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Compo |
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Compo Nova Slayer
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Knowlsey |
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Knowlsey Scooby Slapper
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Compo Nova Slayer
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Knowlsey Scooby Slapper
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BFG |
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BFG Brolly Dolly
Joined: 14 Feb 2005 Karma :
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Posted: 09:33 - 10 Jan 2006 Post subject: Re: Honda XL Engine Problems |
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I have an XL600. I'm not sure about the 185, but generally...
Compo wrote: |
Can this old engine seize if it had worn rings/Needed a rebore?
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A possibility, but not where I'd put my money on a 4-stroke. What it will do is chuck buckets of white / black smoke out of the exhaust if the rings aren't right.
Unlike two-strokes, the bores will typically be lubricated from underneath. Check the Haynes manual.
Compo wrote: |
How does the oil get up to the Rockers and cams on this Engine?
Is the oil sucked up from the crank cases by the piston/oil rings?
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On all 4 strokes, no sucking involved. There will be an oilway, or a tube where oil from the pump is sent up to the rockers. I would focus all my attention on the oil pump. They often need priming on old bikes. If you don't mind the mess, start it with the rocker cover off - you should see gobs of oil making its way onto the cyl head area. If not - do not run it any further.
The oil rings on the pistons are designed to prevent oil getting into the combustion area. They don't do anything to the oil.
Compo wrote: |
The bike has two serious problems the most serious is engine seizure I bought the bike with a snapped timming chain thinking about it now most likely due to engine seizure.
Now for the sad part although running a little rough the engine will start and idles nicely but seems to get overly hot and eventually locks up, i believe the piston but can not be 100%.The bike uses a Trochoid oil pump Ive no real idea how these work and im not sure how oil is reaching the rocker arms and cam. |
Snapped timing chain! If this happens, the crank keeps turning, the pistons keep moving - the valves don't - whack (on some bikes). You evidently don't have a holed piston but you might have a damaged valve. Could be bent and sticking or at least not seating properly. Stuck valves sometimes only stick when hot. Also they can mess up the running temp of the engine. Other things to check are cam timing and valve guide clearances, get these wrong and it can run like a dog.
As for oil spatter out the breather - this could be anything. Maybe even crank pressure too high, caused by too much oill in the crank or a blocked oilway, or as you suspect - worn rings, meaning combustion gases are getting past the piston into the crank and pressurising it. Check the colour of the exhaust smoke!
Check your haynes manual for the oil pump. Scan it and post it here if it's a bit vague and we'll try and help. It should run OK on unleaded. Maybe someone who knows this specific bike will post in due course. |
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Kickstart |
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Kickstart The Oracle
Joined: 04 Feb 2002 Karma :
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Posted: 13:30 - 10 Jan 2006 Post subject: |
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Hi
I would suspect the most likely cause is the ignition timing causing it to run hot.
Doesn't really matter if you have a 6V or 12V timing light. The voltage from the coil is far more than that. If you have a crude one that just plugs into the plug lead then I doubt it would care. If you have an inductive timing light then just use the battery from another vehicle to power it (even your car).
Think those old Honda singles need a good clean supply of oil to the head. From memory they had a habit of seizing the cam in the head if the oil supply was not good.
All the best
Keith ____________________ Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing |
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Compo Nova Slayer
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Knowlsey Scooby Slapper
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Kickstart The Oracle
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Compo Nova Slayer
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Old Thread Alert!
There is a gap of 12 years, 244 days between these two posts... |
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davidashley |
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davidashley L Plate Warrior
Joined: 10 Sep 2018 Karma :
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Evil Hans |
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Evil Hans World Chat Champion
Joined: 08 Nov 2015 Karma :
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Suntan Sid |
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Suntan Sid World Chat Champion
Joined: 07 May 2009 Karma :
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Posted: 19:19 - 10 Sep 2018 Post subject: Re: XL185s exactly the same problem!!! |
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davidashley wrote: | Wow! how weird I have exactly the same problem, appreciate this post is 10 years old but I am desperate. The bike had seized when I got it so has had rebore and new piston. It runs really hot, bogs down when revved and will only idle if the choke is on, i have a new carb but have not rebuilt it to try this on, thought I would check what people think before rebuilding it so I dont have to strip it all down again or do any damage trying to run it. |
Running hot, won't hold idle without choke, sounds like you have an air leak. What colour is the plug? I fuel flowing properly to the carb?
I was tinkering with my 1983 XL125 a couple of weeks ago, it has always been a sod to start. First thing I looked at was timing, I haven't got a timing light, so it was just static timing. I changed the timing slightly, matching the "fire" mark as best as I could. All that happened was my bike exhibited all the symptoms you describe above. I put the timing back to the original position and It went back to running reasonably.
My initial problem was difficult starting and running rich.
When I rebuilt the engine, (including a rebore), I fitted a carb kit to the original carb. No matter what adjustments I made to that carb I couldn't stop it running rich. During the rebuild I bought a new carb, (presumably a Chinese copy), which I didn't fit.
After messing around with the timing, a couple of weeks ago, I decided to fit the new carb and bingo, solved the problem straight away.
The only conclusion I can come to is, something in the body of that 35 year old carb is worn out!
If you can afford it get an "ebay special" new carb and see what happens! ____________________ "Everybody needs money, that's why they call it money!" |
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Old Thread Alert!
The last post was made 5 years, 221 days ago. Instead of replying here, would creating a new thread be more useful? |
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