Read-only archiveOriginal forum posts · 2005–2020

Blown Engine?

104 posts · Started by No. 47 · 06 May 2015

Archived topic · Replies closedJump to last post ↓

Post 1 by No. 47,

#1
Curious one - thought it had just started running on one cylinder with failed plug/coil, nothing unusual for me, stopped to check and rear cylinder/exhaust header cold but lots of oil on lhs (from starter motor area), TB, top of rear cylinder and, particularly, rear crankcase and exhaust header.

Home courtesy of SOS breakdown recovery (I'm one of their known regulars) and strip down starts tomorrow.

Post 2 by bazz21,

#2
hope its something simple i feel for you cheers bazz

Post 3 by ktmguy,

#3
Sad to see another issue! How many miles now mate?

Post 4 by No. 47,

#4
Race miles plus circa 85k road miles but only circa 20k miles on 'new' engine.

Post 5 by bruders8146,

#5
if i can help in any way give me a shout

Post 6 by No. 47,

#6
Ta - hoping that it's just failed rear cam cover oil seal filling spark plug shaft and pumping out via lhs drain hole, wind blown onto top, sides and rear of rear cylinder - can't think of any other theoretical cause given evidence but..............

Post 7 by ktmguy,

#7
Post missing

This post could not be recovered from the original forum.

Post 8 by No. 47,

#8
Ho hum.......damaged rhs inlet valve seat, bent plug electrode so there's unwanted metal in the rear cylinder - nothing obviously fallen in from the inlet tract - so it's engine out again and strip down of rear cylinder.

Post 9 by No. 47,

#9
Post missing

This post could not be recovered from the original forum.

Post 10 by No. 47,

#10
Image

Image

Post 11 by No. 47,

#11
Engine out and off to Paul R tomorrow - far more experienced eye than mine when it comes to engine internals - should use the opportunity to replace front forks and swing arm bearings, I guess.

Post 12 by Colonel_Klinck,

#12
Oh dude that looks all too familiar to me Hope there isn't too much damage to piston, head and bore.

Post 13 by No. 47,

#13
Know of any good SDRs for sale?

Post 14 by Colonel_Klinck,

#14
LOL funny you should mention that.... Fingers crossed it hasn't done too much damage m8.

Post 15 by bruders8146,

#15
keep us posted mate!!

Post 16 by ktmguy,

#16
Not good, was hoping it would be something minor.
Hopefully fixable without too much drama!

Post 17 by No. 47,

#17
Work in progress.........................

Image

Post 18 by Aphex,

#18
Post missing

This post could not be recovered from the original forum.

Post 19 by No. 47,

#19
Post missing

This post could not be recovered from the original forum.

Post 20 by Colonel_Klinck,

#20
Gutted for you. At least the bore survived. Small comfort I know.

Post 21 by No. 47,

#21
As I said in your similar thread, just surprised there was so little mechanical noise, just felt like failed plug/coil pack - bore conclusion preliminary only, based on quick check and need to look below piston, etc.

Post 22 by Colonel_Klinck,

#22
Sounds like yours was much more gentle though. My engine stopped very quickly and without the slipper clutch I'd have been off as I was in a corner doing 70 and accelerating hard when it went. I think all those revs were what did so much damage on mine tbh.

Post 23 by No. 47,

#23
Anyone know if anywhere, in UK preferably, has black Samco hose kit for SDR in stock? Being quoted 4 weeks delivery by usual sources.

Post 24 by shadowman,

#24
I got one delivered in a day or two, not branded samco but side by side they were identicle.

I wil look up the supplier and let you know.

Post 25 by shadowman,

#25
Shove this into eBay. Pictures show orange hoses but I ordered black and got them in days. Identical to the Samco hoses that came off the bike.

161569265874

Post 26 by No. 47,

#26
Ta - but whilst they looked the same, were they Samco/same quality?

Post 27 by shadowman,

#27
Side by side they looked and felt identical. I'm no expert on silicon hoses of course but I doubt there is any real difference.

Post 28 by No. 47,

#28
Bore is also shot, unfortunately, so looking at +£2.2k in new parts, etc............time to strip down the original engine and check condition of rear cylinder, methinks.

Post 29 by Colonel_Klinck,

#29
Post missing

This post could not be recovered from the original forum.

