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Post by marrcel on Jul 24, 2020 12:14:14 GMT 1
Well i felt stupid when mine melted. But now i see that it happens to even the respected top engineers. I am looking forward to your diagnosis 👍
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Post by 4l04ever on Jul 24, 2020 13:29:03 GMT 1
Hopefully right hand crank seal was in the right way round, not as per the Haynes manual...
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Post by Dieseldog on Jul 24, 2020 15:51:09 GMT 1
With seeing inside yet I wouldn’t mind guessing it’s the right hand pot That didn’t smoke as much as the left Not sure the piston will tell to much as I wound the pump cable adjuster To pump more before I rode home a good 15 miles I also put my spare plugs in as well Oil pipe to the right carb nipped/kinked? Or injector nozzle in carb partially blocked? Just my 2 penneth worth
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tlmark
Drag-strip hero
Posts: 203
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Post by tlmark on Jul 26, 2020 11:23:21 GMT 1
Morning Gents just finished the strip down, and as expected the right hand cylinder is the offending party. took plenty of pix so get ready
The bore looks undamaged, well no scores so should clean up no problem.
and the plugs now these I didn't ride home with as I put in my spares
no kinked oil lines. one thing I still need to check is the oil passage in the carb
any help is greatfully recived
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Post by st66 on Jul 26, 2020 12:02:35 GMT 1
Mmm nasty,, looks like it's been a bit on the lean side mate,, deff worth checking oil feed in carb if there's no kinks in line,, if the lines new, I'd still replace it or run some brake cleaner through it to double make sure it's clear
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Post by yamman1066 on Jul 26, 2020 20:33:11 GMT 1
air leak , carb rubbers ??
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Post by marrcel on Jul 27, 2020 7:09:33 GMT 1
Something to verify is the piston clearance. Is the barrel bored for a cast or forged piston?
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Post by marrcel on Jul 27, 2020 7:28:45 GMT 1
When you check the oil spigot, take look at the non return valve and spring.
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Post by midlifecrisisrd on Jul 27, 2020 10:42:02 GMT 1
I'll guess lubrication as that's a lot of scoring
Clearance/heat issue I'd have thought 4 point
Lean I'd have thought piston crown/front edge would show more
Either way something went wrong.
As in something changed, it's not done 1000 miles with that problem
Steve
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Post by midlifecrisisrd on Jul 27, 2020 10:44:18 GMT 1
Right plug also looks very wet but that may be the effect of running home injured
A stuck float or loose jet supplying too much fuel can cause bore wash
Steve
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tlmark
Drag-strip hero
Posts: 203
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Post by tlmark on Jul 27, 2020 10:48:28 GMT 1
I'm not sure if it's relevant or not but when I pulled the right-hand oil feed off the carb, the oil sort of oozed out as if it had been under pressure but the left was not like that.
So I was wondering if the pump had a restriction on one outlet (right) would the oil pressure send it to the left? As that seemed to wet for my liking.
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Post by arrow on Jul 27, 2020 10:52:35 GMT 1
Sounds like an issue with the tiny oil exit hole in the carb.
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Post by midlifecrisisrd on Jul 27, 2020 10:53:05 GMT 1
That may indeed have done it
If anything when you pull the oil pipes off there should be nothing out the pipe but after a little while it usually drips out the spigot
Steve
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Post by arrow on Jul 27, 2020 10:55:00 GMT 1
Yep, an open ended pipe has no pressure.
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Damn it!
Jul 27, 2020 11:02:13 GMT 1
via mobile
Post by midlifecrisisrd on Jul 27, 2020 11:02:13 GMT 1
Yep, an open ended pipe has no pressure. It should have no oil at the end of the pipe as the spigot was in the end 10mm or so of it Steve
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tlmark
Drag-strip hero
Posts: 203
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Damn it!
Jul 27, 2020 11:17:12 GMT 1
via mobile
Post by tlmark on Jul 27, 2020 11:17:12 GMT 1
Sounds like we might have a culprit I’ll check the carb tonight
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Post by arrow on Jul 27, 2020 11:23:04 GMT 1
Make sure you set the pump to at least 10 thou minimum stroke.
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tlmark
Drag-strip hero
Posts: 203
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Post by tlmark on Jul 27, 2020 12:02:04 GMT 1
Make sure you set the pump to at least 10 thou minimum stroke.
Will do. Also can I ask how you knew I was doing 50-60 mph when it happened?
