Engine bogs at 8k rpm... every gear
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Welcome to the group mate,
If it was running absolutely fine for couple months then something is starting to fail or carb is getting blocked,
What i would do is try a brand new plug, BR9ES if that doesn’t sort it could be your coil pack breaking up at high rpm, Also sure jets are not blocked but if it’s cutting power it is either fuel or spark, so start with a new plug first
Let us know how you get on
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Like @HOTSHOT-III said the best Coil pack is the OEM Yamaha one, I couldn’t get my hands on a decent one, but I did trail a few and the best one for me was off yambits, just order a NGK cap for it and screw it on, I’ve not had a single problem with it and starts and revs all the way to 11800 on my rpm and been spot on
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@HOTSHOT-III That is a lot of steps dont you know any ytb tutorial..... your saying i should buy whole new lead and cap for spaark plug?
@Vcelicka This guy has had a go but he's just joining the new lead to a short stub of the old one which might not cure the problem.
https://www.youtube.com/watch?v=jz3pklBtK9o&t=129s
When the coils are manufactured the lead is just a push fit onto a little spike which is the coil output and corrosion can affect the connection here as well as the lead breaking down, hence why soldering makes such a good job of it and sometimes delivers a noticeable performance improvement (the spike sometimes breaks off when removing the old lead but don't worry, just gently clean up what's left of it with a file and solder the new lead to that).
If you don't want to try this just yet you could just trim 5-10mm off the existing lead where it screws into the plug cap as this sometimes helps.
I keep meaning to do a post about this with pictures, will see if I can find time for this
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@SpookDog It runs good to like 7k but even if i WOT it bogs after beeing opens up. I mean i can clean carb but i dont know how to clean HT lead and cap..... but i can for sure change the plug so i will try that
Just wipe them down with a solvent to get any grease and dirt off…
Also look for thin black ‘pencil’ lines on the plug & cap (inside) Carbon tracking can be a nuisance!…You can’t go wrong just replacing the spark plug and cap. If it still has troubles then do the HT lead….
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@Vcelicka This guy has had a go but he's just joining the new lead to a short stub of the old one which might not cure the problem.
https://www.youtube.com/watch?v=jz3pklBtK9o&t=129s
When the coils are manufactured the lead is just a push fit onto a little spike which is the coil output and corrosion can affect the connection here as well as the lead breaking down, hence why soldering makes such a good job of it and sometimes delivers a noticeable performance improvement (the spike sometimes breaks off when removing the old lead but don't worry, just gently clean up what's left of it with a file and solder the new lead to that).
If you don't want to try this just yet you could just trim 5-10mm off the existing lead where it screws into the plug cap as this sometimes helps.
I keep meaning to do a post about this with pictures, will see if I can find time for this
Would a rubber boot, like the one on hard plastic NGK caps slip over the HT lead to coil? Just as an extra layer after sealing. Also do you know if RTV silicone is insulating?…
I’m extra attentive to corrosion since my wires started rotting off the back of the connector blocks!!
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Would a rubber boot, like the one on hard plastic NGK caps slip over the HT lead to coil? Just as an extra layer after sealing. Also do you know if RTV silicone is insulating?…
I’m extra attentive to corrosion since my wires started rotting off the back of the connector blocks!!
…@SpookDog Yes and yes
I've found rubber boots the right size for this in the past, and I think I used to use silicone sealant for this before discovering Shoe Goo. -
@SpookDog Yes and yes
I've found rubber boots the right size for this in the past, and I think I used to use silicone sealant for this before discovering Shoe Goo.Cheers bud!
It’s weird about the wheelie thing. I had my bike do this when I put in a new pilot jet and finally fixed the low rev spluttering and head gasket blowing! It was like an eager little puppy with loads of energy
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Would a rubber boot, like the one on hard plastic NGK caps slip over the HT lead to coil? Just as an extra layer after sealing. Also do you know if RTV silicone is insulating?…
I’m extra attentive to corrosion since my wires started rotting off the back of the connector blocks!!
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@SpookDog does this look good ? https://en.50factory.com/parts news/68749-antiparasites-with-red-wire-ngk-racing-cr2-cable.html Cant found it cheaper
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@HOTSHOT-III @OllieDTR @SpookDog Thanks so much for the help, i just took the cap from the cable an there was little to none cooper left so i cut it little down and cleaned the cap becous it was rusty . I took it around the hood and work absolutely great..... i will buy new plug and cap anyway beacous the rust . Thanks guys
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@HOTSHOT-III @OllieDTR @SpookDog Thanks so much for the help, i just took the cap from the cable an there was little to none cooper left so i cut it little down and cleaned the cap becous it was rusty . I took it around the hood and work absolutely great..... i will buy new plug and cap anyway beacous the rust . Thanks guys
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@HOTSHOT-III @OllieDTR @SpookDog Thanks so much for the help, i just took the cap from the cable an there was little to none cooper left so i cut it little down and cleaned the cap becous it was rusty . I took it around the hood and work absolutely great..... i will buy new plug and cap anyway beacous the rust . Thanks guys
