intake boot repair?

I was wondering if any one has tried using high temp clear coat to seal carb intake boots. I am asking because I am have problems with high rpms and erratic idle. Carbs are clean and pass clunk test and also bench synced. Any other suggestions on intake boot repair would be greatly appreciated.

 

Be sure they pass the peck test too.

 

You can make a good looking repair using bicycle innertube & RTV.

 

In a lot of cases, the obvious cracks in the intake manifolds do not go all the way through.

In that case, simply packing them with black high-temp RTV works quite well, even without "oversleeving" with the innertube.

 

the first maxim i had was brand new and kept for 8 years. 7 years later i coated with permatex #2. all the boots were cracked BAD. by the end of year 8. the permatex itself was drying out and cracking.

resealing the boots is easy. but sealing those cracks right at the base that mounts to the engine is kind of a PITA.

 

Good news, I don`t think I have problem with cracked intake boots. I did vacuum leak test with unlit propane torch and found no leaks. I still have problem with rough idle after bike warms up.
I also wondering if improper fuel mixture could be cause of rough idle. As I mentioned carbs were cleaned and bench synced.

 

Bench sync' puts them in the ball park, you have to vac' sync'.

 

also the smaller and heavier (two factors that play against one another) the object you use for the bench sync the better. I like small steel shot (about 1/8th" diameter) or the balls out of skateboard bearings. The closer to closed the butterflies are when the BB's drop the more accurate simply due to some Jr High trig and the fact that the butterflies are scribing an arc. You want to watch them closely and have the carbs tipped a bit (all together on the rack, installed FLAT on the rack) so the balls do fall through the widest part of the opening and don't get hung up off to the side.
Just a few little tips is all.

Big fitz, though I am fortunate enough to have intact manifolds on my Seca I've done that for other bikes. I call it the RTV massage.
Get all of them in front of you at once and get ready to get messy. Clean well with alcohol and let dry. It's easier to clean up one mess when you're all done vs trying to take the others off the bike with hands covered in gasket maker.