RVF400 NC35 ongoing problem

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
Post Reply
User avatar
micpec
Site Supporter
Site Supporter
Reactions:
Posts: 2137
Joined: Sat May 03, 2008 9:11 pm
Bike owned: NC35’s, NC30 sold, MC34 many
Location: The Netherlands
Re: RVF400 NC35 ongoing problem

Post by micpec » Wed May 22, 2019 7:51 pm

Suzuki416 wrote:
Wed May 22, 2019 7:07 pm
Also agreed - these plugs are rubbish when they get wet. Don't buy new ones yet - pull the old ones and stick them on the hob to Burn the fuel off. Then if you have the option ultrasonic clean them. Then try again.
Ultrasonic clean spark plugs...? Really? I never ever heard of doing that before.
"Action without Philosophy is a lethal weapon; Philosophy without action is worthless"

Travis
Settled in member
Reactions:
Posts: 55
Joined: Mon Jan 28, 2019 8:22 am
Re: RVF400 NC35 ongoing problem

Post by Travis » Thu May 23, 2019 7:22 am

Speedy wrote:
Wed May 22, 2019 3:39 pm
These plugs really don't like being flooded! Some say that you can burn the fuel off with a blow torch, or on the gas hob and then get a wire brush to get all the soot off them.
As you said earlier, try the plugs from your VFR and see what's what.
P.s. Pull all 4 plugs off from the RVF at the same time, so that if there's any fuel in the cyclinders it'll have time to evaporate, then get the others from the VFR; maybe get it running for a couple of minutes, before pulling them.
Good luck!
Thanks, the odd thing is, they are SO new, Brand spanking new, I fitted them and then tried to start the bike ONCE and it flooded, so the entire life of the plug is now ruined, from being flooded once. they arent even sooty, they just got drowned in fuel, and never ignited anything so never got to the stage of what a Rich over fueling plug looks like, all blacked and sooty, these plugs look perfectly clean, they just got drenched in fuel (the thing they are designed to ignite) and this apparently killed them. Boggles the mind that a item that is literally designed to be exposed to fuel (fuel vapor at least) can be rendered ineffective from having too much fuel liquid on them. its like a gum boots that dont keep your feet dry, because they were exposed to too much water, when their entire purpose, is to be around water. The plugs are designed to burn fuel, yet the thing they are designed to be around, also destroys them. Im hesitant to spend money on plugs, so Ill go thr route of trying the VFR plugs as suggested Ill do so when they relatively warm from idling in the VFR prior. My weekend plans are developing lol.

Thanks again for the very appreciated input.

Suzuki416
Settled in member
Reactions:
Posts: 220
Joined: Fri Aug 26, 2016 10:17 am
Bike owned: 3 x NC35, 3x NC24, NC29, RC46
Location: London
Re: RVF400 NC35 ongoing problem

Post by Suzuki416 » Thu May 23, 2019 7:42 am

The plugs are designed to ignite a fuel vapour not go for a swim...taking them out, hold the cap end with pliers over the hob for a couple of minutes does clean them. They are a precision instrument that has a narrow range of comfort..

Travis
Settled in member
Reactions:
Posts: 55
Joined: Mon Jan 28, 2019 8:22 am
Re: RVF400 NC35 ongoing problem

Post by Travis » Thu May 23, 2019 7:51 am

Suzuki416 wrote:
Thu May 23, 2019 7:42 am
The plugs are designed to ignite a fuel vapour not go for a swim...taking them out, hold the cap end with pliers over the hob for a couple of minutes does clean them. They are a precision instrument that has a narrow range of comfort..
ha ha, and Swim they did! nice simple explanation, appreciated :) the carbs are sorted now, so they should not swim again.

Travis
Settled in member
Reactions:
Posts: 55
Joined: Mon Jan 28, 2019 8:22 am
Re: RVF400 NC35 ongoing problem

Post by Travis » Fri May 24, 2019 2:33 pm

I bit the bullet and just went to the spares shop and picked up 4 brand new ER9EH NGK plugs, i will pop them in the weekend and revert. Im hoping you are all right, and this is just fouled plugs! Thanks again.

User avatar
micpec
Site Supporter
Site Supporter
Reactions:
Posts: 2137
Joined: Sat May 03, 2008 9:11 pm
Bike owned: NC35’s, NC30 sold, MC34 many
Location: The Netherlands
Re: RVF400 NC35 ongoing problem

Post by micpec » Sat May 25, 2019 11:15 pm

Dont forget to check the correct electrode gap before fitting the new plugs in.
"Action without Philosophy is a lethal weapon; Philosophy without action is worthless"

Travis
Settled in member
Reactions:
Posts: 55
Joined: Mon Jan 28, 2019 8:22 am
Re: RVF400 NC35 ongoing problem

Post by Travis » Mon May 27, 2019 7:42 am

micpec wrote:
Sat May 25, 2019 11:15 pm
Dont forget to check the correct electrode gap before fitting the new plugs in.
Thanks, I will do so, planning on doing this tonight, this weekend I caught up building my Ducati Pantah 500Sl, which also developed spark problems, which I since managed to fix so I had no time for the Honda. Out of interest, and exert from the Haynes Manual for VFR/RVF 400's.

"Spark MUST be a THICK blue line, if a thin yellow spark is observed, further investigation is required" So apparently even Mr. Haynes new something I didnt about RVF's" I really praying the new plugs sort this out.

I will check how the new plugs spark outside the bike before installing them, as currently i have a thin yellow spark, not the thick blue one Haynes speaks of.

Travis
Settled in member
Reactions:
Posts: 55
Joined: Mon Jan 28, 2019 8:22 am
Re: RVF400 NC35 ongoing problem

Post by Travis » Tue May 28, 2019 10:39 am

Update: Installed new plugs, sprayed some fuel into the carb throats. absolutely nothing. Not one single hint of ignition. All plugs fire with a WEAK yellow spark. Took the same new plug, stuck it in my VFR plug lead, grounded it and observed the spark, its thick and blue. I assume this means the coils are not working properly? any advice? Thanks!

magg
Senior Member
Reactions:
Posts: 1772
Joined: Mon Sep 20, 2010 11:55 pm
Bike owned: VFR400
Location: Blue Mountain NSW Australia
Re: RVF400 NC35 ongoing problem

Post by magg » Tue May 28, 2019 11:57 am

Measure voltage on Black/White wire at ignition coils, should be same as battery voltage with ignition on and run/stop switch in RUN. If you connect the light green wire and green/white wire coming from the ignition unit to earth, you will bypass all the safety interlocks. Does this improve ignition spark?

BEWARE THE ENGINE WILL NOW START IN GEAR NO MATTER WHAT.

Travis
Settled in member
Reactions:
Posts: 55
Joined: Mon Jan 28, 2019 8:22 am
Re: RVF400 NC35 ongoing problem

Post by Travis » Tue May 28, 2019 1:29 pm

magg wrote:
Tue May 28, 2019 11:57 am
Measure voltage on Black/White wire at ignition coils, should be same as battery voltage with ignition on and run/stop switch in RUN. If you connect the light green wire and green/white wire coming from the ignition unit to earth, you will bypass all the safety interlocks. Does this improve ignition spark?

BEWARE THE ENGINE WILL NOW START IN GEAR NO MATTER WHAT.
insightful suggestion, thank you, will try this and see. at this stage im tempted to buy new coils :(


Post Reply