Author Topic: Need Help: 1969 RS200 MkII, Melting Hole In Piston & Crank Seal Leak  (Read 647 times)

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Offline robinkwmack

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Re: Need Help: 1969 RS200 MkII, Melting Hole In Piston & Crank Seal Leak
« Reply #20 on: November 10, 2019, 11:43:24 AM »
Hey there, sorry for the delay! I did not get any notifications about responses to this thread and I am still stuck with this issue and as one of you said, it really does defy logic. I have gone through the carb multiple times with carb cleaner and I am still having the same issue. I even adjusted the float to allow a little more fuel to see if that was the issue but nope, and ran like it was getting too much fuel.

I will start using 91 octane and change the ratio as you recommended. I have been using only yamalube as my mix oil. Going to tear into it all one more time and see if one of the vents is clogged, but I am PRETTY dang sure I have sprayed out every last crevice in that damn carb. I doubt it is the float valve sticking since when I remove the float bowl fuel will gush from the tank as normal (through the fuel line into the carb). So it seems to be refusing to let more fuel in once the float bowl is filled for the first time, when running or not. It is a true anomaly. Last thing I need to iron out before I can truly ride it more than 3 miles. Runs great except for this issue and maybe needing some new clutch plates, but that's for a later date.

Thank you all again for chipping in, hopefully I can get at least one solid ride in before it's far too cold here in Western Massachusetts.

I'll be checking back here more frequently than I have before now that I know responses don't always send notification emails.

Offline rwgibbon

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Re: Need Help: 1969 RS200 MkII, Melting Hole In Piston & Crank Seal Leak
« Reply #21 on: November 10, 2019, 02:53:20 PM »
I just finished getting a 350 GTR running and no matter how many times
I cleaned and adjusted the right carb I could not get it to run properly.

The right carb did not appear to be letting fuel get through to the right
cylinder. Even though it always had fuel in its bowl.

I finally put a different carb on it and it now is running like it should. It idols and
responds to the throttle.

No matter how good you think you have cleaned the carb sometimes there is
something in one of the galleys you just can't clean.

Have you tried swapping the carb's?

That could help identify if it is a carb problem.

Good luck and don't give up.

Regards

Randy



Offline robinkwmack

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Re: Need Help: 1969 RS200 MkII, Melting Hole In Piston & Crank Seal Leak
« Reply #22 on: January 12, 2020, 02:24:54 PM »
Alright, since global warming has decided to show its nasty head with a 65 degree day in January here in Massachusetts, I finally had some motivation to try and dive into this fuel issue again and STILL NO LUCK!!!.

So! I put on yet another aftermarket petcock, this is the second one because the stock petcok was long gone and if I remember correctly leaking. I think I just tossed it?

These are the petcocks that I Have used, has anyone used these without issue? I am starting to think this might be what is wrong.

https://www.ebay.com/itm/BRIDGESTONE-200-SS-FUEL-TANK-SWITCH-VALVE-PETCOCK-ASSEMBLY-22mm/142089114440?epid=2239374381&hash=item21152bd348:g:p14AAOSwK89ZwuER

So, I am still getting the same issue, no fuel to the right carburetor AFTER the float has been filled. The line and float will fill as they should, then I will ride the bike for 1-3 miles and an air pocket will form in the line up at the carb as if a vacuum has been formed.....But only on that one fuel line. Left carb is fine. Today I put the new petcock on, removed and VERY DEEPLY cleaned the right carburetor, thought the issue was fixed, got to a coffee shop, and walla! Air pocket is back.

Again, left carb is fine, both carbs are adjusted as they should be, bike runs like a top, just will eventually run out of fuel on the right side. (I have already replaced to pistons thank you very much, heh)

Also, tank is very much venting, I can hear it, I even drilled extra holes to be safe, this issue occurs with the cap on or off, does not matter. I am able to fill the fuel line by leaving the petcok on and pulling the fuel line letting fuel spill into the line and then plug it back in. (how I got home)

So here are my only thoughts, I bumped into a buddy of mine and he mentioned could be ignition timing is slightly off and that's causing back pressure to build up just slightly. I would think if this was the case it would not run like it does (well).

