- Sat Aug 18, 2012 4:19 pm
#16365
New 535cc engine CR is 6.9:1....previous quoted figure of 7.3:1 was from memory and not correct. So boost of 0.4 from standard 6.5:1
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For Royal Enfield owners and enthusiasts
- Sat Aug 18, 2012 4:33 pm
#16366
----------Yes, nice one LES. Are they made for a 350 as well then ?? If so that would be a proven route for you M1Ks and, as LES says, a slight hike in output. Worth considering.
- Sat Aug 18, 2012 5:36 pm
#16367
I didn't realise it was a 350!...Oh well, hopefully it might have been some use to a another 500cc owner and reader in the same sort of dilemma. No damage done I reckon....BTW....Alan, I detected some sarcasm in your comment. No need for that was there?...just trying to make make a helpful suggestion matey, even though it was inappropriate here...
- Sat Aug 18, 2012 9:55 pm
#16377
Been out naming the Bullet again, (profanity) and getting eaten by the local flying vampiric midgie monsters.
Fitted the front Mitas tyre, (which I have to say looks very nice, will commment on it's ability if it ever gets to turn a wheel in anger again).
Had the quill bolt out and with it the remains of the old seal which has seen better days, have replaced that with one of the cork seals from our hosts.
Drained the sump and obviously the oil that drained from the timing case when the quill bolt was removed.
Took a little video of the conrod / crankshaft play which i'll stick on a fresh post, see what people think.
I was being attacked by the flying beasties far too voraciously so gave in and will, tomorrow, go and give the engine a vigorous spin on the kickstarter and see if the drained sump is refilled by the pump then fed to the rocker pipe feed.
(the pump, incidentally, I took off the cap from the scavenge end to see if it was working, it seems to rotate quite slowly with the spinning of the crank, is this quite normal?)
Alan R Thanks for the links and help, those bore measuring devices look pretty nifty.
Les H thanks for the helpful suggestions, as Alan pointed out it's the 350 not the 500 otherwise that would be a nice option.
So, the piston being a JP one, you say they have a reputation for seizing unless set up with a big clearance? do you mean piston to bore clearance or the piston ring end gap clearance?, it is very useful info though and makes me feel a little better again that it may be another contributing factor, obviously I want to ascertain that the oil flow is there and adequate, (now i'm happy that the pump is moving and the drive isn't stripped apparently), i'm still concerned about this as it would seem the exhaust rocker has suffered a little scoring due to either excessive heat buildup or lack of oil to the rocker.
Pic of the old quill seal, (rubber).
Fitted the front Mitas tyre, (which I have to say looks very nice, will commment on it's ability if it ever gets to turn a wheel in anger again).
Had the quill bolt out and with it the remains of the old seal which has seen better days, have replaced that with one of the cork seals from our hosts.
Drained the sump and obviously the oil that drained from the timing case when the quill bolt was removed.
Took a little video of the conrod / crankshaft play which i'll stick on a fresh post, see what people think.
I was being attacked by the flying beasties far too voraciously so gave in and will, tomorrow, go and give the engine a vigorous spin on the kickstarter and see if the drained sump is refilled by the pump then fed to the rocker pipe feed.
(the pump, incidentally, I took off the cap from the scavenge end to see if it was working, it seems to rotate quite slowly with the spinning of the crank, is this quite normal?)
Alan R Thanks for the links and help, those bore measuring devices look pretty nifty.
Les H thanks for the helpful suggestions, as Alan pointed out it's the 350 not the 500 otherwise that would be a nice option.
So, the piston being a JP one, you say they have a reputation for seizing unless set up with a big clearance? do you mean piston to bore clearance or the piston ring end gap clearance?, it is very useful info though and makes me feel a little better again that it may be another contributing factor, obviously I want to ascertain that the oil flow is there and adequate, (now i'm happy that the pump is moving and the drive isn't stripped apparently), i'm still concerned about this as it would seem the exhaust rocker has suffered a little scoring due to either excessive heat buildup or lack of oil to the rocker.
Pic of the old quill seal, (rubber).
- Sat Aug 18, 2012 10:07 pm
#16378
Hi guys---------OUCH !!! LES, I don't do sarcasm----- as the saying goes "It's the lowest form of wit" and, just like profanities, a total waste of good breath. I've re-read my last posting and just don't see where you're coming from on this one. If you have been offended then I apologise unreservedly----but I assure you, it wasn't intended.
- Sat Aug 18, 2012 10:15 pm
#16382
Have to say Alan your question seemed quite sincere and I wondered myself if this could be done to the 350 effectively giving it a bit more poke in the process.
Had you not said it I would have mentioned it was a 350 and could this still apply?
