Alright guys, looking for help with my Magnum, seems like anything I do doesnt help, just feels like it hits a wall on the top end, Ive been told its 4 stroking as well.
The bike is bone stock, 12 bing and intake, stock pipe, NGK 6 plug.
So far I have tried changing to a 16 sprocket. I was given a drilled out Bing to 15.8mm and matching intake. I got a free techno boss exhaust and put it on as well and it only made the bike slow down worse to 17mph, was going 23-24 stock.
Put on a 12 intake, 14 intake, with matching carbs. As well as a bing 15 on my drilled out intake nothing helped. I did a compression test and its hitting 90psi, sounds low to me.
What would you guys suggest to try and help my cause? I dont want to kit it to go faster. I do have a cylinder to port but figured I dont "need" that to go faster. Any questions feel free to ask, I'm pretty thorough when trying to diagnose things.