07 XB 12. Just got back from a 1hr ride and around the primary cover it sounds like something is boiling. I did notice that the fan came on a couple of times while i was riding, witch it hasnt done before. Everything seems to be fine, clutch works fine, goes into gears fine, but just concerned about the boiling sound. THKS for youre input
might be time to change out the primary fluid; 1 quart fills it up just below the bottom of the clutch pack.
i think ive had the oil in my swing arm boiling a few times after an hours ride in 100+ degree heat
when it is hot,100+ degrees, my breather smokes like a chimney after a hours ride
As you are doing the fluids check the Air Vent coming up from the Transmission. Make sure there is no kinks or it is melted from the Heat or clogged. Amsoil 75/90 helps with the Heat issues due to no cooler is on the Transmissions of the V Twin Engines. The 2010 fan Program works well for that problem. It does run the fan a Lot but it's cheaper to replace a worn out fan than all the other problems Heat Issues will cause to an Engine, & Transmission. Sometimes also when some wash the bikes the Rubber Boot where the Clutch Cables adjuster is covered gets sloppy or burned over time a little water can get in there slip inside the cable housing and cause the same problem. If it's milky that can raise the Temperature also. MOST likely it's just heat issues and with Transmissions some clean Fluid helps every 2,500. miles. Also if you have fumes OR some smoking issues coming out of the Rocker Covers PCV valves area OR a Breather Re-route you might want to replace OR at least check the PCV valves & seals in the Top of the Rocker covers they can get clogged and they are known to melt a little causing a deformality in the pcv check assembly causing it to do exactly what you are describing. It won't hurt to check that so Keep it riding! *Jimi
i heard a similar sound from mine, decided it was actually fuel boiling in the lower end of the reservoir,i don't notice as much when there is plenty of gas in the tank,
^That^ ....rest easy.i heard a similar sound from mine, decided it was actually fuel boiling in the lower end of the reservoir
I think it would be pretty hard to boil the oil.... My vote goes for boiling fuel which is common on the XB series bikes.
RSS, heat barrier line inside & underside of frame, possibly ceramic coat headers, should help with heating fuel and keep your leg & seat cooler as well :-)
Notro did your Fuel OR Cel light come on before the boiling noise started? I didn't think that anyone would run the Fuel that low due to the Cost of the Fuel parts. I've never run my bike that low on fuel before. It's possible that when that low it can make a boiling noise.I've seen Primary Vents boil and Fume due to Heat Issues Etc..Usually a repair was on the way from that. Low Fuel is Really bad for the fuel pump though. The fuel keeps the pump cool for longer life. Hope that is all that it was.*Jimi
from what i can remember i've had both boil at one point; i know when it was 100+ degrees my breather would end up smokin like a hibachi grill most all the time :D
seems like my swingarm as gotten hot a few, and def my gas tank on occasion. if ur trans hose gets pinched, the fluid finds its way up the clutch cable and u end up with less than a quart in ur primary, which ends up hotter on long rides
yep same herei heard a similar sound from mine, decided it was actually fuel boiling in the lower end of the reservoir
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