2000 Firestorm wont Rev off idle

[Aussiefirestorm]

Hi Im new to the group so first of all thanks for letting me join
I have a 2000 firestorm (Australian) that I purchased with a failed CCT
Replaced the head , piston and front conrod
My issue is it starts up and idles fine , sounds good
As soon as I go to rev it it will pop back through the carbs and try and stall , if I rev it slow it slowly build up revs but not very happily until around 4000rpm then I can rev it right up it just seems to be between idle 1200rpm and say 3-4000rpm.
I have read through all the old posts regarding the petcock , carby cleaning etc and have had the carbs off and cleaned and blown out with compressed air.
Idle mixture screws are at 3 turns from fully in , I have had the vacuum gauges on and Carbs are drawing same amount , I have no airbox or stacks fitted but have had all this back on and still does the same.
Hope someone can help me out
Cheers
Brett

[lloydie]

Hello and welcome .
Have you put the vac pipe on the correct pipe one the petcock (the horizontal one at the back )
And are your vac pipes in good condition


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[ATM]

3 turns on the idle screws seems high, try 1 and see if this makes any difference. Are you sure the diaphragms are seated correctly and in good condition?

[sirch345]

Also check the inlet rubbers to the carbs are seated properly and are not letting in air, also check for any splits in the inlet rubbers.

Oops I nearly forgot, welcome aboard Brett

Chris.

[VTRDark]

I have no airbox or stacks fitted but have had all this back on and still does the same.

Well there is a clue there as there should be a noticeable difference. I expect you may be running a bit rich, especially if both a/f screws are 3 turns out. Your right on the max there. What size pilot jets are running. Actually what is the complete carb set up. Pilot, needle height, mains and what filter are you running?

How was the the bike timed after the CCT failure I can't help thinking about this and also valve clearances.

(:-})

[Saintsman27]

I agree with all that has been said .... sounds like... timing , was it
timed up correctly after CCT replacement ? ... I have seen quite a
few posts here with the same issues .. good luck with it.

[VTRDark]

I have seen quite a
few posts here with the same issues .. good luck with it.

I'm not thinking 180 out but if things have not quite been aligned properly at either the crank or cam sprockets this will have a big affect on things including valve opening and closing times. It worth l checking as it such an easy thing to do and fix. Check valve clearances while you at it. Once you know things are good there you can then move onto the carbs.

Might as well start with a good Heart before moving on to feeding it.

(:-})

[Aussiefirestorm]

I have the Vac Tube on the correct pipe on the petcock yes I have checked this many times as I see this is a major issue I have not physically pulled it apart and checked it but when I suck the Vac tube it lets a full flow of fuel down both hoses so I am assuming this is correct.
I have checked the inlet rubbers for splits and seating and they visually appear very good.
Timing wise I have pulled it apart and checked it and it is as per the book and have also set the valve clearances (bought a shim kit) to factory specifications.
To me it does not seem like a timing issue but I have minimal experience with this bike and bought it damaged so as I said not sure how it was running before the CCT failure.
I have a standard filter , and unsure of the jetting but I assume stock as it has nothing done to it bar a set of standard pipes that have had the Centre cut out of them but I can check this.

[VTRDark]

Timing wise I have pulled it apart and checked it and it is as per the book

Which book, not a Haynes manual I hope as that is wrong and can lead to further damage.

See the following on timing.
http://www.vtr1000.org/phpBB3/viewtopic ... 31&t=28583

I have a standard filter , and unsure of the jetting but I assume stock

Another link for you. http://www.vtr1000.org/phpBB3/viewtopic ... 14#p238528

Sorry just throwing links at you, I'm pushed for time right now (no pun intended)

(:-})

[Aussiefirestorm]

I'm using the Genuine Honda manual well I think it is anyway it has Honda on the top and 1998 to 2003 also 377 pages in total
I'm sure I have the timing right but now I'm second guessing if you say some manuals are incorrect its no big deal to pull it apart and check it again.
One thing I notice when it is running is that it has a fair amount of pressure coming out of the valve cover hoses is this normal ???
Also if I run it with the plug out of the crankcase that you use to turn the crank there is also a fair amount of pressure coming from there.
Crankcase pressure is not normal well not excessive pressure in car or truck engines so maybe I have an issue there

[VTRDark]

Yes that's normal. Crankcase pressure is high because of those two great big pistons.

(:-})

[Big_Jim59]

. . . I have minimal experience with this bike and bought it damaged so as I said not sure how it was running before the CCT failure.

You and me both brother! I have been fighting this battle too and my advice is to not assume anything and to not leave a stone unturned. You have to start with the basics and see where you are. I know it's frustrating but the bike starts and runs with no knocking sounds. You are 98% there. It will rev once you get off mid range as you said:

. . .then I can rev it right up it just seems to be between idle 1200rpm and say 3-4000rpm

It sounds like something hinkey with the midrange/slow speed jetting. Pull the carbs (it should be easy by now) and look at everything. Note jet sizes, needle shims and everything. Check for obstructions in the pipes and mufflers (this is not very likely but i did have a BSA spit out a bag of weed before.) . Also be sure and check the carb diaphragms. They act really funky when they get torn. Also check for broken choke elbows that could be causing a rich condition on one of the carbs. Sorry, I am just rattling off all the things i checked and or broke on mine.

I had a bike once that I purchased in bits. It ran OK but it drank gas. It got horrible mileage for a 600. I went through the carbs but not good enough and not with a eye for EVERYTHING. Turns out one of the needle jets was missing. I didn't see it because i was assuming that it was there. It wasn't. Make no assumptions. I have and it has come back to bite me.

[VTRDark]

i did have a BSA spit out a bag of weed before

Where can I get one of them bikes

(:-})

[darkember]

Note when you inspect the carbs the emmulsion tubes are not the same for the front and rear pots.

[VTRDark]

Here we go this should help if you going to be stripping carbs.
http://www.vtr1000.org/phpBB3/viewtopic.php?f=9&t=25177

(:-})