Carb sync or something else?

[spyd3rm4n]

I acquired a 2004 FZ1 last year that's been sitting in a garage for 20 years. Carbs and fuel tank were a mess, but I got it all sorted out and it's running great! Starts and idles perfectly, though even with choke on I have to open the throttle slightly to get it to start. (My silver 2002 FZ1 starts with full choke and no throttle.)

I just noticed riding them back to back that this 2004 blue one is severely lacking power under 2500 RPMs. Both bikes are jetted exactly the same using the RavenRider carb mods; though I never drilled the slides on either bike, to maintain the stock-like slower throttle response.

Could this just be as simple as carbs being out of sync? I'm not sure what else to look at. I just had the carbs off to clean blocked pilot jets from 2-3 months of sitting and didn't spot anything out of the ordinary.

 

[Isleoman]

We share the same set up for carbs i.e. RR. Just to add a new method of starting …...mine starts with just the slightest twist of throttle and no choke. It starts with choke and no gas as well. Depends on where it was stored as to which method I use. Needing gas with the choke on in LA (warm) doesn’t seem ideal.

I have two Gen 1s as well, one has a timing advance and the other is stock. My two feel different in the low end mainly for that reason. Advanced ign revs quicker but feels a little anemic at the same time in the bottom end. Carb sync should help depending on how far they are off.

 

[spyd3rm4n]

Needing gas with the choke on in LA (warm) doesn’t seem ideal.

I can still start it just fine with a slight twist of throttle and no choke, but choke on helps it idle smoothly. I can turn it off after 20 seconds and ride away and it's nearly perfect.

I have two Gen 1s as well, one has a timing advance and the other is stock. My two feel different in the low end mainly for that reason. Advanced ign revs quicker but feels a little anemic at the same time in the bottom end. Carb sync should help depending on how far they are off.

I never bothered with the ignition advance on my 2002 but I have considered it for this new bike. Only thing really holding me back is that I prefer more bottom end power as my riding is 90% city commuting.

 

[FZ1Colorado]

We share the same set up for carbs i.e. RR. Just to add a new method of starting …...mine starts with just the slightest twist of throttle and no choke. It starts with choke and no gas as well. Depends on where it was stored as to which method I use. Needing gas with the choke on in LA (warm) doesn’t seem ideal.

I have two Gen 1s as well, one has a timing advance and the other is stock. My two feel different in the low end mainly for that reason. Advanced ign revs quicker but feels a little anemic at the same time in the bottom end. Carb sync should help depending on how far they are off.

Any good way to tell if a new to me bike has a timing advancer on it?

 

[Isleoman]

Any good way to tell if a new to me bike has a timing advancer on it?

duck://player/03rteAdhxew

I forgot about JEDZ from FZ1OA but apparently he made this video.

If you watch the video you’ll see that there isn’t much visual difference. I would assume if you hooked a dwell meter to the bike it would show 4 degrees difference with a stock Gen 1. Not sure what you can see when you take the round cover off the middle of the timing cover. The best you could hope for would be a color other than stock “gold” color.

Dwell meter with motor doing 5000 rpms would be more definitive.