Author Topic: Engine pucks (Read 2011 times)

TurtleSnifferII · « **on:** February 10, 2022, 09:43:00 AM »

So I got an 80 CB650 that I replaced the engine pucks a few years ago and developed a small weeping leak. Didn't care before but now that I have the tank and stuff off might as well fix it. My question is if you are supposed to use some sealant on the rubber pucks when installing. I dont recall ever doing that and just wiped them with the engine oil and put them in.
What gasket sealer would you guys recommend?

BenelliSEI · « **Reply #1 on:** February 10, 2022, 09:57:02 AM »

Slight trace of “Hondabond”.

TurtleSnifferII · « **Reply #2 on:** February 10, 2022, 01:53:04 PM »

This one?

https://www.amazon.com/Hondabond-High-Temp-Silicone-Liquid-Gasket/dp/B006YTTV4W

Alan F. · « **Reply #3 on:** February 10, 2022, 02:29:36 PM »

Yup, just avoid using too much. Too much means the chunks that ooze out when the puck (or other parts) are put in place. Those chunks can and will break off and get into your oiling system where they can clog things up and block oil flow to things that need it.

Don R · « **Reply #4 on:** February 10, 2022, 03:04:34 PM »

Avaition form a gasket works also, use the soft setting but it has been difficult to find recently.

HondaMan · « **Reply #5 on:** February 10, 2022, 07:58:41 PM »

You may have received some incorrect pucks: for a [long] while there was confusion amongst our vendors and some later-style (1990s) pucks ended up being sold as the ones for the SOHC4 bikes. Problem is: those later ones are about 20% thinner despite being the same shape, so they weep oil (or leak it outright) soon after installation.

The correct ones are available at PartsNmore as their #01-0137: look in the CB650C section for them.

TurtleSnifferII · « **Reply #6 on:** February 11, 2022, 02:01:49 PM »

Quote from: HondaMan on February 10, 2022, 07:58:41 PM

You may have received some incorrect pucks: for a [long] while there was confusion amongst our vendors and some later-style (1990s) pucks ended up being sold as the ones for the SOHC4 bikes. Problem is: those later ones are about 20% thinner despite being the same shape, so they weep oil (or leak it outright) soon after installation.

The correct ones are available at PartsNmore as their #01-0137: look in the CB650C section for them.

Okay thanks. Going order some now along with some Hondabond. Hopefully wait time isnt too long.

Don R · « **Reply #7 on:** February 11, 2022, 02:06:56 PM »

Thin pucks are probably why my diecast leaks at the top of the engine. Fortunately, it has a frame kit.

BenelliSEI · « **Reply #8 on:** February 11, 2022, 05:58:34 PM »

Quote from: Don R on February 11, 2022, 02:06:56 PM

Thin pucks are probably why my diecast leaks at the top of the engine. Fortunately, it has a frame kit.

Don.... I also found a stud (holding down a cam cap) that was drilled and tapped right through to an air gap. Oil was drooling out through the threaded hole. A bit of blue loctite cured it....

HondaMan · « **Reply #9 on:** February 11, 2022, 07:04:48 PM »

Quote from: BenelliSEI on February 11, 2022, 05:58:34 PM

Quote from: Don R on February 11, 2022, 02:06:56 PM
Thin pucks are probably why my diecast leaks at the top of the engine. Fortunately, it has a frame kit.

Don.... I also found a stud (holding down a cam cap) that was drilled and tapped right through to an air gap. Oil was drooling out through the threaded hole. A bit of blue loctite cured it....

Yep, this is common on the earlier engines. The rocker tower's studs were drilled thru to air and then a white 'sealant' powder was applied to the threads of the studs. Often the oil slowly wicks thru the powdery sealant and drips a tiny bit: it is usually the oil from about 3 oil changes ago that makes it to the outside.

For this reason, when you have a head apart, check those holes. If they go thru, remove the studs and add some new sealant to the threads for another 50 drip-free years.

Don R · « **Reply #10 on:** February 11, 2022, 07:54:36 PM »

Thanks for the advice. I'll use it wisely.

