My MK3 does not rev beyond 4500rpm

I think this entire thread should be deleted if the original poster doesn't give an update in the next couple of days.

MexicoMike said:

I think this entire thread should be deleted if the original poster doesn't give an update in the next couple of days.

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In fairness, the OP hasn’t been MIA for that long, he last posted on 3rd Sept, it just looks longer coz of the number of posts !

Hopefully he’s busy checking his cam timing and will provide a sitrep shortly …

worntorn said:

All that fussing over the perfect cam profile and all you need is a piece of cold rolled round stock!

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Only need a keyway for the cam gear in the timing chest. Wouldn't matter how many rollers were between the dots on the sprockets either. An expert tuner's paradise.

Alfred Hitchcock would never make a movie without revealing who raided the cookie jar. - Perhaps there were never any in it anyway ? He was just 'stuffing birds and animals' and peeping through a hole in the wall.

There are two very common reasons when a motor will not rev high, and both easy to find. If you disconnect the cable from the instrument on the handle bars - the end of the inner cable is supposed to be square, and fit into a square hole. The other reason is something which often happens to road racers - the need to move off the bitumen onto the grass to avoid dropping oil on to the track.

Lots of people get on the internet asking for help, get a few ideas, then fix what needs fixing and never say a word about making the fix. Hardly worth thinking much about it.

The OP might have the engine apart and be plugging away at it, or got rid of the bike. He did mention he was not happy with it, or was that some other post I was reading.

Fast Eddie said:

In fairness, the OP hasn’t been MIA for that long, he last posted on 3rd Sept, it just looks longer coz of the number of posts !

Hopefully he’s busy checking his cam timing and will provide a sitrep shortly …

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By post #57 it was clear that he had and replaced a bad coil and then the bike would rev without problem to 5000 rpm. In post #57 he stated cam timing correct, 220 main jets, non-crossover pipes, peashooters, and K&N air filter, 22T front sprocket. Therefore, IMHO, he is running out of main jet but as best I can tell never answered the throttle position question so hard to say for sure.

It has now been 10 days. I was on the cam timing bandwagon for a while, but re-reading this thread changed my mind. I'm no longer interested until he has 260 main jets and states the throttle opening and condition (Riding?, What gear?, etc.) where the problem starts if the jets do not fix it.

BTW, if I'm not mistaken, a 22T front sprocket at 5000 rpm is 89 MPH. If he's testing in 4th gear while riding, I hope he's testing on a track or Spain has the equivalent of the Autobahn.

Post 81 I finally received and installed the 260 main jets.

kommando said:

Post 81 I finally received and installed the 260 main jets.

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Oops - don't know how I missed that. He states they changed nothing except making it harder to start which is not something a main jet can do. Still wish I knew the throttle opening and conditions.