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Post by Razor on May 12, 2017 20:16:40 GMT 1
Just done rebuild of complete bike - (all new seals and bearings etc.) - 1 cylinder doesn't fire enough/correctly. Fitted on rebuild, new Banshee coils, cables & plugs etc. The cylinder fires but 'not enough'. Swapped over plugs, coils and HT cables and the cylinder still the same. Being a complete rebuild with everything new I am left with lack of compression on the one cylinder, which I have to check!! - The exhaust is a lot cooler on this cylinder than the other, except that it means compression check - are there other bits I should be looking at?. It could also be broken rings on fitting (by me!!!)
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Post by rigga on May 12, 2017 22:12:37 GMT 1
Low side coil on stator, measure the resistance and compare to the readings in the manual (listed on here in several places too so a search will reveal the numbers)
Carbs clean and no blocked jets?
Spark plugs swapped over too?
Compression teat to see if equal on both sides?
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Post by Razor on May 16, 2017 19:36:32 GMT 1
As the bike had been stored for 18+ years - it is a nut and bolt rebuild. Stator was taken to 'West Country Windings' for checking and it was found to be good. Coil, leads and plugs have all been renewed - Fitted double Banshee Coils (from Norbo) obviously with new leads and plugs - did swap these over when I started it - and found not running correctly - just the same either way. Carbs were Sonic cleaned and fully rebuilt with new bits again. When I got the bike (in bits) the cylinders had already been rebored and I had the new pistons and rings. The only thing I don't know is whether the Head/Cylinder surface were levelled but, no leakage from there seen from running. I cannot see any leakage from around the cylinders - so its going to be compression test to find reason and hopefully an easy remedy, I don't think I broke any rings when fitting cylinders - but that would be easy answer!!
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Post by Razor on May 21, 2017 19:21:41 GMT 1
Got to go back to low-side on stator!!! - carbs have been cleaned, plug leads swapped over during running and actual plugs changed (Fitted individual Banshee coils which included leads and caps) - did compression test and both show just about 110psi - and both are the same. So I have to go back to checking/question carbs and Stator reading, this didn't give results/readings of manual or RD Site (BUT WHY ONLY ON ONE CYLINDER - EVEN THOUGH I SWAP LEADS? (which includes coil change etc))
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Post by Yogi on May 21, 2017 20:29:28 GMT 1
Swap the carbs over and blank off the balance pipes
At least then you'll know if it's the carbs
Matt
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Post by hotrailsal on Jun 4, 2017 15:17:45 GMT 1
I had this problem on a new build a few years ago,
I spent half a day swapping bits around only to find out that I'd put the carb slides in the wrong way round lol,,
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Post by 4l04ever on Jun 4, 2017 17:12:13 GMT 1
Sounds like carbs.....
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Post by Razor on Jun 22, 2017 21:19:17 GMT 1
Sorry for delay - but took carbs off and checked (SLIDES IN WRONG CARB - THEREFORE BACK TO FRONT) now changed over - float heights checked again - funny enough runs quite well now!!! (School boy error, but at my age nowhere near school boy !!!!)
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Post by stusco on Jun 22, 2017 23:33:00 GMT 1
At least it didn't cost you anything
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Post by hotrailsal on Jun 23, 2017 14:21:55 GMT 1
Ah I was right then lol, exactly what I did,,
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