running issue. its got me beaten

[slabghost]

With all that's been done on this motor I don't think I could find the problem if I was looking right at it. Best of luck.

 

[aussiegold]

cases split, all pistons removed. rings all present and accounted for, all weighed ( although my mechanic mate says its not critical, or not as critical as a v twin ) and within 5 grams of each other. conrod bearings plastigauged for the second time and all good. i did not disturb the crank. nothing loose inside, so all bolted back together.
cases rejoined , so, tomorrow, a bit of a clean up , put the rear case back on and put it back in the bike and then its a case of waiting for the top end gasket set to arrive.
:Egyptian: :Egyptian: what else would i be doing ??

 

[slabghost]

Have you measured the valve springs tension? Inner and outer valve springs should each push roughly the same pressure compressed 1/4" further than installed height. I had planned to have a tool made to use a beam style torque wrench to measure mine but the machinist got busy and never made the tool for me.

 

[aussiegold]

slabghost » Tue Nov 18, 2014 11:31 pm[/url]":v8m41zge]
Have you measured the valve springs tension? Inner and outer valve springs should each push roughly the same pressure compressed 1/4" further than installed height. I had planned to have a tool made to use a beam style torque wrench to measure mine but the machinist got busy and never made the tool for me.

i havent measured the tension on those springs. i did measure the heights and all were the same. it goes back together when the gasket set arrives and if it dont run i will sell it. or give it away. a bloke i know has got a couple of postie bikes. ( so called because they are used by Australia Post ) might do a deal with him and enter a few Postie Bike challenges, where you ride these things across ( or up and down the whole country. ) pic of postie bike...

 

[joedrum]

when i was a kid there was a lot of the honda 65 i think they were called ..just like the pic ..rather bad exhaust scheme ..but look better than the honda 50s

 

[aussiegold]

i think these are a ct110 or some thing like that..... 110 cc single cylynder....single carb.... go forever... i'm getting a vision .... 2 of these in my near future.... :yahoo:

 

[aussiegold]

got the engine all back together. used some copper spray this time on the head gaskets. first time i've used it , suppose it'll be ok. took the carbs back off the LTD ( I put the 75 rack on the LTD so i could refurbish its carbs ) swapped some tyres around , ( all these trips to Melbourne , Bendigo etc are taking their toll. )
also, i have switched the gauges on the 75 , on the last trip the speedo needle started wavering badly, then the whole unit started screeching like a banshee. she's knackered.
managed to strip a bolt on the lower radiator hose fitting , where it bolts to the water pump cover. went down to the bolt place and bought a repair kit, ( the kind with stainless steel thread inserts ) and did both bolt holes while i was at it. terrific repair kit called Power Coil .
ps
no change in the engine. still running rough . i am almost done.

 

[Steve83]

:head bang: :headscratch: ?!?!?!

 

[joedrum]

sheesh this sucks ....

 

[slabghost]

Put that motor in something and run it like ya stole it. Beat it. Maybe you can beat it into submission. That's about the only idea I have left for it.

 

[aussiegold]

joedrum » Tue Dec 02, 2014 9:38 pm[/url]":2jnzutdp]
sheesh this sucks ....

well, yes ... and no Joe. lots of positives have come out of this so far. i can remove and replace GL carbs in no time flat. also engine removal is a breeze now. i've seen the insides after approx 1000 klms , looks just as i put it together. :smilie_happy: i have been able to compare the Dyna with the C5. (no contest.) i've made a friend down at the bearing joint ( who also sells o rings ) :salute:
i'm betting that the answer is staring me in the face. :doh:

Put that motor in something and run it like ya stole it. Beat it. Maybe you can beat it into submission. :Egyptian: gave that a bit of a crack, on the way back from Echuca a few weeks ago. :moped:
typing this out just now and i'e had another thought ... like, when an alcoholic has a moment of clarity... :whistling: i wonder if having the engine bored and honed .25 first oversize , is enough to play demons with the carb jetting ? :yahoo: here i go again...................

 

[dan filipi]

Could very well be.

 

[joedrum]

hmmmm you might be right aussie i cant remember much but when i had early cams in the 1100 ..i did have to screw with early rack quite a bit ...seems after carbs were sync ..i turned each snyc screw 1/4 turn and the motor got right ...i think your on to something

 

[mcgovern61]

i wonder if having the engine bored and honed .25 first oversize , is enough to play demons with the carb jetting ?

Hmmm....I was under the opinion that these cylinders could not be bored and honed again? (Friend of mine told me that years ago, but I am not sure about that.)

Do you need to sleeve the cylinders after boring or just oversize the rings (or is it the pistons?)

 

[aussiegold]

there's lots of oversize pistons etc. Honda make them. list of the sizes on CSMNL . .25, .50 .75 and 1.0
mine are .25 over( i think it means 25 thou oversize ) they were hard to find ( oem ) and bloody expensive. there is no problem boring these out. i think it's the crankshaft that can't be ground. but if you have enough money you can do anything. ( thats not me :beg: )
an interesting thing i learned from the machine shop was that HONING is part of the Boring process. ( or should be ). the cylinder is bored to a size just under what is needed, and the final few thou is taken off in the honing process.
i might get a washer under the slides/needles and see what happens. cant hurt . k:

 

[joedrum]

yes turning sync scewa dose the same thing really brings more gas at just off idle

 

[Steve83]

The piston/cylinder oversizes are .25mm, .5mm, .75mm, and 1mm.

Not to put a damper on your latest idea, but my '83 1100 is running great with completely stock and unaltered 1000 carbs. I can't imagine that a 0.25mm larger bore will pull in that much more mixture. There is a 3mm difference between the 1000 and 1100 bores (same stroke).

But...who knows...just my random thoughts...

 

[aussiegold]

you are absolutely correct. washers ( about 20 thou thick ) lifting the needles made not one jot of difference. except to slightly raise the idle. back to the drawing board............. :read:

 

[Steve83]

Just another thought...are all 4 pistons installed with "IN" facing up? The valve clearance cutouts are different for the intakes and exhausts, and the pistons might possibly have a small wrist pin offset - I'm not sure on these. Trying to consider all possibilities...

 

[aussiegold]

thanks for the suggestion, but all that triple checked. i'm just going to ride it. i'm done. it goes. and it looks/sounds ok.
time to just clean it , tidy the tools up and give it best. :moped: