- Local time
- 2:18 PM
- Feb 4, 2022
- Nyssa, Oregon
Yeah, I know what your talking. I have 1969 honda ct90 that I'm restoringI've owned a lot of small Japanese trail bikes, many Trail 50's and Trail 90's, even one '71 Trail 90 that had a Powroll 125cc stroker kit, that one was scary and had to be run on 110 octane aviation fuel.
Also a few Yamaha 50's, 80's and 100's, their step-throughs and Trailmasters, a couple TS90 Suzukis and a Hodaka RoadToad. Every one of these bikes ran better with the stock intake and exhaust systems, and it's not like I didn't try. Having the air from the filter enter the carb as undisturbed state as possible, ( no turbulence..) helps. I believe the pod filters create too much turbulence.
If you have seen an older pushrod OHV Honda 50 they have this slightly "S" shaped rubber tube intake from the filter's airbox to the carb, if you take that off and put a pod filter on, you will lose the ability to rev the engine fast enough to break 25 mph. Those early Hondas made 4.4 HP at 8500 rpm and could return nearly 140 mpg if you didn't pin the throttle 90% of the time. More HP per cc than most HD's and British twins.
And they were all cast iron cylinder and heads with pushrods, not overhead cams, and their intakes and exhausts were best left alone.