Post 30 by No. 47,

#30
Aye, will strip down and inspect but assuming that it 'survived' the broken plug episode, plan is to put new valves, springs, etc into the 65K miles rear cylinder and stick it on the 20k miles motor - SDR exhaust valves £45 each, inlet valves £145 each apparently....................................

Post 31 by 990RR,

#31
sorry to hear bro

Post 32 by ktmguy,

#32
Post missing

This post could not be recovered from the original forum.

Post 33 by No. 47,

#33
Ta - have contacted Delwest direct.

Post 34 by bazz21,

#34
do all the 990 have titanium valves or only the sdr

Post 35 by Colonel_Klinck,

#35
Post missing

This post could not be recovered from the original forum.

Post 36 by No. 47,

#36
Post missing

This post could not be recovered from the original forum.

Post 37 by bazz21,

#37
Note to self, order ti valves next time I pull apart the engine.

Post 38 by No. 47,

#38
Post missing

This post could not be recovered from the original forum.

Post 39 by bazz21,

#39
Image

Image

Image

Image

Can't find valve head, though, so assuming blown out of exhaust port.

Post 40 by No. 47,

#40
my word that did do a lot damage ,wheres the spring from , id be checking con rod too for straightness , i feel for u man , cheers bazz

Post 41 by Aphex,

#41
Valve spring.

Post 42 by No. 47,

#42
What do you think caused it?

Post 43 by bruders8146,

#43
Valve stem failure probably.

Post 44 by Motogoon,

#44
Holy sugar! That quite something!


So what's the plan?

Post 45 by No. 47,

#45
How many miles had those valves done?

Post 46 by No. 47,

#46
Post missing

This post could not be recovered from the original forum.

Post 47 by ktmguy,

#47
Post missing

This post could not be recovered from the original forum.

Post 48 by No. 47,

#48
Ay caramba, that's pretty bad!
Not usual to let go that way!

Post 49 by Colonel_Klinck,

#49
Bent con rod so complete strip down underway...............................

Post 50 by No. 47,

#50
Man thats ordinary news. Good luck to you.

Post 51 by No. 47,

#51
Ouch, messy.

Valve spring broke letting valve drop and hit piston would be my guess.

New set of springs all round? Are they the originals?

Post 52 by No. 47,

#52
Yep, afaik they're the originals - engine was bought used.

Post 53 by xrpilot,

#53
Post missing

This post could not be recovered from the original forum.

Post 55 by No. 47,

#55
Post missing

This post could not be recovered from the original forum.

Post 56 by bruders8146,

#56
Any pics..I love a good pic

Post 57 by No. 47,

#57
Pics of what?

Post 58 by No. 47,

#58
thought you may of had some rebuild pics

Post 59 by No. 47,

#59
Not of engine work but rebuild manual shows it as it is.

Post 60 by ktmguy,

#60
Post missing

This post could not be recovered from the original forum.

Post 61 by chip,

#61
Another trophy objet d'art for my collection:

Image

Post 62 by No. 47,

#62
Post missing

This post could not be recovered from the original forum.

Post 63 by Harlequin,

#63
Post missing

This post could not be recovered from the original forum.

Post 64 by No. 47,

#64
'Tis back on the road.

Post 65 by Motogoon,

#65
Well done!

Post 66 by ktmguy,

#66
Back on side of road again with dead m'cycle - started cutting in and out, one cylinder occasionally two, no smoke, no oil, no mechanical noise - bad plug or coil, methinks, and carry on - five/six miles later, dies and won't turn over on starter motor - battery fine and breakdown truck's battery pack can't crank engine either - thinking starter motor relay..........hopefully.

Post 67 by No. 47,

#67
You must be a patient man to put up with the crap that bike's given you, I'd be so pissed off by now it'd be down the road if it was me (probably why I'm on to my 37th bike at 41 years old!) Hope it's nothing major for ya again

Post 68 by ktmguy,

#68
Post missing

This post could not be recovered from the original forum.

Post 69 by bruders8146,

#69
Not sure I understand - gut feeling is that it's a failing starter relay allowing enough power for the lights, horn, etc but not for ignition circuit or starter.

First check will be to bypass the relay and hot wire the starter, I guess.

Post 70 by No. 47,

#70
Post missing

This post could not be recovered from the original forum.

Post 71 by Aphex,

#71
Could you to put a muti meter on the starter to see if it's getting the correct voltage?

