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I can say the 51mm HPI is working well for me and going with 4.9 gps injectors to make sure the fuel pulse is short enough for the valve duration is a good idea. Here's an article on it. https://www.hotbike.com/speeds-spotl...and-injectors/
It is usually done with head porting as well though. Also, it is easier to replace the throttle body when the top end is entirely disassembled like you have it now then only have to do the pushrods and take the heads off later than to do the heads. Doing the heads first means either having to work around the cylinders and heads still in or removing them both again as well as the pushrods to replace the throttle body later.
Last edited by Jay Guild; Mar 9, 2022 at 05:21 PM.
I can say the 51mm HPI is working well for me and going with 4.9 gps injectors to make sure the fuel pulse is short enough for the valve duration is a good idea. Here's an article on it. https://www.hotbike.com/speeds-spotl...and-injectors/
It is usually done with head porting as well though. Also, it is easier to replace the throttle body when the top end is entirely disassembled like you have it now then only have to do the pushrods and take the heads off later than to do the heads. Doing the heads first means either having to work around the cylinders and heads still in or removing them both again as well as the pushrods to replace the throttle body later.
Thanks for the link, I'm going to read through that article. You point here is exactly ehat has me going down this money pit, I keep looking at everything and thinking about what I can do while it's apart to not have to return to this again at a later date and rip the whole thing apart again. It started with just doing cams and is snowballing from there. Money is always the consideration but I have talked my way out of that on some of it, knowing it'll cost more later.
No maybe about it. As good as the late TC heads are, there's lots of room for improvement, and putting a bigger throttle body and intake on stock heads simply makes the heads the bottleneck, especially with bigger cams like the Andrews 57s. Trust me, you're NOT going to get anywhere near the gains with a throttle body that you'll get with a properly matched (for the build) porting job.
This right here. Not to mention having too big of a throttle body will kill low end performance.
This right here. Not to mention having too big of a throttle body will kill low end performance.
Going from a 46mm to a 51mm will not kill low end performance. Shoot the 2008 and up use a 50mm which I would think signals it would be almost necessary when going big bore and the 06-07 use the same heads as the 08 and up.
Going from a 46mm to a 51mm will not kill low end performance. Shoot the 2008 and up use a 50mm which I would think signals it would be almost necessary when going big bore and the 06-07 use the same heads as the 08 and up.
I said using too big of a throttle body will kill low end performance, and it will. It was a broad statement not directed @ your specific setup, relax.
I said using too big of a throttle body will kill low end performance, and it will. It was a broad statement not directed @ your specific setup, relax.
Brownie, man I didn't think it was directed at my setup, agreed that doing the throttle body makes the heads the bottleneck. I mentioned the 51 because that is as big as I've heard anyone should do for a big bore 88TC. Doing the heads makes the throttle body the bottleneck though and the 2006 throttle body is probably undersized for even the stock heads. OP hadn't asked about what one thing to do on top of work already being done to get the most gain, just what else to do. I suggested the throttle body because heads would be next and the throttle body is easier to replace with the cylinders off. Really should just do both, if there's money for it.
Last edited by Jay Guild; Mar 15, 2022 at 11:06 AM.
Ok, so long story short I finished the cam install. I know it took forever but I had a bunch of other projects I had to do first and you know life gets in the way. Anyway, cams are in, bored cylinders and put everything back together. Downloaded the new Fuel Moto power vision tune, and started it up. Started right up and sounded good for about 4 seconds and then stalled out. This repeated every time I started it. There was very little fuel in it and it had been sitting for over a year. I completely drained the tank and added some new fuel and some cleaner in the tank to see if maybe it was from the old fuel or the fact that it was low. No change. If I keep the throttle at about 25% I can keep it running but as soon as I let go it stalls. When it starts up it goes into a high idle like normal but then cuts down after about 3 seconds, A second later it stalls. So my question is could it have something to do with the idle dropping down so quickly after start up and that the motor isn't warmed up yet it is there something else I should look in to? At least she looks pretty.
You sure you don't have any vacuum leaks around the intake and heads? Check for that first..
I replaced all the gaskets when I put everything back together, so who knows. I'm pretty sure everything sealed good when they were installed but I will check that tonight and verify.
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