Newly acquired NC30 running issues
Forum rules
Please can you post items for sale or wanted in the correct For Sale section. Items / bikes for sale here will be removed without warning. Reasons for this are in the FAQ. Thanks
Please can you post items for sale or wanted in the correct For Sale section. Items / bikes for sale here will be removed without warning. Reasons for this are in the FAQ. Thanks
-
- Settled in member
- Reactions:
- Posts: 131
- Joined: Sun Mar 27, 2011 7:19 pm
- Bike owned: VFR400 NC21 Thunderbird 900
- Location: West huntspill Somerset
Newly acquired NC30 running issues
I've just got a 89 NC30, it fires up but seems to splutter and finds it a struggle to rev up cleanly past 6k.
So far I've, cleaned the carbs (carb cleaner, air compressor).
Bench sync'd the carb butterfly valves.
Checked all plugs (all between 4.8 to 5.5k resistance).
There is a leak on the exhaust at the connection between front and rear ( left seal).
The battery won't hold charge however I have ran the bike using a booster.
Choke operates effectively.
Where do I go next?
Thanks for any suggestions :)
Sent from my SM-G900F using Tapatalk
So far I've, cleaned the carbs (carb cleaner, air compressor).
Bench sync'd the carb butterfly valves.
Checked all plugs (all between 4.8 to 5.5k resistance).
There is a leak on the exhaust at the connection between front and rear ( left seal).
The battery won't hold charge however I have ran the bike using a booster.
Choke operates effectively.
Where do I go next?
Thanks for any suggestions :)
Sent from my SM-G900F using Tapatalk
-
- Settled in member
- Reactions:
- Posts: 72
- Joined: Tue Jan 05, 2016 12:23 pm
- Bike owned: NC30 Grey Import
Re: Newly acquired NC30 running issues
The carbs are really fussy. Carb cleaner and compressed air are probably not going to do it. If your getting a good spark I think a proper carb strip and clean is the way to go.Vfr400/tbird wrote:I've just got a 89 NC30, it fires up but seems to splutter and finds it a struggle to rev up cleanly past 6k.
So far I've, cleaned the carbs (carb cleaner, air compressor).
Bench sync'd the carb butterfly valves.
Checked all plugs (all between 4.8 to 5.5k resistance).
There is a leak on the exhaust at the connection between front and rear ( left seal).
The battery won't hold charge however I have ran the bike using a booster.
Choke operates effectively.
Where do I go next?
Thanks for any suggestions :)
Sent from my SM-G900F using Tapatalk
Let us all know how you get on
Good luck
Sent from my iPhone using Tapatalk
Last edited by st22041967 on Sat Mar 31, 2018 11:50 pm, edited 1 time in total.
-
- Senior Member
- Reactions:
- Posts: 1910
- Joined: Mon Sep 20, 2010 11:55 pm
- Bike owned: VFR400
- Location: Blue Mountain NSW Australia
Re: Newly acquired NC30 running issues
The engine will not run without the booster connected? If it needs the booster connected to run, what type of booster, just another 12v battery.
-
- Settled in member
- Reactions:
- Posts: 131
- Joined: Sun Mar 27, 2011 7:19 pm
- Bike owned: VFR400 NC21 Thunderbird 900
- Location: West huntspill Somerset
Re: Newly acquired NC30 running issues
Not quite, it's actually a crypton auto booster ( a massive wheeled charge/booster).magg wrote:The engine will not run without the booster connected? If it needs the booster connected to run, what type of booster, just another 12v battery.
I've not tried it without it on the battery though.
Sent from my SM-G900F using Tapatalk
-
- Senior Member
- Reactions:
- Posts: 1910
- Joined: Mon Sep 20, 2010 11:55 pm
- Bike owned: VFR400
- Location: Blue Mountain NSW Australia
Re: Newly acquired NC30 running issues
You may want to measure the output voltage of your battery booster, a massive wheeled charger/booster may produce significantly more than 14 volts when connected to an NC30 with a dud battery. Excessive supply voltage can have a detrimental affect on the performance of the ignition control unit.
-
- Settled in member
- Reactions:
- Posts: 131
- Joined: Sun Mar 27, 2011 7:19 pm
- Bike owned: VFR400 NC21 Thunderbird 900
- Location: West huntspill Somerset
Re: Newly acquired NC30 running issues
This would cause erratic running due to overheating of the charging system and possibly the components within the CDI?magg wrote:You may want to measure the output voltage of your battery booster, a massive wheeled charger/booster may produce significantly more than 14 volts when connected to an NC30 with a dud battery. Excessive supply voltage can have a detrimental affect on the performance of the ignition control unit.
The voltage is regulated at 13.8v but!
It maybe kicking out a great volume of amps than the bikes charging system.
So what your saying is try a new fully charged battery
Sent from my SM-G900F using Tapatalk
-
- Senior Member
- Reactions:
- Posts: 1910
- Joined: Mon Sep 20, 2010 11:55 pm
- Bike owned: VFR400
- Location: Blue Mountain NSW Australia
Re: Newly acquired NC30 running issues
Provided your charger/booster output voltage does not exceed 15 volts it should not be an issue. If it runs clean up to 5500rpm you may have an issue with the over speed limiter located in the speedo unit. Is the OEM speedo fitted and the 3-pin plug connected to the loom.
-
- Settled in member
- Reactions:
- Posts: 131
- Joined: Sun Mar 27, 2011 7:19 pm
- Bike owned: VFR400 NC21 Thunderbird 900
- Location: West huntspill Somerset
Re: Newly acquired NC30 running issues
That I do not know :/
Does the over speed unit effect running in neutral?
Sent from my SM-G900F using Tapatalk
Does the over speed unit effect running in neutral?
Sent from my SM-G900F using Tapatalk
-
- Senior Member
- Reactions:
- Posts: 1910
- Joined: Mon Sep 20, 2010 11:55 pm
- Bike owned: VFR400
- Location: Blue Mountain NSW Australia
Re: Newly acquired NC30 running issues
If speed limiter is not detected by ignition unit when ignition turned on, system will misfire on rear cylinders when engine rpm exceeds 5500rpm. Gear selection is not factor.
-
- Settled in member
- Reactions:
- Posts: 131
- Joined: Sun Mar 27, 2011 7:19 pm
- Bike owned: VFR400 NC21 Thunderbird 900
- Location: West huntspill Somerset
Re: Newly acquired NC30 running issues
Ok so if mines missing that's likely the cause, thanks.magg wrote:If speed limiter is not detected by ignition unit when ignition turned on, system will misfire on rear cylinders when engine rpm exceeds 5500rpm. Gear selection is not factor.
I'll take a good look tommorow.
Sent from my SM-G900F using Tapatalk