YAMAHAOriginal OEM Yamalube Yamabond 4 Silicone Based Liquid Gasket Yamaha Part# Acc-YAMAB-ON-D4 - (1) 2.5 oz Tube

I used this to seal four engine cases, a Suzuki four stroke ATV and three two stroke Kawasaki jet skis. Great stuff, seals great, perfect consistency and fuel resistant.

Works well for aircooled VW cases.

I was rebuilding a robin 2pg engine and had to split the lower case to change crankshaft bearings. This stuff seals good for those jobs that don't use a paper gasket but needs a liquid gasket. The stuff only dries where the air isn't present. A very thin layer in my case still squished out inside and out. I actually had to take it all back apart again to adjust bearing shims and applied less during the final installation.Seeing it squish out just a little bit though verifies you have enough between the mating surfaces.

WORKS GREAT

I use this on all my motorcycle engine rebuilds to seal the cases. Apply on both halves and bolt it together. Best sealant on the market. I’ve never had a leak and will never use anything else. The price is a bit more than other silicone sealants, but having the re-split cases to fix a leak is much more expensive.

I discovered Yamabond when I was a Yamaha tech in the 90's. It's all I use from then to now. It blows every other RTV out of the water, both in sealing and cleanup. If you ever have to open something up sealed with Yamabond, you can clean it off with a shop rag. It will ball up and roll off. No need to get out the razor blades and chisels and gouge the sealing surfaces.Bonus points for NEVER curing in the tube. Nothing worse than thinking you have sealant at midnight just to learn you have a hardened tube that solidified. With this stuff you get ever drop. Even if it takes a year to use it.It and Yamabond5 (and 6B now) are all I use. Cost more money but they flat out work.

Used this in my clutch install and top end rebuild in my VTX1800. Honda recommends their sealant, but Haynes said you could use this as well. I used too much on the clutch cover, but it sealed fine. Used it very thinly on the rocker covers, and went much better, no leaks and none squeezing out. I tested it to see if it would harden when bathed in oil. I put a dab in a lid and poured 10w/40 on it in the lid. Hardened up just fine. Like it better than silicone,

I used Yamabond on two valve covers on my Craftsmen GT6000 garden tractor's Kohler engine. It's gone thru several hours of mowing and other Spring tasks, and so far, no leaks.It was easy to open and use. Also, I like the fact that the cap attempts to seal the open tube, potentially keeping the sealant gooey for a longer time. That said, I hopefully won't have to use it ever again. :-)