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Hi I bought a yam yzf 750r as a barn find
Got it home cleaned carbs replaced jets
It fired up runs sweet but won’t Rev past 4000
When the wiring loom was wiggled it revel to 7000 for a second or too (maybe a coincidence)
I replaced the coils but it’s back to 4000 Rev max no matter what wires are wiggled
Any Ideas
Petrol is feed directly from a suspended can
 

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Hi I bought a yam yzf 750r as a barn find
Got it home cleaned carbs replaced jets
It fired up runs sweet but won’t Rev past 4000
When the wiring loom was wiggled it revel to 7000 for a second or too (maybe a coincidence)
I replaced the coils but it’s back to 4000 Rev max no matter what wires are wiggled
Any Ideas
Petrol is feed directly from a suspended can
Is this a stock header with EXUP ? If so is it working? Should cycle open and close every time the key is turned. If it’s stuck closed it’ll prevent proper running. The exhaust valve itself might need cleaned and lube with a high temp lubricant.
 
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