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Best Spark Plugs for Carburated 914

I have a 74 914 that has been converted to a single carburator. I have a practically new set of Bosch Platinum Spark plugs in now. These plugs have dark carbon deposits instead of being a light tan/grey color after only a few weeks driving. Any suggestions on the best heat range and brand spark plug for this 914 with a single carb? Thanks in Advance. BILL
Old 10-25-2007, 09:44 AM
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Bosch Copper W7CC's are standard. You can use W8's as well.
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Old 10-25-2007, 10:43 AM
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IMHO, the Bosch Platinums are junk, no matter how many electrodes they weld onto them. Mediocre spark plugs with really lousy quality control. The W7CC are the stock plugs, and they work just fine.

The other big problem is the carb. The single-carb setup is just about the worst possible way to get air and fuel into the motor. It doesn't distribute the fuel very evenly between the cylinders, it is very seriously prone to manifold wetting resulting in an even more uneven mixture, and is almost completely impossible to actually tune correctly.

If you have to go carb'ed, run dual carbs.

--DD
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Old 10-25-2007, 06:06 PM
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Old 11-07-2007, 04:59 PM
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