ninjette.org - View Single Post

notunderweight · October 13th, 2020, 02:07 PM

just realized both drafts of my first post posted. that's rough...

Anyway - spent some more time on the bike today. Updates & Highlights:

- Pulled the fuel tank for the first time (!) to get a closer look at the carbs
- Redid fuel filter hoses because I didn't like how they turned out last time
- Took some pictures
- Checked the fuel vent line, it's clear and unclogged.

So, as of right now, the bike will run and drive, but just has NO power, especially past half throttle. maxed it out at like 25 in my uni parking lot :P. Engine bogs at 3/4k RPM and will rev, but just, SUPER slowly.

Here's some pictures:

IMG_2774.jpg
Carbs without the fuel tank [image is sideways]

IMG_2787.jpg
Residue at the bottom of my fuel tank; pretty sure it's ash from the wildfires

IMG_2789.jpg
Replaced fuel filter, complete w/ super long lines bc the Advance Auto Parts didn't have a 90 degree version

IMG_2790.jpg
Worrying(?) bit missing from a headgasket.

Anyway, so going down @jkv45's list:
- Pretty confident that fuel tank backpressure / clogged vent isn't the issue
- No idea if it's the carbs, leaving that as the last resort.
- Air filter and intake snorkel are clear. Replacing filter tomorrow just to be sure.

This leaves me with (at least to the best of my knowledge): a clogged petcock screen, or a plugged main jet in the carbs. How should I check the petcock screens? They seem pretty ... inaccessible

Thanks for the advice & motivation. I'll err on the side of doing my own work here, it won't kill me to learn some more about fuel systems.

P.S. That headgasket is sketching me out. Could this be lack of compression from a cylinder leak? Could I check by putting some gasket maker on the outside & seeing if that helps?

October 13th, 2020, 02:07 PM	#7
notunderweight carb hater Name: Jake Location: Boulder Join Date: Oct 2020 Motorcycle(s): 2006 Ninja EX250F Posts: 23	just realized both drafts of my first post posted. that's rough... Anyway - spent some more time on the bike today. Updates & Highlights: - Pulled the fuel tank for the first time (!) to get a closer look at the carbs - Redid fuel filter hoses because I didn't like how they turned out last time - Took some pictures - Checked the fuel vent line, it's clear and unclogged. So, as of right now, the bike will run and drive, but just has NO power, especially past half throttle. maxed it out at like 25 in my uni parking lot :P. Engine bogs at 3/4k RPM and will rev, but just, SUPER slowly. Here's some pictures: IMG_2774.jpg Carbs without the fuel tank [image is sideways] IMG_2787.jpg Residue at the bottom of my fuel tank; pretty sure it's ash from the wildfires IMG_2789.jpg Replaced fuel filter, complete w/ super long lines bc the Advance Auto Parts didn't have a 90 degree version IMG_2790.jpg Worrying(?) bit missing from a headgasket. Anyway, so going down @jkv45's list: - Pretty confident that fuel tank backpressure / clogged vent isn't the issue - No idea if it's the carbs, leaving that as the last resort. - Air filter and intake snorkel are clear. Replacing filter tomorrow just to be sure. This leaves me with (at least to the best of my knowledge): a clogged petcock screen, or a plugged main jet in the carbs. How should I check the petcock screens? They seem pretty ... inaccessible Thanks for the advice & motivation. I'll err on the side of doing my own work here, it won't kill me to learn some more about fuel systems. P.S. That headgasket is sketching me out. Could this be lack of compression from a cylinder leak? Could I check by putting some gasket maker on the outside & seeing if that helps?