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2004 Honda Metropolitan Scooter - cold engine starting problem

I have a 2004 CH50 Metropolitan (Metro I) Scooter with 1000 miles. Runs perfect in warm weather… This past Fall I had severe problems starting the engine when cold (below 70F). It most certainly is too lean (no choke). I check Starter Enrichment valve and it is correct resistance (5.8 ohms). Spring in valve works well by hand and valve looks pristine. I measure voltage on valve connector and get +12V when key is “on”. I look at schematic, and see the ECM switches the ground (-12V) in order for SE valve to turn on. Problem is ECM doesn’t switch this negative lead to the valve, Starter Enrichment Valve never powers-up, and therefore cold engine is trying to start with lean mixture. I have reset the ECM per Honda manual – didn’t help.
My questions –
1) Am I right to assume the ECM turns on Starter Enrichment for cold starts? Valve on = enrichment?
2) What is the ECM logic for turning on the Starter Enrichment?
3) Does Engine Coolant Temperature sensor tell ECM that engine is cold and therefore to turn on Starter Enrichment?
4) What’s the chance that the ECM is bad? Everything else works.
Any help in this matter will be gratefully appreciated.

Jim Stricker
Strickjc@verizon.net

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I had this problem before,i suggest first replacing starter valve w/ a chinese equivelent part(cheaper than honda but the same),can also replace w/ manual enrichener plunger, but it is inconveinent to access, or what i did was seal off plunger hole and squirted gas through fuel line and a primer bulb, teeing off from main fuel line run spigot fitting into plunger bore and jb weld to seal.now mount primer bulb in convienent location.definitely an unauthorized repair and a little tedious to fabricate ,but works like a charm, as those starter valves are notorious for not working correctly.

Posted on Feb 16, 2009

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