Startup after rain.

[montmil]

2x on the "Gunsmoke" carb article. Great photos and article helped inspire confidence during my carb work.

The enrichener circuit -commonly called a choke- is actually a small carburetor within the larger CV unit. Clean 'em up and note the correct reassembly position of the outer cover plate. Mind the little O-ring.

As the enrichener provides fuel for initial start-up. Suggest you begin there. Report back with your success. [smiley=thumbup.gif]

Monte

[Bob_Roller]

Not to offend your troubleshooting abilities, but is there fuel flow to the carbs ?


Sometimes the simplest things get overlooked !!!

[BooG]

Yeah, fuel into the carbs all good. Cleaned all the jets etc and checked diaphragms. There appears to be compression, although thats only a finger test. Enrichener was overhauled some months back, but I'll check again. There is not even any slight take up on starting: no bite from the cylinders at all. I seem to have all the components  for ignition..spark,fuel and compression. Head scratcher!!

[Bob_Roller]

Have you checked the spark plugs after attempting a start ?

Just wondering if you have fuel or not, on the plugs .

I'm not fond of using starting fluid on the bike, but a quick spray into the intake horns may get it going .

A real long-shot here, but I developed a hard starting issue with my '81 R65, the starter was dry on lubricant, and it was drawing too much power from the battery while in use, leaving not enough power to operate the ignition system at peak output .

I was told about a test for this, charge the battery overnight, remove the ignition leads from the spark plugs, connect a voltmeter to the battery terminals, crank the starter for about 45 seconds to get the 'top charge' off of the battery, then check the battery voltage during starter operation, it shouldn't be below 10.2 volts .

If it does have low voltage, the starter needs a good cleaning and lubrication .

My starter sounded just fine before being serviced, and really couldn't tell much difference in cranking speed after being lubed .

[Barry]

remove the ignition leads from the spark plugs

Be sure to put a spare set of plugs in and earth them on the heads before you crank the engine or you will risk damaging the coil.

[Scooter_Addict]

If it was not for Rick at Motorrad Elektrik, boxers would be found on the side of the roads everywhere!! He has great info whether he is selling his stuff or not. His instructions and pictures are great, the installation was neat and simple for all the products I have purchased. [smiley=bmw_smiley.gif]

[BooG]

So..a weather window has allowed me a few hours today!! Cleaned up carbs as best as I could without doing a full overhaul. No apparent issues other than a missing locknut on the right carbs enrichener lever. As I attempted startup, things fired up as the carb cleaner burnt off, but stopped as soon as it ran out. I sprayed more carb cleaner into the air filter and the same scenario..a near start, kicks in for a few moments but then dies again. A whole lot of whitish smoke out of the exhausts as well as it attempts to fire. So electrical side seems ok...I'm looking at a fuel issue....but I just cleaned out the carbs/enricheners, and there were no apparent blockages. Float bowels have fuel...no contamination, so there is an issue between the float bowl and the atomiser...or possibly diaphragms (which looked ok?) Both sides behaving in a similar fashion though.... stumped!! http://www.bmwr65.org/htdocs/yabbfiles/Smilies/furious3.gif[smiley=furious3.gif] [smiley=furious3.gif] [smiley=furious3.gif] [smiley=furious3.gif] [smiley=furious3.gif]

[Lucky_Lou]

I think you need to get the carbs ulrasonically cleaned before you go any further, you may want to sign up here.
http://gabfesters.co.uk/index.php?act=idx
They have regular workshop days and alot of the members are in London so there may be help close at hand.
Lou

[BooG]

Waddya think of this??
http://www.maplin.co.uk/module.aspx?moduleno=223108&C=Brilliant1&U=Xmas%2009%20-%20Home%20&%20Car&T=ultrasonic%20cleaner&gclid=CLWk3Nils54CFRaX2AoduHuLmQ

[Barry]

The tank is a bit shallow at 140mm (L) x 115mm (W) x 42mm (D) if you are thinking of getting the whole carb in. Otherwise it seems a bargain at that price.

[Bob_Roller]

I got an ultrasonic cleaner about 3 years ago, and personally, it didn't do much in my opinion, to clean the carbs .

I even got a cleaning solution specifically for aerospace  aluminum alloys, and all it did was darken the aluminum .

Ultrasonic cleaners, are surface cleaners, so they won't 'open up' small drilled passageways in the carb, if that is what you were hoping for .

I originally got the cleaner to clean mechanical clock movements, in this application, they do a phenomenal job of cleaning and brightening the brass/bronze metals .

[BooG]

So...plugs are wet looking when pulled, so I assume the fuel is getting into the cylinder. I have not done the ultrasonic job on then yet. Float bowls fill up. Diaphragms ok. Spark is wonderfull!!
Still no joy. Partial firing with aid of carb cleaner. I checked the valves on the left cylinder, and the intake side had no clearance at all. I re-set it to .10mm, but still no luck. Now I'm thinking it could be a valve issue!! It got dark before I could do the other side. Blimey!!!
 [smiley=wall.gif]

[Barry]

Stick with it  - Spark/fuel/compression in the right quantity and at the right time and it just has to go.

[Lucky_Lou]

Have you checked the timing i fitted new points and couldnt get it to run i discovered the plastic cam follower on the points had broken retarding the timing about 10% its not easy to see it with the end bearing cap on??
Lou