Air filters

[Grimace]

I know this has been covered, but bear with me. I am a new guy, obviously, and this is my first yamaha. I am rebuilding a basket-case 79 xs1100, and the previous owner caught the airbox on fire. After reading alot of articles, I determined the stock airbox in a pain. One reason is the amount of work it takes to remove it. The other is the fact that everything in mine is melted.

My question is this after that long ramble: What do I need to do to switch to k&n style air filters? WHat vacuum lines need plugged, and what needs to be deleted? Thanks in advance,
Justin

[John]

There are no vacuum lines to the airbox, but on a 78-79 there are two small carb vent hoses and one large crankcase vent hose attached to the airbox. The carb vents must not be blocked off. You can install a Y type vacuum fitting and a small filter on the end of the fitting, and tie the whole thing up out of the way. The same for the case vent hose. Put a filter in the end of it, and tie it off out of the way. The filters are to allow the yucky stuff out, but keep the critters out of the carbs and crankcase. Personally, I prefer the airbox with an aftermarket filter, either UNI or K&N...your choice. I use the UNI part number NU2244. I have had my carbs off so many times that they are attached with velcro now and I can get them in and out quite quickly. The airbox doesn't need to be removed to get the carbs out. Just remove the lower half of it, and then it can be slid forward a little to get it of the front mount, then push it downand back. it will give you ample clearance to get the carbs out.When they are free of the intake boots, slide them tothe leftto access the throttle cable. It is very easy to remove the cable, and the carbs after that. A little lube on the boots will help during re-assembly. Re-connect the cable the same way you removed it. After a few attempts you'll have it down.

[andreashweiss]

I agree the stock airbox is what the Yamaha engineers designed for the xs1100. I have had nothing but trouble on xs1100's that did not have the stock airbox. K/N filter in the stock box simple once you set the carbs up they need very little work I have NEVER removed my carbs from my 79f and I bought it brand new. Keep them clean change the filters in the tank,drain fuel out of carbs for winter storage etc.

[Street_Rat78]

andreas

Did you get my email reply on the spare parts you have for sale?