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I have a 1998 Valkyrie in very good condition with 26,000 miles. During the last about 10,000 miles, it has developed a flat spot when I would be in any gear (particularly the lower gears) and I snap open the throttle. The flat spot occurs between 2,500 and 4,500 revs; once the engine revs past 4,500, it pulls strong again. During servicing, I had found the foam in the air box intake opening had deteriorated and almost vanished. I replaced it with a new item only to last a few months, deteriorating again. I think the new Honda part had been sitting so long in store that its lifespan was short just the same. So rather than buying a new one, I installed a piece of foam. However, the flat spot still remained. It's good to point out that if the throttle is not snapped open, but fed in normally, the flat spot does not occur.

I believe the flat spot is due to the air box intake (varying size - becoming larger due to the deterioration of the foam) and that this is a common problem to Valkyries although I have never come across it in technical/problem forums.

Has anyone encountered this problem and is there a solution to it.
 

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Valk1500,
Use the link posted in the previous response, then click on the "1500 tech" page.
This is a common known issue with several options. I will give my O2, but please visit the sight for mo better info.
1. Replace your ICM with an Interstate ICM which is 4° advanced and cures your problem.
2. Install a 6° advanced after market trigger wheel. (Will require higher octane fuel)

Easy inexpensive fix
Best of luck
 
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