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Old July 11th, 2019, 01:56 PM   #1
sardilevi
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Unhappy Bike runs weird after crash

Hey, I'm back...

So, about a month ago I had to go down in order to avoid an accident. The bike hit the ground on its left side, but no major damages were caused other than the fairings going to s*it, at least I hope so.

I could not get the bike started after to get it home, came back a day later to haul it home, and of course, it started right up as it got home- whatever.

The issue I am having now is that when the bike is supposed to enter/reach powerband, 8-10k rpm, it just does not want to do it. I cannot go faster than 60-65mph, and if I give it full throttle it even slows down, and the bike does not rev over 8000rpm in higher gears. First and second gears it's able to go above 10k, but not in any higher gear.

So far...I have cleaned the carbs in case of the impact shaking some debris loose. Cleaned the fuel filter in the tank and the tank, there was a decent amount of rust on it and installed an in-line fuel filter as well. I was thinking the fuel was restricted but it all seems to be fine. I have still to check for vacuum leaks, but I ran the bike with the tank in prime, so I do not believe it is a vac issue. Could it be an electrical problem, out of sync carbs, maybe running lean?

I am clueless at this point and would greatly appreciate ideas to what it could be, maybe someone had this happen to them and found a solution.

Thank you
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Old July 12th, 2019, 12:54 AM   #2
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1. Carefully inspect rubber boots between head and carbs. Did any of 4-junctions get pulled apart causing vacuum leak?

If there was rust, it may have found its way downstream.

2. Test petcock flow-rate. Unplug fuel hose from carbs and aim into measuring cup. Turn petcock to prime for 30-sec. How much petrol did you collect in measuring cup?

3. Test float levels without removing carbs! Slip hose over float-bowl drain nipples and aim into empty measuring cup. Drain both float bowls. How much petrol did you collect in measuring cup?

4. Pull plugs and post photos of them. Wondering if speed-loss is due to lean or rich mixtures?
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Old July 12th, 2019, 06:01 AM   #3
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just an aside.....may or may not be associated to OP issue...

on #3 the total sum of fuel from both bowls is not indicative of, nor a true diagnostic to revealing a low or high fuel level in *either*, individual bowl.

suggest testing using gravity fed fuel source, carbs off the bike, clear tubes *visually* revealing individual heights, low or high, for each bowl independent of one another
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Old July 12th, 2019, 07:11 AM   #4
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Sounds like some type of intake restriction or carb slides not lifting correctly to me, but could be fuel-flow related also.

Were the carb diaphragms in good shape? Were the carbs clean inside? Did you remove and clean all the jets, holders, idle mixture passages, etc?

Check that the slides rise and fall smoothly.

Temporarily remove the air filter and see if that changes anything.
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Old July 12th, 2019, 07:20 AM   #5
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I think your bike is fuel injected but if not, perhaps the choke lever got a little bent and is slightly closed.
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Old July 12th, 2019, 09:12 AM   #6
sardilevi
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Quote:
Originally Posted by DannoXYZ View Post
1. Carefully inspect rubber boots between head and carbs. Did any of 4-junctions get pulled apart causing vacuum leak?

If there was rust, it may have found its way downstream.

2. Test petcock flow-rate. Unplug fuel hose from carbs and aim into measuring cup. Turn petcock to prime for 30-sec. How much petrol did you collect in measuring cup?

3. Test float levels without removing carbs! Slip hose over float-bowl drain nipples and aim into empty measuring cup. Drain both float bowls. How much petrol did you collect in measuring cup?

4. Pull plugs and post photos of them. Wondering if speed-loss is due to lean or rich mixtures?
1. The OE rubber boots were in rough shape, a switched them out to simple coolant hoses that withstand the heat and gas - about 2/3 months ago and these caused no issues. I am planning to switch them back to OE parts.

2. I drained about 4 gallons of gas yesterday, not quite sure how long it took, maybe 8-10 minutes. I pulled the fuel petcock apart for cleaning in case something got in it, it is clean and is working correctly.

3. I will have to pull the carbs again to inspect it further, I kind of half-assed the cleaning yesterday, thinking cleaning the jets and passages would be enough, although the slides seemed to move freely.