Hope it is something simple but as soon as it's running I would double check everything, seems very bad timing for something to go wrong after a very recent rebuild.

Post 72 by bruders8146,

#72
Front cylinder plug.............................

Image

......................looks like front cylinder may have dropped an exhaust valve less than 75 miles after the rear cylinder dropped one - engine is locked up this time though.

Engine out and strip down underway.

Post 73 by No. 47,

#73
Sh*t happens, just gotta get on with it - Guinness and Gitanes help.

Post 74 by Colonel_Klinck,

#74
Jesus m8 That really is shit luck

Post 75 by No. 47,

#75
Aye, OE engine rebuild will have to be postponed.

Post 76 by ktmguy,

#76
Shit! I thought you changed all the valves!

Sure it is not a detonation issue that causes this?!

BTW Gitanes... spew... I was under the impression that only the Legionnaires smoked this stuff
Yellow paper ones?

Post 77 by No. 47,

#77
New valves and springs to 65k miles replacement rear cylinder, 20k miles front cylinder decarboned and valves lapped only.

Electrical glitch was due to a faulty ECU - replaced and no similar issues since.

Both yellow (Mais) and white Gitanes for me - not the same as they used to be, sanitised to suit the Americanised French taste trend and no longer available in UK - worth persevering with though, just like KTMs..........

Post 78 by ktmguy,

#78
Post missing

This post could not be recovered from the original forum.

Post 79 by Colonel_Klinck,

#79
I thought you weren't meant to lap titanium valves as it removes the coating from valves and seats??

Post 80 by No. 47,

#80
Aye, just the exhaust valves.

Post 81 by No. 47,

#81
Engine out - snapped exhaust valve stem is all I can see at moment - engine strip tomorrow.

Post 82 by No. 47,

#82
With and without embedded valve head:

Image

Image

Image

Image

Image

Post 83 by Colonel_Klinck,

#83
Holy shit m8. That has to hurt.

Post 84 by No. 47,

#84
Aye, piston twisted and seized in bore and can't remove barrel - will have to cut piston out.

Post 85 by bruders8146,

#85
This is not good.

And I take it SDR engines are as rare as rocking horse poo!

Post 86 by Reb,

#86
Someone has put some bad juju on that bike. Fix that motor and sell that sucker.

Post 87 by bruders8146,

#87
I find it odd that it's happened again so soon.

Could this not be down to bad fuelling and the engine running too lean?

Post 88 by omky756,

#88
Post missing

This post could not be recovered from the original forum.

Post 89 by No. 47,

#89
Post missing

This post could not be recovered from the original forum.

Post 90 by No. 47,

#90
Post missing

This post could not be recovered from the original forum.

Post 91 by ktmguy,

#91
A bot of an horror story there.
Maybe an excuse to do the whole thing up properly with new bits and it'll be fine for another 50 thousand miles!

Post 92 by bruders8146,

#92
Post missing

This post could not be recovered from the original forum.

Post 93 by No. 47,

#93
Not sure of logic of that - rear cylinder drops valve, replace with good used head, barrel and rod but new valves, springs, rings, etc - front cylinder then also drops valve, why not do same?

Post 95 by bruders8146,

#95
Whoop Whoop let the fun commence

Post 97 by No. 47,

#97
This may be the problem...........................



Front lhs inlet valve this time

Post 98 by RichUK,

#98
picture not showing here..

Post 99 by Willh,

#99
Ditto

Post 100 by No. 47,

#100
Edited

Post 101 by RichUK,

#101
Nope, your link requires you to sign into a google account before viewing..., but then denies you access anyway... so is a waste of time.

I've started using flickr to host photos now as it just works without requiring the viewers to jump through hoops.

Post 102 by No. 47,

#102
Ffs.....................edited again.

Post 103 by brudenell8146,

#103
yeah picture link works for me now.

has that dropped a valve and smashed the guide?

upgrade to some bronze type guides may help keep it cool. but then again I'm not sure on policy on titanium valves. sure the titanium itself acts as a heat distributor.

please keep us/Me posted? interested in the cause or possible repair

Post 104 by No. 47,

#104
Not sure yet whether valve dropped or collett broke up first but valve stem is now s-shaped and head destroyed at collett seat.
End of archived topic · Posting is closedBack to top ↑
← Back to Technical - Dr F's Words of Wisdom