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Sparkplug issue
Re: Sparkplug issue
But that really looks like oil. So either valve guides, piston rings or a damaged head gasket.
Re: Sparkplug issue
I refurbished them as per spec of Bing, following the data sheet set up of the carburator types (main differences between the two types of carb were the main jets, 105 vs 90). Clip position on the needle is in the first groove for both and is here where i placed
turning adjusting screw in is producing richer mixture, out leaner. I send a couple of picture where is visible that i m running really with the air screw out on the left carb and this seems not having influence on sparkplug which remains fouled. This could confirm that the probelm should be oil and not gasoline.
- cbclemmens
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Re: Sparkplug issue
BTW Higher numbers on plugs usually indicate a higher heat range so your W5 plugs are probably a heat range higher than the W4s. One way to deal with older engines that burn a little oil is to go a heat range higher with the plugs.
Craig
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Re: Sparkplug issue
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Re: Sparkplug issue
R69S - R60/2 - R67/2 - R51/3 - R69
Re: Sparkplug issue
the engine is running good apparently, also to ears more expert than mine. Start at the first kick, idle stable, running smooth from low to higher rpm. No hesitation at full throttle. At cold start i notice little bit smoking from the left muffler, where i have the problem of fouled plug, but immediately disappear when the engine is getting warm.
on the carb:
slide needle is set at the first groove from the top
idle jet and main jet new. Idle jet 40, main jet 105 as per spec
floating needle and float are new
i did not change the idle mix screw needle and slide needle since they looks in good condition.
every passage of carb is free and clean (i used ultrasonic + brushes to make it clean)
air filter:
the original one was missing and it's hard to find a replica. I placed a disc 1 cm foam 60 PPI just to protect the engine from particles/contamination.
Spark Plugs actually used: NGK B8HS
i try to find a device to check compression as you all suggest as next step
question:
1) i don t know how to check and eventually set properly the ignition time on my model. Is there any reference that i can follow?
2) heat range higher with the plug should help me to contain if i well understood. So it means that i should move to "cold type" of plugs. So NGK 9 or 10
3) could be also a problem of engine oil type used? personally i do not know what is inside.
- vechorik1373
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Re: Sparkplug issue
Technical Adviser, Former owner, Bench Mark Works
662 312 2838 cell 9 am to 4pm CST PLEASE!
Re: Sparkplug issue
Another problem is that a good proportion of the 'NGK' plugs in the market place are generic knock-offs from SE Asia, and could be any grade at all, it used to be possible to spot them fairly easily, but no longer.
Re: Sparkplug issue
1964 BMW R69S
1968 Triumph T100R road racer
1972 Triumph T150V road racer
2019 BMW S1000R