Ellz10 · « **Reply #11 on:** February 15, 2022, 09:23:24 AM »

Quote from: HondaMan on February 10, 2022, 07:58:41 PM

You may have received some incorrect pucks: for a [long] while there was confusion amongst our vendors and some later-style (1990s) pucks ended up being sold as the ones for the SOHC4 bikes. Problem is: those later ones are about 20% thinner despite being the same shape, so they weep oil (or leak it outright) soon after installation.

The correct ones are available at PartsNmore as their #01-0137: look in the CB650C section for them.

Do you happen to know the specs of the "correct" pucks, ID & OD? Curious to see if the ones I got in my kit are the correct ones.

HondaMan · « **Reply #12 on:** February 15, 2022, 05:22:27 PM »

Quote from: Ellz10 on February 15, 2022, 09:23:24 AM

Quote from: HondaMan on February 10, 2022, 07:58:41 PM
You may have received some incorrect pucks: for a [long] while there was confusion amongst our vendors and some later-style (1990s) pucks ended up being sold as the ones for the SOHC4 bikes. Problem is: those later ones are about 20% thinner despite being the same shape, so they weep oil (or leak it outright) soon after installation.

The correct ones are available at PartsNmore as their #01-0137: look in the CB650C section for them.

Do you happen to know the specs of the "correct" pucks, ID & OD? Curious to see if the ones I got in my kit are the correct ones.

The thickness is 2.8mm at the outside bead. The 'wrong' ones from the superbikes of the 1990s are 2.5-2.6mm. The OD is the same, hence the confusion. At least one of our members used O-rings of the same size instead, and a year later it still didn't leak! I think it was on a 350F. That was a long time ago, too.

TurtleSnifferII · « **Reply #13 on:** February 16, 2022, 01:41:55 PM »

Got my pucks in the mail today. IIRC I have to remove the exhaust pipes to replace the pucks? If so I guess I'll just hold off on fixing that little weep then since I dont have fresh copper gaskets for the exhaust.

HondaMan · « **Reply #14 on:** February 16, 2022, 06:43:21 PM »

Quote from: TurtleSnifferII on February 16, 2022, 01:41:55 PM

Got my pucks in the mail today. IIRC I have to remove the exhaust pipes to replace the pucks? If so I guess I'll just hold off on fixing that little weep then since I dont have fresh copper gaskets for the exhaust.

The pucks are just underneath the top valve cover and rockers. I'll see if I have a picture of them from the CB550 for reference. They are similar designs.

TurtleSnifferII · « **Reply #15 on:** February 17, 2022, 04:44:42 PM »

Quote from: HondaMan on February 16, 2022, 06:43:21 PM

Quote from: TurtleSnifferII on February 16, 2022, 01:41:55 PM
Got my pucks in the mail today. IIRC I have to remove the exhaust pipes to replace the pucks? If so I guess I'll just hold off on fixing that little weep then since I dont have fresh copper gaskets for the exhaust.
The pucks are just underneath the top valve cover and rockers. I'll see if I have a picture of them from the CB550 for reference. They are similar designs.

So I replaced them and you were right on the money. The old ones were smaller compared to the new ones ypu can see the difference in the pics.

HondaMan · « **Reply #16 on:** February 17, 2022, 05:25:00 PM »

Quote from: TurtleSnifferII on February 17, 2022, 04:44:42 PM

Quote from: HondaMan on February 16, 2022, 06:43:21 PM
Quote from: TurtleSnifferII on February 16, 2022, 01:41:55 PM
Got my pucks in the mail today. IIRC I have to remove the exhaust pipes to replace the pucks? If so I guess I'll just hold off on fixing that little weep then since I dont have fresh copper gaskets for the exhaust.
The pucks are just underneath the top valve cover and rockers. I'll see if I have a picture of them from the CB550 for reference. They are similar designs.

So I replaced them and you were right on the money. The old ones were smaller compared to the new ones ypu can see the difference in the pics.

Yep, that's what does it! I had to re-do several 750 engines after these thin pucks first appeared, as the gaskets kits also came with the wrong ones. After that debacle, almost all of the gasket vendors simply omitted them from their kits altogether(!).

