Salutations Dave!!! Could be many things. Most likely some sort of vacuum-leak: 1. check rubber manifolds between throttle-body and head 2. check rubber hose between manifold and MAP sensor 3. measure MAP-sensor voltage-output with key ON/bike OFF 4. measure MAP-sensor voltage-output with key ON/bike idling 5. compare #3 and #4 with values given in manual Most likely issue with MAP sensor, disconnected or cracked hose is common culprit for these symptoms. Might also be fuel issue: 6. how long was bike sitting before owner ran it recently? If more than 6-months, dump tank and put fresh petrol in with some PEA-based fuel-system cleaner 7. fuel pump? Follow test in manual to measure fuel-pump flow volume and pressure. 8. fuel filter? Might be implicated in #7 if flow is below limits. 9. fuel injectors clogged? There's way to measure their flow. Might be easier to just send them to https://mrinjector.us for cleaning with before& after flow-testing 10. sparks are least likely, but may be issue. Pull plugs and take look at them. Inspect spark by grounding plug onto engine and cranking. What colour is spark?