AR_CL175
Member
Hey Everyone,
So I bought a 72 CL 175 back in May. It was running alright but not great. I (no prior motorcycle/engine knowledge) decided that I would start diving in to make it run better. It was originally bogging down around 4k RPMs. It’s no longer doing that, but now it will die while accelerating. Usually, once I get up around 6k RPMs and shift into 4[SUP]th[/SUP] gear, as soon as I clutch out, the bike dies. It’s done this in lower gears too (1[SUP]st[/SUP] into 2[SUP]nd[/SUP] mostly), but normally it’s between 3[SUP]rd[/SUP] and 4[SUP]th[/SUP] or 4[SUP]th[/SUP] and 5[SUP]th[/SUP]. It’s done this since I purchased the bike, but it used to only be while riding at high speeds (cruising in 5[SUP]th[/SUP] gear) and not that frequent. It happens pretty much every time I ride now. Slowly rolling off the throttle and easing back in after shifting seems to help versus immediate stopping throttle/clutch in, but even doing that, it will still die, just not as frequent. I should mention, the bike fires up and idles fine. The issue comes once I start riding. Below is a list of everything I’ve done so far:
From talking to some motorcycle friends and family, it seems like the engine is getting starved of fuel, leading me to assume it’s a carburetor issue. I’m pretty sure I don’t have stock carbs. I looked at the jets in the carbs and couldn’t find out what sizes they are (if there’s a way to identify them that someone knows about, I’d love to know). The shop manual (thanks to this forum for having a nice library where I could download and print my bike’s manual to hang in my shop) and it looks like I need # 90 main jet and a # 38 slow jet.
TLDR; I’m looking to diagnose what may be causing the engine to suddenly die while riding. I’m thinking it’s a carb issue so I’m putting it in the carb thread. Any help is appreciated!
So I bought a 72 CL 175 back in May. It was running alright but not great. I (no prior motorcycle/engine knowledge) decided that I would start diving in to make it run better. It was originally bogging down around 4k RPMs. It’s no longer doing that, but now it will die while accelerating. Usually, once I get up around 6k RPMs and shift into 4[SUP]th[/SUP] gear, as soon as I clutch out, the bike dies. It’s done this in lower gears too (1[SUP]st[/SUP] into 2[SUP]nd[/SUP] mostly), but normally it’s between 3[SUP]rd[/SUP] and 4[SUP]th[/SUP] or 4[SUP]th[/SUP] and 5[SUP]th[/SUP]. It’s done this since I purchased the bike, but it used to only be while riding at high speeds (cruising in 5[SUP]th[/SUP] gear) and not that frequent. It happens pretty much every time I ride now. Slowly rolling off the throttle and easing back in after shifting seems to help versus immediate stopping throttle/clutch in, but even doing that, it will still die, just not as frequent. I should mention, the bike fires up and idles fine. The issue comes once I start riding. Below is a list of everything I’ve done so far:
- Cleaned carburetors (multiple times)
- Set float height to 21mm
- Replaced spark plugs and confirmed gapping
- Replaced condenser
- Replaced throttle cable
- Added fuel filter
- Cam chain and valve adjustment
- Set the point gap and ignition timing
From talking to some motorcycle friends and family, it seems like the engine is getting starved of fuel, leading me to assume it’s a carburetor issue. I’m pretty sure I don’t have stock carbs. I looked at the jets in the carbs and couldn’t find out what sizes they are (if there’s a way to identify them that someone knows about, I’d love to know). The shop manual (thanks to this forum for having a nice library where I could download and print my bike’s manual to hang in my shop) and it looks like I need # 90 main jet and a # 38 slow jet.
TLDR; I’m looking to diagnose what may be causing the engine to suddenly die while riding. I’m thinking it’s a carb issue so I’m putting it in the carb thread. Any help is appreciated!