Wednesday, January 8, 2025

Yet another update on the CT90

Sometimes the drab, grey days of a Lower Mainland winter are useful...I have the opportunity to update this!

Back in the early Fall of 2024, I had thought of doing another day-trip or two where we could BOTH be riding. So with that in mind, I pulled the old CT90 out of it's corner and went to give it a thorough check-up.
I soon discovered that she didn't start as easily as she used to and when I got her started, she didn't run well at all. After fiddling with it for a while, I decided to re-install the WinCycles carb that I had ordered. This particle carb would leak if I over-tighten the bowl screws, so I had put it away and opted for one of the Chinesium carbs that I purchased from Amazon.
Now, it was the Chinesium carb that was the problem, so I thought I'd give the WinCycle carb another chance.
It was while adjusting the float level, that I noticed the bowl gasket was too large and would encroach into the float's space...this is why the float would stick OPEN when I tightened the screws!
Trimmed away the excess with an Olfa knife and sure enough...that worked...no more leakage.
Unfortunately, the CT still wouldn't run properly, even with the WinCycle carb, so I started looking around for a USED Keihin.
As you can guess, used CT90 carbs are as rare as hen's teeth...but I managed to locate one about 30 miles away...and the guy was willing to give it to me for FREE...can't beat a deal like that!
So once I picked it up, I set about to cleaning it well...lots of compressed air and tiny brushes into every cavity, passage and orifice. Ordered a rebuild kit and re-assembled the carb and installed. Took a few minutes to get things right before she would start, but I finally got her going and adjusted.
The requisite road-test revealed that she couldn't even make 40 mph, so I imagine there will be some more adjustment required...probably dropping the needle clip to get a bit more fuel into her might help. So, this is still a work-in-progress, but it's great to have an OE carb back on this model again.
Wonder when was the last time she had one?


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