Last couple rides the bike has been popping severely through the carbs, starts around 3500 rpm and up and is getting worse, it pops five or six times each time I start getting on the gas and with each pop it momentarily kills the power, not like a fuel starvation bog but requires gearing down to get up hills, no popping on decelartion, bike starts and idles perfect, valve clearances are all up to spec, plug looks fine, compression is 159, fuel flow is good, I'm thinking it might be electrical since I dismantled/cleaned the carbs only 2500km ago when I installed a new top end. my question is if it's electrical which is the most likely part to cause this ? don't have a lot of cash so I'd really like to get it right, any suggestions are welcomed and appreciated !
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99 XT600 Severe popping under acceleration
- Thread starter pursang
- Start date
Well the search is back on, I pulled the carbs and gave them a thorough cleaning, inspected every part except the coasting enricher and didn't notice anything obvious in the secondary carb, threw the bike back together and went for a short snort only 5 minutes into it the bike was popping like crazy, it seems to be getting worse with each ride cause on the previous ride it took half an hour to begin popping this bad, I'm wondering if it's an electrical issue ? would appreciate any suggestions.
I noticed the carb was sucking unfiltered air and discovered the original hose clamps even when bottomed out were not clamping tight enough, didn't take much effort to pull the rubber boot off the carb, will use another style of clamp that tightens more.
I noticed the carb was sucking unfiltered air and discovered the original hose clamps even when bottomed out were not clamping tight enough, didn't take much effort to pull the rubber boot off the carb, will use another style of clamp that tightens more.
To eliminate a few more possible problems I drained the fuel tank/carb, pulled both of the fuel petcocks off the tank, removed the screen tubes and blew everything clean with compressed air, the screens were surprisingly clean and the tank only had a few grains of sand inside, refilled with fresh premium and installed another spark plug, hit the magic button and no spark now I'm wondering if this issue is related to the original popping under acceleration problem ? any and all help would be appreciated with what to do next !
Buddie
New member
Normally in gas engine the popping you describe is an ignition timing issue. I don't know how that comes into play in a bikes electrical, it's quite simple.
Your description could easily be the pick-up coil, *if* this was a DRZ400. The P-U coil times the spark and is co-located with (and part of) the stator in the DRZ. I have no idea about the XT600. I think the loss of a spark is a great clue. Have you tried asking on ThumperTalk?
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Thanks Shuswap, I think the XT is the same set up as your DRZ, I agree the sudden loss of spark is probably connected to the original problem, but as some have said I shouldn't jump to any conclusions, I'll keep checking all the components to rule them out and then I guess I'll be left looking at the Ignitor Unit.
Here are the results of some testing with an Ohm meter. I would appreciate any suggestions as to what to check out next
Ignition coil, primary: 4.5 (spec is 4)
Ignition coil, secondary: 14.0 (spec is 13)
Stator coil: 0.6 (spec is 0.65)
Pickup coil: 243 (spec is 230)
Sparkplug cap: 00.0 (spec is 10k)
Sparkplug wire: 00.0 (spec ?)
Here are the results of some testing with an Ohm meter. I would appreciate any suggestions as to what to check out next
Ignition coil, primary: 4.5 (spec is 4)
Ignition coil, secondary: 14.0 (spec is 13)
Stator coil: 0.6 (spec is 0.65)
Pickup coil: 243 (spec is 230)
Sparkplug cap: 00.0 (spec is 10k)
Sparkplug wire: 00.0 (spec ?)
Does anyone know the procedure for checking for juice to the coil and the numbers I should be looking for ? I set my tester to 200 AC and placed one of each lead to each of the wires going to the coil, turned the engine over but the meter remained at zero, I've searched all over for stator output procedures and numbers going to the coil but nothing is coming up, can't find anything in the various XT600 service manuals I have on pdf files either, I'm probably not testing it right.
Problem solved ! a guy by the name of webmonstro over at ADV suggested I check for broken wires at the connector for the TCI where sure enough I found a broken green/white.
This photo was taken before I started testing components, the green/white wire looks perfectly intact.
After pulling the connector from the TCI the wire popped out.
Broke clean off at the spade connector.
Lengthened the wire by an inch and installed another spade connector, the bike fired up immediately and ran perfect with no popping at all, thanks Shuswap and Buddie for your input, the beast is back !
This photo was taken before I started testing components, the green/white wire looks perfectly intact.
After pulling the connector from the TCI the wire popped out.
Broke clean off at the spade connector.
Lengthened the wire by an inch and installed another spade connector, the bike fired up immediately and ran perfect with no popping at all, thanks Shuswap and Buddie for your input, the beast is back !
