Kochan

Did you experience problems like this?

Hi guys, I just want to let you know that I’ve solved the problem and the bike is running well! The problem was the valve timing. When I set it as the service manual says it was not working and I couldn’t align the marks perfectly. What I finally figured out is that the cluch cover on my bike is not original, and the timing mark in the inspection window is in the wrong płace... I had to turn the cam shafts forward to make it work. I don’t have to tell you how much time it took me to figure it out... My main mistake was that did’t properly documented the position of the shaft l, only the camshafts and then I tried to set it as in the service manual... Always look at the bright side so the good thing that I got to know the bike inside out now ;) Thanks for your help guys! Stay safe! Sent from my iPhone using Tapatalk

Can anyone please verify if the timing is correct? 1. 3rd cylinder in TDC on compression stroke https://www.dropbox.com/sh/utvikk4i6qot3l7/AAAhzzkOJuu6x0B98G6pOFF8a?dl=0 Turn the shaft 450 degrees clockwise 2. 4th cylinder in TDC on compression stroke https://www.dropbox.com/sh/k7skyfxa45h9o7l/AAD1TBeVZkNJBStVXtHkTrFxa?dl=0

Thanks for the reply. That’s exactly what I think and trying to diagnose. Currently going to square 1 - redoing cam timing from scratch. Sent from my iPhone using Tapatalk

Hi guys, Current situation - No changes so far... Beside the fact that the problem occurs even on the lover revs - 5k, 5,5k, 6k... (Video) What I've checked so far (replaced from the other - running bike): Vacuum hoses Fuel hoses Fuel pump Fuel pressure regulator Camshaft position sensor PAIR sensor Purge control solenoid valve PAIR solenoid valve Air sensor One way valve MAP sensor Vacuum sensor & chamber voltage regulator rectifier compression test What left to be checked: Ignition Pulse generator Ignition timing Valve timing ECM My questions: 1. Am I right thinking that it's not V-Tec related since V-Tec is activated when the engine reaches 6800 RPM AND the coolant temperature reaches 65°C/149 °F? 2. My current bet is that's valve timing but can the valve timing be "slightly" off? I'm mean - can it look good on timing marks but be not perfect and cause this kind of problems? What do you guys think? Best, Grzegorz

Hi Grum, Thanks for the reply. It's definitely not useless. I've noticed the problem after both Cam Chains and Starter Valves unfortunately. It was a mistake to do both things at once but here we are... The vacuum hoses were checked few times already. It does not seem like they're the problem for now. I was in a hurry before the holidays but now I'll take my time, go back to square 1 and investigate each piece, one by one. What Honda guy suggested was to check VTEC valves, shaft position sensor, the camshaft position sensor, fuel pressure regulator. Will do that. I will keep you guys posted. Best, Kochan

No, no rags :) I just came back from vacation. Honda Service just called me and said they have no time to investigate the issue any further. I need your help guys. Here is how the issue looks like: http:// https://www.dropbox.com/s/3r8kv1guiwzujbs/Video%2023-07-2019%2C%2015%2039%2015.mov?dl=0 I’ll appreciate any help! Sent from my iPhone using Tapatalk

Would the vacuum issue cause problems only on low revs? Wysłane z iPhone za pomocą Tapatalk

No error codes, all leads correctly plugged. I will check if there is an issue with the vacuum. Wysłane z iPhone za pomocą Tapatalk

Thanks for the quick reply! I’ve replaced both. Didn’t mentioned the tensioners because it’s irrelevant. I’ve checked the timing today with Honda manual and it’s correct. I’ll try to diagnose the vacuum leak. Any hints on that? Wysłane z iPhone za pomocą Tapatalk

Hi guys, Something weird happened to my VFR. I’ve replaced the cam chains and adjusted starter valves. After that the bike can’t go above 7k (if adding throttle slowly, if not it happens around 5-6k). It struggles and the revs are jumping (dropping and rising) but not above 7k. It’s a little bit like maxing our the throttle. Any ideas what can be a problem? I will be grateful for any suggestions. Wysłane z iPhone za pomocą Tapatalk