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Post by finchyboy123 on Jun 9, 2018 20:27:53 GMT 1
unlucky hope you get it sorted
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chrisk
Drag-strip hero
Posts: 281
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Post by chrisk on Jun 10, 2018 1:02:29 GMT 1
Looks like too much ign advance to me.
I see it's a non std head... is the volume less than std.
Are you running programmable ign/valve. If so you could try setting pv to open earlier/more around the offending rev range and retard ign.
Better to be safe... then you can adjust carbs to match if needed.
Btw... what did the centre electrode look like on the plugs. Look for frosting at the tips...you only want a smidge..if it's more...ign is too far advanced.
Of course above assumes everything else healthy and correct.
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Post by tsa on Jun 10, 2018 9:36:42 GMT 1
This pic tells the story at 3:30 o'clock position the o-ring has gone and it has water ingress.
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Post by andy71330 on Jun 10, 2018 10:06:57 GMT 1
At least Your ok, could have been alot worse m8 if it threw you off
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Post by 4l04ever on Jun 10, 2018 10:30:33 GMT 1
Check the o-ring depth and width, as have seen one that did not match the o-ring size. There is a standard formula to work out the width and depth compared to the o-ring thickness. I have also seen an o-ring get pinched on assembly. I usually put 5 or 6 small blobs of red grease in the o-ring groove to hold it in place while fitting. Just zoomed in and it looks like the o-ring was squashed on assembly. It also looks like the o-ring groove is not wide enough and maybe too deep? The groove has to be wide enough for the o-ring to squash into. Look here :- www.google.co.uk/search?q=optimum+o-ring+groove
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Post by stusco on Jun 10, 2018 10:51:06 GMT 1
I’ll check some new o rings as the old ones have swollen the domes have 20 on the but that means nowt to me ,i was asked what was running when I ordered so they could supply the correct domes
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Post by stusco on Jun 10, 2018 13:52:02 GMT 1
Just checked the crank big end thrust right side 0.015” left side 0.026” this crank has only done about 1500 miles ,there’s no alloy in the bearings 🤞the web distance is correct 54mm my very near isn’t big enough to check overall length
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Post by jessy03 on Jun 10, 2018 14:01:45 GMT 1
Think 20cc domes will be on your very limit, did you do a compression test, i’m Running 21cc domes at around 140 from memory, 20cc domes will be pushing around 150-160, think you’re into race fuel area? Jess
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Post by jessy03 on Jun 10, 2018 14:02:03 GMT 1
Think 20cc domes will be on your very limit, did you do a compression test, i’m Running 21cc domes at around 140 from memory, 20cc domes will be pushing around 150-160, think you’re into race fuel area? Jess
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Post by stusco on Jun 10, 2018 15:45:26 GMT 1
I did a compression test it was 125psi but I can’t remember if that was before the coolhead ,I’ve had endless trouble with this motor missed the last three summers
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Post by stusco on Jun 13, 2018 19:03:54 GMT 1
Hi.. Which side seized. Btw.. if your bores need alloy removing, I find spirit of salts does the job using cotton buds. Be carefull tho the fumes aren't very nice. If the bore has slight scores due to the seizure, this stuff will get the alloy out of them with a bit of patience. Wash thoroughly afterwards..n oil. Keep away from alloy that you don't want fuzzing away. May be other methods, but this is easy at home, and does not involve touching other parts of the bore...honing etc. Got some drain cleaner (spirits of salt)today ,only took half an hour no more aluminium smeared on the barrel what great tip thanks a lot no scores on the barrel result piston on order👍
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Deleted
Deleted Member
Posts: 0
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Post by Deleted on Jun 14, 2018 11:24:48 GMT 1
What did the plugs look like?
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Post by Shytalk on Jun 14, 2018 11:38:40 GMT 1
What did the plugs look like? If you look at the 16th post they are pictured 👍
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Post by stusco on Jun 14, 2018 14:55:17 GMT 1
This pic tells the story at 3:30 o'clock position the o-ring has gone and it has water ingress. How did you post the pic ?
