Honda Ruckus and Scooters Ruckus, Silverwing, Reflex, Helix, Metropolitan

Warm up problem?

Old 07-16-2016, 08:25 AM
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Default Warm up problem?

I am helping a friend to resolve a problem with his 2003 Ruckus, and although I am a fair “backyard mechanic” type of guy, my skills really are more geared towards cars and trucks (4Runners!).
At this point I have been unable to resolve (or even determine the source of..) the issue, so I am requesting assistance.
Here's the description of the problem, and what I've done to try to resolve it:
Problem Description:
Bike had been running properly, then, one day, about two or three months ago, it suddenly became difficult to start. The electric start had to be held longer than normally, and used repetitively, and when it did finally “bite”, and stay running, it was weak feeling, and required the throttle to be held and played with a bit, until it was adequately warm. Usually, the first couple of minutes riding would get the engine operating properly. If the engine is stopped and allowed to cool for more than 15-20 minutes, the difficult starting procedure would need to be done again.
In an effort to resolve it, my friend had done some maintenance, installing a new air filter, fuel filter, and cleaning the carb. Some difference was noticeable (improvement), but it was minimal and marginal.
At this point I was invited to assist. Seeing as it seemed to be an issue connected to the warm-up, I focused my efforts at examining the “starting environment enrichment valve” and the “Engine Coolant Temperature Sensor”. I used a caliper to measure the action of the valve as the wax core was heated, and it seemed to behave exactly as it should be, according to a number of videos that I looked at on YouTube
I used an Ohmeter to determine that the resistance values of the ECT Sensor were way out from spec, so assuming I had found the problem, I happily ordered a replacement ECT from Honda. It arrived several days later, and I replaced the old one immediately. I was completely expecting the problem to be totally resolved,and was irked and disappointed to discover that there was no appreciable change in the starting behavior.
I seem to be running up against a wall, as the only other component I could imagine being involved in this problem was the ECM.
Before I ask my friend to buy a new ECM, I wanted to poll this forum, and see if anybody here had already dealt with a similar problem and knew a resolution.
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