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Post subject: siezed on pwks
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Marsbar4LO  Daily Burner Joined: 27 Oct 2004 Total posts: 126 Location: oldham lancashire |
flat in fourth just about to grab fifth and the lc locked up------ clutch in and pulled up. it restarted so i took my chances and made for home got the top end of and both pistons have four near identical marks 2 each side of each piston.  ive just put a set of kr1 pwks on the bike with ramair pods running 135 mains . did a couple of plug chops earlier and slightly rich i was going to jet down . almost sure its not oil related ive used these carbs on lc,s before with injectors . the barrels were rebored 400 miles ago  could this be the problem .
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Posted: Mon Jun 09, 2008 3:22 pm
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| NUTTYNICK |
A 4 corner seizure can sometimes be the result of tight tolerances or not warming the bike properly before caning it?
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Posted: Mon Jun 09, 2008 7:27 pm
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Billy One-handed Stoppie! Joined: 12 Oct 2007 Total posts: 2490 Location: Sweden arise! |
Yep, sounds like tight tolerances, that's very bad. Or do you have forged pistons in cylinders that are bored for those usual pistons like Mitaka? But it's strange that it havn't happened before, or have it?
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Posted: Mon Jun 09, 2008 7:46 pm
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| Rich |
Get some pics up if you can, a seizure from weak mixture will usually start at the piston crown.
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Posted: Mon Jun 09, 2008 7:48 pm
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gary-rd-robbo![[RD/RZ Blood Donor]](../img/pipsvip.jpg "RD/RZ Blood Donor")
RD/RZ Blood Donor Rear-wheel Steering! Joined: 07 Oct 2007 Total posts: 2533 |
sounds like you caned it to early...400 miles??? tbh not long enough common run ins are 500miles but could be tight tolerances/ incorrect oil settings / carbs or combo of the 3 ...seen this on a 250 lc today bloke who came to my shop asked what caused his and the crowns were black/brown but skated marks both sides of the guddy pin and inlet....turned out the pump wasnt set correctly!!!!.
sad news for you as new pistons and least a hone up on the bores...
hope you get it sorted mate...least you kept it going and didnt crash it.
post up your findings
gaz
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Posted: Mon Jun 09, 2008 8:38 pm
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NORBO RD/RZ Jedi Master Joined: 03 Aug 2003 Total posts: 5561 Location: Nottingham |
the water flow at the 4 corners is not so go becourse the bolts go down there . It makes sence if you think about it . So often if you thrash to soon on an lc theys havent expanded the same as the rest and you get marks if you have had a rebore that is still a little tight then this would explane it . I allways put a bit of wet and dry down all 4 corners befor a rebuild a new bored set of barrels to help with this .
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Posted: Tue Jun 10, 2008 7:21 am
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z1100r Ace of Spades Joined: 05 Aug 2003 Total posts: 4836 Location: Coventry |
You will know why when you take the piston out. Some tips below but not cast in stone or anything. Used to have a link to a god site, but seems to have vanished...heres what I remember from it:-
Ally up intake side of barrel/piston - piston picked up by windows ...OIL problem.
Melted at the front or hole formed or forming....usually lean. On one piston only - posible air leak or if on right piston only, crank twist...?
Detonation/pre-ignition - very rare...normally because you cant change it. So only if massive head skimming and tuning gone on...or air leak.
KR1's and 135's are usually OK with an airbox...but without...I used 150's in my 500 with K&N conical filters...my guess would be you need 140's on a 350 with foam...maybe more. Depends how much oil you've got in your foam. Open carbs run much bigger jetting than airboxes.
I CANT BELIEVE WHAT NORBO JUST SAID....   Make your barrel square to avoid a 4-corner seize..hahahaha
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Posted: Tue Jun 10, 2008 8:10 am
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zigcoorsDaily Burner Joined: 04 Aug 2003 Total posts: 162 Location: Derby, UK |
I've got a copy of the 2T piston guide (in a pdf) on my PC at home - Anyone that wants a copy drop me a PM with your email addy and I'll mail it to you.
Ian
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Posted: Tue Jun 10, 2008 8:40 am
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| IanG1 Joined: 03 Aug 2003 Total posts: 1317 |
| zigcoors wrote: |
I've got a copy of the 2T piston guide (in a pdf) on my PC at home - Anyone that wants a copy drop me a PM with your email addy and I'll mail it to you.
Ian |
I have the 2T crank guide if you want a copy mate  
Seriously though, you had a look at tha 250 yet or just chucked it in a corner
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Posted: Tue Jun 10, 2008 9:23 am
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jante350RD/RZ Jedi Master Joined: 05 Aug 2003 Total posts: 5372 Location: Bergen, Norway |
Wot Nutty said, 4 corner seizure means to tight tolerances, or engine thrashed from cold...
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Posted: Tue Jun 10, 2008 2:12 pm
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| NUTTYNICK |
I run 135 mains on my 350 with foam filters and Allspeeds, and it's just a tiny bit rich 
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Posted: Tue Jun 10, 2008 2:48 pm
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zigcoorsDaily Burner Joined: 04 Aug 2003 Total posts: 162 Location: Derby, UK |
| Quote: |
I have the 2T crank guide if you want a copy mate
Seriously though, you had a look at tha 250 yet or just chucked it in a corner |
Nope had running by 8:45 Friday night - from the sound it made when I kicked it over sounded like a piston had broke up or a rod snapped.
Turned out to be a holed piston (unusually RH pot). Probably due to the pattern base gasket leaking - although I'm not 100% sure. Got to do the timing (was set only 500miles ago with a dial guage) and change the gaskets on the other cylinder before I ring it's neck again 
Ian
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Posted: Tue Jun 10, 2008 3:33 pm
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