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Post by tsa on Jun 14, 2018 19:54:02 GMT 1
On your list listing all the pics change the dl=0 to raw=1 and boom the pics appear lol
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Post by stusco on Jun 15, 2018 7:08:15 GMT 1
On your list listing all the pics change the dl=0 to raw=1 and boom the pics appear lol Cheers I’ll try that
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Post by tsa on Jun 15, 2018 9:18:17 GMT 1
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Post by stusco on Jun 15, 2018 16:49:18 GMT 1
Who was the breakdown company? I broke down on my Lc last year on the M65. The breakdown company didn’t even reply. I rang over 20 times so ended up getting a mate to collect me. Mine was through Peter James insurance – so I rang them the next day: Long story short, I was contacted by the director of the insurance company who chased the breakdown people on my behalf. I was compensated. Can’t recommend Peter James highly enough. Sorry I must have missed this it is through peter James when I phoned it was the AA who sub contacted it cvs24 they asked for feed back so they got it I’ve heard nothing since
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Post by billbott on Jun 15, 2018 21:09:25 GMT 1
Who was the breakdown company? I broke down on my Lc last year on the M65. The breakdown company didn’t even reply. I rang over 20 times so ended up getting a mate to collect me. Mine was through Peter James insurance – so I rang them the next day: Long story short, I was contacted by the director of the insurance company who chased the breakdown people on my behalf. I was compensated. Can’t recommend Peter James highly enough. Sorry I must have missed this it is through peter James when I phoned it was the AA who sub contacted it cvs24 they asked for feed back so they got it I’ve heard nothing since Tracey James is your contact 😉
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Post by stusco on Jun 15, 2018 21:10:50 GMT 1
Cheers
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Post by yazza54 on Jun 16, 2018 7:23:14 GMT 1
O ring may well have give up on one side but even the other cylinder looks very lean. I wouldn't worry about the Crank, just make sure you give it a bloody good clean out. Clean up the bores and new pistons. Leak down test and if all seems OK id then get it to muttsnuts or someone equally qualified and make damn sure the fuelling and timing is OK.
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Post by stusco on Jun 16, 2018 7:32:22 GMT 1
O ring may well have give up on one side but even the other cylinder looks very lean. I wouldn't worry about the Crank, just make sure you give it a bloody good clean out. Clean up the bores and new pistons. Leak down test and if all seems OK id then get it to muttsnuts or someone equally qualified and make damn sure the fuelling and timing is OK. I’ve cleaned the bore it’s good to go I’ve checked the crank it’s ok as well so I’m just waiting on parts now ,i will take it down to mutts to get checked It was always my plan but the good weather got the better of me
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Post by stusco on Jun 22, 2018 17:40:07 GMT 1
Just did some measurements fitted barrel and head filled dome with oil to the bottom of plug hole 20cc=15cc 21cc=16cc standard head =25cc to top of plug hole but not fitted so no piston dome Squish on 21cc domes is 0.84 front and back and 0.8 mm at both sides squish on 20cc domes is 0.75 all round
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Post by Tobyjugs on Jun 22, 2018 18:09:47 GMT 1
Hi stusco was the oil measured to the very top of the spark plug hole?
20cc without plug consideration = 13:1 uncalculated compression ratio This is high
20cc with plug consideration = 15:1 uncalculated compression ratio This is too high
I would not go any less than 0.90 mm for squish on a tuned engine unless there was some very special purpose in mind.
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Post by stusco on Jun 22, 2018 18:25:10 GMT 1
Hi stusco was the oil measured to the very top of the spark plug hole? 20cc without plug consideration = 13:1 uncalculated compression ratio This is high 20cc with plug consideration = 15:1 uncalculated compression ratio This is too high I would not go any less than 0.90 mm for squish on a tuned engine unless there was some very special purpose in mind. This was measured to the bottom of the plug hole just the dome filled any recommendations on gaskets they are standard 0.5mm at the moment What’s your thoughts on the 21mm domes
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Post by stusco on Jun 22, 2018 18:26:26 GMT 1
I’ll check the squish with two gaskets tomorrow I’ve had enough today beer time
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Post by 4l04ever on Jun 22, 2018 19:07:45 GMT 1
I have some new 0.6mm gasket material and can make some base gaskets for you. Also have 0.8 which squashes down to around 0.725mm...
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Post by Tobyjugs on Jun 22, 2018 19:34:27 GMT 1
My thoughts are:it would have been better to measure to top of plug hole. I don't think this is the reason for the blow up.
21cc domes = 12:1 which is good.
I would also go for the 0.8mm gasket that rob sells if you used a standard 0.5mm base gasket when you took the measurements.
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Post by stusco on Jun 22, 2018 20:25:15 GMT 1
My thoughts are:it would have been better to measure to top of plug hole. I don't think this is the reason for the blow up. 21cc domes = 12:1 which is good. I would also go for the 0.8mm gasket that rob sells if you used a standard 0.5mm base gasket when you took the measurements. Thanks for the info I’ve messaged rob for some gaskets,
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Post by stusco on Jul 1, 2018 15:43:22 GMT 1
Motor is back in the bike the squish was 1.1mm before the barrels were fully torqued down but they were tight so maybe 1mm now on 0.8 mm base gasket from 4lo4ever (thanks) I’ll check the compression tomorrow barbie time now
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