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tlmark
Drag-strip hero
Posts: 203
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Post by tlmark on Jul 27, 2020 14:06:45 GMT 1
I'm going to use this to try to pump oil through the spigot on both carbs to see if there is a difference
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Post by arrow on Jul 27, 2020 14:13:08 GMT 1
Midlifecrisis already answered your question.
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neil
Thrash Merchant
my 125
Posts: 385
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Damn it!
Jul 27, 2020 15:51:23 GMT 1
via mobile
Post by neil on Jul 27, 2020 15:51:23 GMT 1
What a b##tard! So when the engine stops the oil would flow back in the pipes towards the pump? I'm thinking if it has become blocked suddenly could sediment in the oil tank get through the pump?
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Post by midlifecrisisrd on Jul 27, 2020 16:02:36 GMT 1
What a b##tard! So when the engine stops the oil would flow back in the pipes towards the pump? I'm thinking if it has become blocked suddenly could sediment in the oil tank get through the pump? If one pipe is blocked it will not feed to that cylinder Arrow will confirm if it will double feed the other cylinder Crud from the tank does pass through the pump If you ever remove the spigots and ball valves they are usually full of crud That why the pumps usually pass oil when not being used and the bike is very Smokey on start up It can quite easily block the carb passage as it is tiny Steve
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Post by flames on Jul 27, 2020 16:15:00 GMT 1
Stripped my frame down last weekend and had same thing on oil feed to nearest carb. Won't say it was very pressured, but definitely ran out to start with. Maybe I was having same issue. Was planning to get carbs cleaned in ultrasonic cleaner so hopefully have caught it in time. Really don't want another rebuild if I can help it. 2 in 600 miles is more than enough.
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Post by arrow on Jul 27, 2020 16:46:30 GMT 1
What a b##tard! So when the engine stops the oil would flow back in the pipes towards the pump? I'm thinking if it has become blocked suddenly could sediment in the oil tank get through the pump? If one pipe is blocked it will not feed to that cylinder Arrow will confirm if it will double feed the other cylinder Crud from the tank does pass through the pump If you ever remove the spigots and ball valves they are usually full of crud That why the pumps usually pass oil when not being used and the bike is very Smokey on start up It can quite easily block the carb passage as it is tiny Steve It won't double feed the other cylinder if one pipe is blocked. What it can do is push the tiny seal off its seat and stop oiling all together. May be this has happened.
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neil
Thrash Merchant
my 125
Posts: 385
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Damn it!
Jul 27, 2020 17:23:56 GMT 1
via mobile
Post by neil on Jul 27, 2020 17:23:56 GMT 1
Thanks for making it clear👍 luckily Mark as you say it hasn't hurt the bore. This has got me thinking about going premix like I have on my 125.
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tlmark
Drag-strip hero
Posts: 203
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Post by tlmark on Jul 27, 2020 18:16:38 GMT 1
Just checked definitely blocked oil way So much so as I tried the syringe with oil and it forced the silicone hose Spigot and sprayed oil up the wall. 😆 I have some fine gauge wire and the second I poked it in the hole Oil bubbled out. I then could push oil through. so I’ll Take them to work and push some solvent though and hope that cleans it
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tlmark
Drag-strip hero
Posts: 203
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Damn it!
Jul 27, 2020 18:19:35 GMT 1
via mobile
Post by tlmark on Jul 27, 2020 18:19:35 GMT 1
Thanks for making it clear👍 luckily Mark as you say it hasn't hurt the bore. This has got me thinking about going premix like I have on my 125. I wouldn’t worry about it they are pretty reliable I’m guessing it’s picked up something from the tank. Even though I cleaned it as best as I could we I rebuilt it.
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Post by arrow on Jul 27, 2020 18:21:26 GMT 1
Get them in a bowl of water with washing up liquid and a length of oil hose sucking and blowing. Took me nearly an hour to sort it properly.
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tlmark
Drag-strip hero
Posts: 203
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Post by tlmark on Jul 27, 2020 18:23:47 GMT 1
Get them in a bowl of water with washing up liquid and a length of oil hose sucking and blowing. Took me nearly an hour to sort it properly. Cheers for you help arrow 👍🏻
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Post by st66 on Jul 27, 2020 18:24:16 GMT 1
Years and years of knowledge on here it's great,, more or less pinpointed the culprit in a few messages, hopefully it sorts it for you mate or at least in the right direction,, its great others with the knowledge share it,, saves money and time I guess,, good job guys 👍👍👍👍👍
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