My other thought is that these aftermarket petcocks are just not meant to work with these bikes. Sadly mine is long gone so I will have to source one from Richard, or find an old crusty one and rebuild it.


If I can't get this figured out I will just be selling this bike and moving on. Heck, my dream bike is for sale  only about an hour or so away so my motivation to keep figuring out this dang issue is dwindling.

Hope to hear from some, or all of you shortly and again, thank you for all of the help thus far.

Offline BRT-GTR

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Re: Need Help: 1969 RS200 MkII, Melting Hole In Piston & Crank Seal Leak
« Reply #23 on: January 13, 2020, 12:46:08 PM »
        These two strokes can be fustrating !, I've spent months trying to cure a light load running issue without success. Can appreciate how teed off you are.

         I have one of those fuel taps and in theory the outlets/filter chamber could airlock. Try swapping the two outlet fuel tubes over on back of tap to see if the fuel issue changes to the opposite carb.

        If OK, I can only suggest checking the float on the right side to see if it is catching on the side of the float bowl. I have found the floats can vary in where they are soldered to the cross arm.  Beyond that I'm stumped.
                        Brian.
« Last Edit: January 13, 2020, 12:51:30 PM by BRT-GTR »
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I'm so glad I grew up in the 60s & 70s. I did so much stupid stuff and there's no record of it.............Anywhere !!

Offline robinkwmack

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Re: Need Help: 1969 RS200 MkII, Melting Hole In Piston & Crank Seal Leak
« Reply #24 on: January 13, 2020, 01:01:02 PM »
Hey, I appreciate the reply and thanks for appreciating my frustrations, ha. I will try flipping the fuel lines and see if if it switches sides, but leave the same fuel line to the carbs, just switch it at the tap.

I did have an issue with the left float where it had a hole in it but that was fixed, is there a way of making it so this float fits better if it is in fact catching or do I need a new float? It's just odd because if the float was catching I should have running issues, either too little or too much fuel to that side. The thing runs like a top though, just will run when cold and then won't get fueled once warmed up and ran.

Another thought I had is maybe the fuel line is collapsing somewhere? It is new and pretty heavy duty so I highly doubt it, but did notice the line gets pretty flexible once the bike is warmed up. I might remove the line and open up the carb boot hole for it a tiny bit and see if that does anything.

Any more thoughts are greatly appreciated seeing as I am kinda hitting a dead end and considering just moving back to the trusted 4 stroke thumper world.

Thanks again.

Online OldSwartout

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Re: Need Help: 1969 RS200 MkII, Melting Hole In Piston & Crank Seal Leak
« Reply #25 on: January 13, 2020, 04:29:52 PM »
If a float is catching or dragging inside the float bowl, just bend the bracket a little. I've done that a time or two.
Karl Swartout
Mooresville, IN
BS175 Roadracer. BS200RS, BS175HS
BS350 GTR

Offline BRT-GTR

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Re: Need Help: 1969 RS200 MkII, Melting Hole In Piston & Crank Seal Leak
« Reply #26 on: January 14, 2020, 07:33:09 AM »
            Another thought based on your response above. What is the internal diameter of the fuel tube you are using. needs to be at least 4mm to provide adequate fuel flow.
           We are limited in the choice of fuel tube we can use due to the diameter of the hole in the carb boot. A thick wall tube might be closing up sufficiently to restrict the fuel flow, so that's worth examining.
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I'm so glad I grew up in the 60s & 70s. I did so much stupid stuff and there's no record of it.............Anywhere !!