Don R · « **Reply #17 on:** February 17, 2022, 05:56:02 PM »

Vintage cb750 shows the same part number as Partsnmore. 01-0137 It's good to know the thickness that works. I recently re-used old ones rather than take the chance on new possible thin ones.

TurtleSnifferII · « **Reply #18 on:** February 19, 2022, 02:26:53 PM »

Now if only I can find the size orings for this fuel tube. I always replace these because they leak but the other side doesnt. Replaced them with viton orings which lasted longer but they werent thick enough.

flatlander · « **Reply #19 on:** July 03, 2022, 02:27:04 AM »

looks like i'm also a victim of the too thin pucks

Quote from: HondaMan on February 15, 2022, 05:22:27 PM

The thickness is 2.8mm at the outside bead. The 'wrong' ones from the superbikes of the 1990s are 2.5-2.6mm. The OD is the same, hence the confusion. At least one of our members used O-rings of the same size instead, and a year later it still didn't leak! I think it was on a 350F. That was a long time ago, too.

that's great info!
does anyone know who currently still sells some of the correct size?
i checked parts'n'more as hondaman advised but they have only 2 left in stock.

newday777 · « **Reply #20 on:** July 03, 2022, 05:09:35 AM »

Quote from: flatlander on July 03, 2022, 02:27:04 AM

looks like i'm also a victim of the too thin pucks

Quote from: HondaMan on February 15, 2022, 05:22:27 PM
The thickness is 2.8mm at the outside bead. The 'wrong' ones from the superbikes of the 1990s are 2.5-2.6mm. The OD is the same, hence the confusion. At least one of our members used O-rings of the same size instead, and a year later it still didn't leak! I think it was on a 350F. That was a long time ago, too.

that's great info!
does anyone know who currently still sells some of the correct size?
i checked parts'n'more as hondaman advised but they have only 2 left in stock.

So the ones you had that were too thin, were they 750 pucks from Honda or aftermarket?
Are we supposed to use something other than the 750 pucks from Honda?

flatlander · « **Reply #21 on:** July 03, 2022, 05:18:43 AM »

i have a 550. they were original honda, parts no. 91318300013.
have oil leaking from around the top/front of the cover. first i thought it might be the o-rings under the tappet inspection covers so i replaced them but it's still leaking. now i'm pretty sure it's those pucks.

fizzlebottom · « **Reply #22 on:** July 03, 2022, 04:56:21 PM »

Quote from: flatlander on July 03, 2022, 02:27:04 AM

looks like i'm also a victim of the too thin pucks

Quote from: HondaMan on February 15, 2022, 05:22:27 PM
The thickness is 2.8mm at the outside bead. The 'wrong' ones from the superbikes of the 1990s are 2.5-2.6mm. The OD is the same, hence the confusion. At least one of our members used O-rings of the same size instead, and a year later it still didn't leak! I think it was on a 350F. That was a long time ago, too.

that's great info!
does anyone know who currently still sells some of the correct size?
i checked parts'n'more as hondaman advised but they have only 2 left in stock.

I've used rebuild kits from 4-into-1 for my CB650 just for the rubber bits. Sizes have been correct so far and no fuel leaks for a long time. Can also recommend Randakk's.

flatlander · « **Reply #23 on:** July 03, 2022, 10:56:36 PM »

fizzle, did any of those include the engine pucks, and were they correct size?
i'm asking because you mention fuel leaks but they're not in contact with fuel.

fizzlebottom · « **Reply #24 on:** July 04, 2022, 12:44:27 AM »

Quote from: flatlander on July 03, 2022, 10:56:36 PM

fizzle, did any of those include the engine pucks, and were they correct size?
i'm asking because you mention fuel leaks but they're not in contact with fuel.

Looks like I responded to the wrong comment. Meant to TurtleSnifferII about the fuel tube o-rings.

As for the pucks, I recently replaced mine with genuine Honda bits that I got from Partzilla (https://www.partzilla.com/product/honda/91318-300-013?ref=118f5fbfa3b466942defecd37e08d6ff5fab37f7). They fit swimmingly, though I didn't measure. I probably have like 200 miles on them and everything is dry.

News:

Author Topic: Engine pucks (Read 2011 times)