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How many miles since your rebuild? could it just be burning off excess oil etc from assembly? mine did when i rebuilt it but i put that down to over oiling everything when building , cheers mick.
If I were you Id go for a ride and be sure to get enough miles so you know you have burned off any excess oil....then if you STILL have white smoke you know you may have a problem. Just take it easy.....cheersAndy
I wouldn't let it just idle. Keep the revs up around 2,000 to keep your oil pressure up and put some charge in the battery.
Quote from: mcpuffett on November 25, 2007, 12:16:04 PMHow many miles since your rebuild? could it just be burning off excess oil etc from assembly? mine did when i rebuilt it but i put that down to over oiling everything when building , cheers mick.No miles. This was the 4th time starting it and so far I've just idled it. I liberally squirted oil into the valve covers, maybe that's it. I sure hope so because lugging this motor out of the frame again isn't very attractive.
White smoke on an 836.... WELCOME TO MY WORLD.... <GRIN>I have the white smoke also mine isn't light. It's massive and it's not moisture...I've had the engine out about 4 times now... The first time I pulled the engine. I decided it was exhaust valve guides.( after all this is a 78 F) $327.00 later and with the engine back in. It still smokes...Ok Pulled the engine again.. Close examination of rings and bore. They seem to be fine. On an outside chance decided to give the clylinders a light honing... Reassemble. Still smoking....The fact is the bike runs great. Just has massive white smoke blowing out the exhaust.. Ok. This time I let the bike run abit... Now I pull the header.. There is a good amount of wet oil in the exhaust chambers. No. 2 has huge amounts of oil in it... Hmmmm. I'm thinking ok... This has to be head gasket and or o ring seals between the head and cylinder. Yet there is no external oil leak... I order a 836 head gasket from Dynoman.It arrives and once again I pull the engine. Install the gasket and reassemble in bike.The #$%* still smokes.....I've about had it with this engine. I'm ready to melt it down and make some aluminum foil..
The Wiseco 836 pistons have a lot of flat areas on the under side of the piston. This causes exsesive pressure build up in the motor, several people have had this problem.We fitted extra breathers on # 2 and # 3 tappet covers and took them to a small catch that sits where the starter motor was.Never had a problem since.Sam.
Yes, with the motor in. Just remove the two inner inlet tappet covers, drill and thread to take a threaded tube with lock nuts.Replace them, and push two lengths of plastic tube over them.Sam.
Arts motor had the pistons modded by Mike.Sam.
Quote from: SamCR750 on November 26, 2007, 05:01:21 PMArts motor had the pistons modded by Mike.Sam. Yes yes yes. Mike knew of the possible issues that could arise with those pistons. He modified the pistons and then sent them to Swain Tech for special coatings. Building a high performance engine that works well isn't as simple as putting in new parts; some of those new parts really need some extra massaging. Mike knows little tricks and special adaptations that need to be carefully performed so that the engine will be trouble free. These are the things that no one ever talks about but make a world of difference. If you look at the pistons on my build page you will see how they were shaved to achieve a perfect fit.Sparty (Art)
I had the oil sealing washers leaking problem. I solved it by using Honda OEM instead of aftermarket ones - and I added Hondabond to the edges of the rubber during install. I also learned the hard way that the small 6mm studs that hold your cam tower block on must have Blue Loctite applied if removed, else they will let oil leak by and "drip" onto the sparkplugs. I also did the Carillo, heavy APE studs upper and lower the 2nd time around because I was determined not to have to go in there again until ready.I have not had a crankcase breathing problem. I talked with Buzz and with two pistons going up and two down all of the time - the differences in piston diameters and air moving were balanced. I did install a new large-diameter tube for the seperator/breather sitting on top of the head. My engine has 500 miles on it since going back together in early May. We rode it at Deal's Gap in May and logged 140 miles in the NC mountains in one morning. I never saw smoke coming from the Kerker when I rode behind it - yes, my bike was taken from me that whole weekend - people loving the old girl.My tappets aren't drilled and no catch-cans.Regards,Gordon
If it keeps smoking out the exhaust, take the header off and start it briefly to see if the smoke is coming from all cylinders or just one.If one or two are doing all the smoking, chances are that the oil expander ring, the center one in the oil ring has the ends overlapped instead of butting up. When this happens, there is no tension on the oil ring and it will smoke bad from that hole.Jay
Good point by Jay. Don't think I've seen that addressed before.Wouldn't it be nice if you put a few miles on it, the rings seated, and it quit smoking?! Hope you're not just jumping the gun. Don't baby it too much during breakin or you might glaze the cylinder walls and the rings will never seat. That requires another tear down and cylinder hone. If this happens at least you will be able to check that your rings are installed correctly.
And what about the white smoke? Did it disappear during the ride?cheersAndy
Yippee, CR carb tuning. Glad I'm not the only poor sod having to tackle it this year Do yourself a favor and put on whatever muffler you intend to run before doing the fine tuning. The transitions between 1/4-1/2-3/4-Full throttle took me some time to sort out and a change in exhaust backpressure meant a little fiddling with needles and idle mixture. I did have steady white smoke when decellerating from full throttle when I first got my 836 running, due to rich gas mixture(has since disappeared). Also, a bit of oil consumption for first 500 miles or so until rings were well seated. Heavy white smoke that lingers in the air would not be good, but I've had that little white haze that disapates about 5 feet behind the bike when sorting out tuning on a fresh engine.
Further to what Sean has just said Sweepy, the CR carbs are racing units and should be treated as such.You need to get your exhaust in the state you are going to run it before any atempt to sort your carb settings.Also, settings that work for one person and their bike might not work on yours.These instruments are very sensitive and susceptible to fluctuations from weather and alltitude change.If it makes you feel any better, our CR leaves a trail of white smoke as it leaves the line.....................from the rear tyre Sam.
Further to what Sean has just said Sweepy, the CR carbs are racing units and should be treated as such.You need to get your exhaust in the state you are going to run it before any atempt to sort your carb settings.Also, settings that work for one person and their bike might not work on yours.These instruments are very sensitive and susceptible to fluctuations from weather and alltitude change.If it makes you feel any better, our CR leaves a trail of white smoke as it leaves the line.....................rom the rear tyre Sam.