I will pull the bike apart today again and see if anything changes...
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Old July 12th, 2019, 10:08 AM   #7
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Quote:
Originally Posted by DannoXYZ View Post
4. Pull plugs and post photos of them. Wondering if speed-loss is due to lean or rich mixtures?
Here are the plugs. They don't seem bad to me, as in running rich or lean, but at the same time I'm not an expert.
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File Type: jpg lefty.jpg (62.1 KB, 6 views)
File Type: jpg righty.jpg (53.3 KB, 5 views)
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Old July 12th, 2019, 10:36 AM   #8
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need more of a top view exposing ceramic...less of a side view of threads
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Old July 12th, 2019, 10:42 AM   #9
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The camera focused on my finger but I think it's visible.
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Old July 12th, 2019, 12:15 PM   #10
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on my early 70's Triumph, I'd say they look great....but on your 250.....rich, but at least both are equally so

your air and air filter pathways are confirmed free and clear, beginning to end?

choke linkage is in "OFF" position at carbs? no damage to plunger(s)? linkage or cable not allowing plungers to fully close?
Examining at carb bodies while turning choke off and on up at the lever may reveal any binding.

Do you remember spark plugs appearing the same (rich) in any past removals?
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Old July 12th, 2019, 12:27 PM   #11
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Quote:
Originally Posted by ducatiman View Post
on my early 70's Triumph, I'd say they look great....but on your 250.....rich, but at least both are equally so

your air and air filter pathways are confirmed free and clear, beginning to end?
The airbox and filter are the next on my list, I checked it before however, looked fine.
Carbs are as clean as they can get, set to factory specs, fuel lines seem to be fine, replaced the intake boots back to OE. Vac lines do not seem to be disconnected anywhere.

I am not completely sure at this point, but when I removed the spark plug wires from the plugs, I do not recall too much resistance..impact of hitting the ground might have shaken them loose resulting in poor contact? After all, if air and fuel are fine, it has to be electrical.
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Old July 12th, 2019, 12:39 PM   #12
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on the EX500...inside the spark plug caps is a lug...can be removed with a flathead screwdriver revealing a spring and resister inside.....

school me...is the 250 similar or possibly identical?
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Old July 12th, 2019, 12:53 PM   #13
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this guy might have to do something with my issue...
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Old July 12th, 2019, 01:08 PM   #14
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Whats in there? Your stash?
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Old July 12th, 2019, 01:10 PM   #15
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Whats in there? Your stash?
Gary from Sponge Bob by the looks of it. Revenge for abandoning my fish tank 2 years ago
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Old July 12th, 2019, 01:15 PM   #16
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please don't make me google gary/sponge bob.....what the hell is it? A fish?
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Old July 12th, 2019, 01:24 PM   #17
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It's a snail..There was a snail stuck in my intake
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Old July 12th, 2019, 01:27 PM   #18
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well thats a new one on me....

and a test ride reveals? ability to reach full RPM now maybe?
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Old July 12th, 2019, 01:33 PM   #19
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I was reassembling the airbox for the past 20 minutes..Will post once it rolls under its own power
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Old July 12th, 2019, 01:41 PM   #20
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you are as slow as a sna......eh, never mind

I'll be checking all carbs received for presence of snails from this point forward
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Old July 12th, 2019, 02:26 PM   #21
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Yup...the snail in the intake was the issue..Funny how something this ridiculous can be so frustrating. Everything is back to normal, pulls like a dream. Thanks for the help guys.
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Old July 12th, 2019, 02:39 PM   #22
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snail in airbox presence coincidental to your drop....who'd a thunk it?

weird stuff, fo' sho' ....good you're 2 fitty working ok again!
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Old July 12th, 2019, 03:14 PM   #23
sardilevi
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when you live in florida, stuff like this is completely within reason and at the end of the day you are not really surprised. on the other hand, if someone has blue fairings, i'm interested
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Old July 13th, 2019, 03:05 PM   #24
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this guy might have to do something with my issue...
Yup.

Intake restriction...
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Old July 13th, 2019, 08:30 PM   #25
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Very similar to this case - https://www.ninjette.org/forums/showthread.php?t=331186
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