Rev counter jumping and engine spluttering/stumbling
Posted: Wed Jul 03, 2019 12:29 pm
HELP : Rev counter and power issues.
Took the Yamaha TRX 850 out for it's first proper ride today after giving it a bit of a service. New rear tyre/bearings/seals, new sprockets, new air filter, fuel tap, carb balance. All fuel/air/vacuum hoses checked and seated. Fuel tank cleaned out too.
Ran amazing the first 40 miles or so, including a stop for breakfast. Real power house. Then after about 20 miles of the return trip it began spluttering/stumbling a bit on acceleration, felt similar to running out of fuel, some times there was a bit of a knocking sound, but it was the same noise you get if you lug the engine, so might just be due to the power cutting in & out. At this point the Rev counter also began jumping up if I opened the throttle more than about 1/4, even though the revs were actually stable (apart from the coughing etc). I could gently cruise home at 4k rpm (allegedly), but any more throttle and it would a) stumble & cough, and b) the rev counter would start jumping wildly. For reference, I'd done only 58 miles on a full tank of fuel.
I'm about to head down and start testing everything with a multi-meter and checking electrical connections. Before I do, does any one have any ideas what it might be?
Took the Yamaha TRX 850 out for it's first proper ride today after giving it a bit of a service. New rear tyre/bearings/seals, new sprockets, new air filter, fuel tap, carb balance. All fuel/air/vacuum hoses checked and seated. Fuel tank cleaned out too.
Ran amazing the first 40 miles or so, including a stop for breakfast. Real power house. Then after about 20 miles of the return trip it began spluttering/stumbling a bit on acceleration, felt similar to running out of fuel, some times there was a bit of a knocking sound, but it was the same noise you get if you lug the engine, so might just be due to the power cutting in & out. At this point the Rev counter also began jumping up if I opened the throttle more than about 1/4, even though the revs were actually stable (apart from the coughing etc). I could gently cruise home at 4k rpm (allegedly), but any more throttle and it would a) stumble & cough, and b) the rev counter would start jumping wildly. For reference, I'd done only 58 miles on a full tank of fuel.
I'm about to head down and start testing everything with a multi-meter and checking electrical connections. Before I do, does any one have any ideas what it might be?