Any commentary on the oil pump? I take it these things are intended to rotate reasonably slowly? will maybe try to video that tomorrow to make what I mean clearer.
Had you not said it I would have mentioned it was a 350 and could this still apply?
Any commentary on the oil pump? I take it these things are intended to rotate reasonably slowly? will maybe try to video that tomorrow to make what I mean clearer.
- Sat Aug 18, 2012 10:25 pm
#16383
Hi Mk1s The JP pistons seems to expand more than some original type pistons and incidently, are often heavier. Piston ring gaps should be set to the normal recommended gap and this won't have been the trouble as long as they were set to spec originally. Perhaps Paul (Bullet whisperer) can suggest a clearance for the JP 350 piston, But I have read numerous cases of them seizing with standard clearances...perhaps 4 1/2 thou might do? With your cleaned up original, you might well have plenty of clearance now anyway......Hi Alan, okee dokee.
- Sat Aug 18, 2012 10:36 pm
#16386
Forgot to comment on the oil seal ...I've also seen them come loose in the crankshaft end and this will have obviously lost oil pressure and quanity to the big end and the bore/piston lubrication...so maybe that was some of the problem after all that caused the siezing. I reckon the big end bush would have suffered a bit but hard to gauge how much as in the short term they can survive by spinning like a conventional bush if the load on them isn't too high At least the white metal hasn't flaked off it seems.
- Sat Aug 18, 2012 11:00 pm
#16388
From my own experiences, the [Indian] 350's are far more likekly - even prone - to seizing than the 500 cc machines. I conclude my running in when they can pull up a 2 mile drag towards Lampeter on the A482 without nipping up, fingers poised over the clutch in anticipation.
That oil feed seal is not in the best of health, but I don't think the big end ought to have suffered much - the circular shape is unbroken and it would have been trapped in place by the end of the crank and the quill bolt. A 350 can seize without warning at 50 mph where, yesterday, it might have been happy at 65 mph. How they survive in the hot mountainous regions of India beats me. I have only fitted a JP piston to one 500 Bullet engine and that has never run in the 3 years since it was rebuilt - the owner doesn't seem to want it back, so it is quietly gathering dust.
If you can get one, fit a Hepolite piston and it shouldn't be a problem any more. that said, what about the forged ones from Hitchcocks? - Paul.
That oil feed seal is not in the best of health, but I don't think the big end ought to have suffered much - the circular shape is unbroken and it would have been trapped in place by the end of the crank and the quill bolt. A 350 can seize without warning at 50 mph where, yesterday, it might have been happy at 65 mph. How they survive in the hot mountainous regions of India beats me. I have only fitted a JP piston to one 500 Bullet engine and that has never run in the 3 years since it was rebuilt - the owner doesn't seem to want it back, so it is quietly gathering dust.
If you can get one, fit a Hepolite piston and it shouldn't be a problem any more. that said, what about the forged ones from Hitchcocks? - Paul.
- Sun Aug 19, 2012 12:13 am
#16390
Okay, thats a bit clearer then.
I'm going to look at the available options that keep the costs low presently as I have bugger all spare money and bike insurance due plus bills to pay and an alternator belt to buy and fit to the ZXR which only recently was MOT'd after a lay up so I want to use it before the summer ends.
I am surprised I haven't heard of seizure occurences with the 350 before, i've heard mention of the piston crown parting on the 500's though, and like you say it's a wonder they cope with the conditions in India.
My crank video is almost uploaded, will post that soon as it's up and if one of you knowledgeable fellas could give me your opinion on it i'd appreciate that.
The one thing that struck a chord was the comment about considering it run in, when mine seized it was probably about 5 miles in on a continuous throttle run with the speedo flitting between 55-60 when it occurred.
All previous runs were alternating throttle over distance apart from the MOT run which had extended throttle runs but only registering 50-55.
I'm going to look at the available options that keep the costs low presently as I have bugger all spare money and bike insurance due plus bills to pay and an alternator belt to buy and fit to the ZXR which only recently was MOT'd after a lay up so I want to use it before the summer ends.
I am surprised I haven't heard of seizure occurences with the 350 before, i've heard mention of the piston crown parting on the 500's though, and like you say it's a wonder they cope with the conditions in India.
My crank video is almost uploaded, will post that soon as it's up and if one of you knowledgeable fellas could give me your opinion on it i'd appreciate that.
The one thing that struck a chord was the comment about considering it run in, when mine seized it was probably about 5 miles in on a continuous throttle run with the speedo flitting between 55-60 when it occurred.
All previous runs were alternating throttle over distance apart from the MOT run which had extended throttle runs but only registering 50-55.
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