My NC29 Airbox is melting!

[cbr_veze]

ive whipped my tank up and my airbox has started to melt right above the inlet ports to the carbs. it looks like number 4 is okay but the others have started to melt the airbox, there is something realy wrong going on here. there is a flat spot at about 5-7000 rpm or there abouts, now a freind was telling me about bandy engine having flatspots, and about positive and negative pulse. could the crabs be spitting back in the flat spot or the over run?

[cbr_veze]

i got some piccies so you can have a look.

http://i69.photobucket.com/albums/i62/f ... o-0023.jpg" onclick="window.open(this.href);return false;

http://i69.photobucket.com/albums/i62/f ... o-0024.jpg" onclick="window.open(this.href);return false;

http://i69.photobucket.com/albums/i62/f ... o-0025.jpg" onclick="window.open(this.href);return false;

[Iccle]

What does that look like from the inside and what effect is it having on your Air Filter?

[cbr_veze]

i think my air filter is ok, it didnt look burnt i dont think, but to look from the inside where it is melted, if i look around the perimiter of the bit that is melted, it looks like a spattering effect, it hasnt bubbled up like plastic does, its more of a spattering effect, then obviously realy melted in the middle of the effected area.

[leopard_pagan]

never seen anything like it.
i'd give Mr France a call.. let us know what it is.

[cbr_veze]

how do i get in touch with him?

[cbr400rrn]

Contact him on 07778628448

[cbr_veze]

maybe i have missed the melting before. i dont even think its possible how that amount of heat can come through the carbs! i just cant get my head round it

[cbr_veze]

someone has suggested to me severe overfueling. i had a listen to it today and its making a 'muffling' sound on the over run, if it was blowing back, what would it sound like. and watch normal mpg do u get? im gettin about 50-60 miles to 10 litres of fuel.

[cress87]

im gettin about 50-60 miles to 10 litres of fuel.

Crikey!

Something definitely not right there...