Offline robinkwmack

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Re: Need Help: 1969 RS200 MkII, Melting Hole In Piston & Crank Seal Leak
« Reply #27 on: January 14, 2020, 09:41:47 AM »
I can't remember the exact measurements on the fuel line but it is larger than stock due to the larger outlets on the aftermarket petcock. I did drill the carb boot holes slightly bigger but I think I might need to make them slightly larger. My thought is, everything seemed fine for while on my ride, at least, longer than usual, but once I stopped and checked after everything had warmed up, that's when the fuel stopped flowing. So I am thinking once the bike gets warm and the fuel line gets warm and pliable, that's when it might be collapsing. Now it is back to normal cold temps outside so I will try and get it warmed up to temp without freezing my ass off and see if a larger fuel line hole in the carb boot helps at all.


Problem is, I did already talk to my bank about a loan for this new (1979) bike.......Which is my dream bike, but regardless I would like to get this thing to have no issues so I can either enjoy it fully, instead of only 30 minute rides, or sell it for top dollar.

Thanks again for the help all, I will report back.

Online OldSwartout

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Re: Need Help: 1969 RS200 MkII, Melting Hole In Piston & Crank Seal Leak
« Reply #28 on: January 14, 2020, 10:01:08 AM »
Another WAG, but If you are using larger fuel line than normal, do you have it tightly clamped to the spigots on the petcock? BRT-GTR asked if it was possible that an air lock wouldn't vent the air back into the tank. I think that is the case on any bike with a sediment bowl on the petcock. The fuel doesn't come straight from the tank, but goes into the bowl first. Air would have to travel up the line, then downward into the sediment bowl, below the fuel level in it, to get back up to the tank, keeping it trapped in the line.

I have also seen plastic/rubber lines with a hairline split or slit that would allow air in, in case of any vacuum at all, but won't leak liquid out. You might try replacing that line and making certain it is clamped tightly to the petcock.
Karl Swartout
Mooresville, IN
BS175 Roadracer. BS200RS, BS175HS
BS350 GTR

Offline robinkwmack

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Re: Need Help: 1969 RS200 MkII, Melting Hole In Piston & Crank Seal Leak
« Reply #29 on: January 14, 2020, 10:39:27 AM »
Thanks for the recommendation, the fuel line is new and is VERY tightly press fitted onto the outlets, no clamps needed. The fuel line is either 1/4" ID or 3/8" ID, I do not recall exactly. I do know that it is a very tight seal. The issue seems to arise once the bike is warm, thus why I am leaning towards a collapse down at the boot. Going to let the bike idle until it's hot so I don't have to freeze my ass off and enlarge the boot fuel line hole slightly and see if that changes anything. Should have an update by tonight.

Offline robinkwmack

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Re: Need Help: 1969 RS200 MkII, Melting Hole In Piston & Crank Seal Leak
« Reply #30 on: January 14, 2020, 04:17:20 PM »
Okay, so.....I just got back from a ride, the same distance as the other day, and I am still having the issue. This is with the fuel line hole into the carb opened up a little bit more and a brand new fuel line.


BUT!!!! I have an idea........The banjo bolt on the carb is still using the original fiber crush washers........wish do weep a little bit.......I am wondering if this is my issue, if it is pulling enough air in through it to cause this problem. It would make sense because it seems to show up when everything is hot.

Offline robinkwmack

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Re: Need Help: 1969 RS200 MkII, Melting Hole In Piston & Crank Seal Leak
« Reply #31 on: January 14, 2020, 06:26:49 PM »
Well frig.......I tracked down 4 aluminum washers and they were the absolute last the motorcycle shop had in a random mix box of washers, lucky me.....unlucky mean, turns out the threads for the banjo bolt were beginning to strip (inside the carb) and I ended up driving it home all the way. The leak got worse and worse the more times I tried to install the bolt........I think the shop I brought it to caused this issue, just as they had stripped a bolt on my oil pump.....So, it's either time to helacoil the inlet threads, or get a whole new carb............The saga continues and Richard hasn't gotten back to me in regards to other parts yet. Hoping to hear back soon.

 


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