[fabio]

Hi everyone,

I fired up the engine on the VFR the other day and I noticed that one of the downpipes was running a good bit cooler than the rest. I have taken the rad off of this bike before and drained and refilled the coolant system and the mounts for the rad are all in proper order. However the fan housing seems to lean on and cut into the spark plug cap of the cylinder 2 (front right cylinder).

Yesterday while the engine was running I noticed that there was a constant and fast flickering yellow spark in the rip that the housing had made in that plug cap. I suppose the electrical charge wasn't going to the plug and thus the cool running of THAT downpipe. I turned the engine off anyway and need to rectify this. I can replace the HT lead and/or plug cap but either way it could happen again if the fan mount is going to lean on it.

Any opinions? The attached picture might help show you all what is going on.

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[tdmtom]

fabio, on 06 February 2012 - 06:32 PM, said:

Hi everyone,

I fired up the engine on the VFR the other day and I noticed that one of the downpipes was running a good bit cooler than the rest. I have taken the rad off of this bike before and drained and refilled the coolant system and the mounts for the rad are all in proper order. However the fan housing seems to lean on and cut into the spark plug cap of the cylinder 2 (front right cylinder).

Yesterday while the engine was running I noticed that there was a constant and fast flickering yellow spark in the rip that the housing had made in that plug cap. I suppose the electrical charge wasn't going to the plug and thus the cool running of THAT downpipe. I turned the engine off anyway and need to rectify this. I can replace the HT lead and/or plug cap but either way it could happen again if the fan mount is going to lean on it.

Any opinions? The attached picture might help show you all what is going on.

When you replace the HT lead can you move the fan housing/rad to clear the lead, or route the HT lead so it is clear of the fan maybe a longer lead will do it.

[CBR 46]

I had a look at a diagram and the lead seems to be routed as recommended by Mr. Honda.....so, it looks to me like there's a problem with the rad mounting resulting in the chafing of the HT lead. You'll need to resolve this before replacing the HT lead to prevent a recurrence.

[fabio]

Mr Honda did make the rad and HT lead a tight fit. Maybe if I can move the rad a couple of mm's it'll be ok.

[BONZOID]

Nev, are you sure the rad mountings are OK? Nothing loose/bent/strained/broken, etc.? Any play in the rad mountings?

[fabio]

Pretty sure they're good...will check them again though...

[The Mex]

Odd seeing such a tight gap, and it will cause the fault to reoccour...

A temporary solution would be to use insulation tabe around the HT lead as this will help it to not move about and reduce the cutting being done.

[evoblade]

Did the bike maybe get a knock at some point and the rad/fan has shifted slightly?

[fabio]

No sign of any crash damage to it at all but on the VFR forums one or two have said that even if you drop it off the sidestand by mistake it can knock the rad mountings by a couple of mm's. This could be it. I'll move it forward ever so slightly and hopefully that'll solve it.