Ok, my tyga pipes arrived today and i have spent the day playing carb tuning.. fun fun fun. With the stock pipes i was running 132m/j. I fitted the tyga pipes and the bike wouldnt rev passed 10,000rpm. so i went up 2 sizes to 136, alittle better. Im now at 144 but its still not perfect. The bike wont rev out fully but if you ease off the throttle when flat out it picks up the last 1000rpm. This must still be weak so I'm looking at maybe closer to a 150 main jet?
This seems a huge change from 132 to 150 just for changing pipes. Does everyone agree that im heading the right way?
The spec of the bike is its an MC18 R5K, wire splice, moded air box, stock filter, tyga pipes.
I have the use of our dyno on wednesday but i woudl really like to get the bike running something like before i spend the day fine tuning it at work.

Cheers Stephen

Not like your way out of line, see were this guy is set at, new Tyga motor on E-bay had 185 mains.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&category=35595&item=2463505321&sspagename=STRK%3AMEBWA%3AIT[/url]

I spent the day on the dyno today with not very much luck. I ran the bike with jetting i had with the stock pipes (132m/j) and the slowly upping the jetting all the way to 165 m/j with little or no effect (all with the modded air box in place)

With this set up the bike makes poor power (52bhp at peak) but will rev out to about 12,000 sluggisly..

As a last ditch effort before i jumped off a bridge or went to a pub i pulled the air box off and replaced it with 2 foam filters. Guessing at 138m/j i got the best run off 57bhp but the bike wouldnt rev passed 11,000.

After that every time i put the air box within a foot of the bike it would kill the peak power, yet this air box with the stock pipes made 62bhpand was near perfect.

I tryed quite alot of testing with no air box at all and coudl still only get 53-54 bhp at best... for some reason these tyga pipes seem to need the 2 foam filters... someone.... anyone.... please help me here... lol all i want is my 62bhp back

No one can get me a jet kit for the MC18 or tell me if i need to modifiy the air solinoid (pardon spellin im tired and cant think) like you do with the MC21 when fitting a jet kit.

what could i be doing wrong?? Im going to be on the dyno again tomorrow tryin to see if i can improve on my set up with the 2 foam filters as this is the only set up that looks anything liek what it should... but why wont it rev to 12000!! lol ahhhhhh

Thanks everyone

Stephen,
With both of my old MC18`s, I ran 185/182 mains with JHA pipes, and modded airbox.
To get the full advantage of aftermarket pipes, the emultion tubes, MJ needles, and pilot jets should be changed as well as the air soliniods blocked off. The whole purpose of the air soliniods are to create an over-rich condition at 10,500 rpm by bleeding off the air flow to the emultion tubes (the dyno sheet should show when the soliniods activate).
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Mike

so do the powerjets need to be blanked in order to use the HRC type X and Y pieces? Therefore being the reason the mainjets are so large...to make up for the blank PJs? does that sound right?

The story goes on, i have spent another day trying to jet to these tyga pipes with no luck. I have tryed everything i know but still cant get anywhere near the stock pipes.

The funny thing is that no matter what jets you put in the carbs (from 128 to 170 now) it has almost no effect on the power of the bike, which must mean something is restricting it yes??

So i went and got my stock pipes and stock cans.. went right back up to 62bhp. So it has to be the pipes? Ive emailed tyga and they are going to see what they can come up with but its very strange. It cant be the air box or the carbs that are resticing it as both have been removed or playin with till im blue in the face so it has to be the pipes.... they sad to say cos they look fantastic

I guess its like tryin to jet a bike with your finger down the exhaust... no matter what jetting you try you wont ever get passed a certain point while youre finger is in the hole (no i havnt tryed this but i might soon have too lol)

I think as most of you know i was having trouble jetting my bike to suit a set of tyga pipes. Well all is well now. After abit of effort its been found that this certain set of pipes just wasnt going to work. Paul and myself both came to the conclusion that something somewhere was wrong with these pipes.

Today i got in the post a nice new set made to new dimentions which really do seem to work. While i havnt quite finished playin with the final set up the biek really does feel better than the 62bhp i was getting.

Overall the bike feels alot better at the top end.. easly reving to 13,000rpm. It also pulls clean right from 3000rpm with not even a hicup. So at long last im back on the road. Wish i was going to the track day now.

good to hear you got it fixed.......as for the trackday dont worry there is one at cadwell on 26/06/04 and again with loads of 400s from 400greybike on 10/08/04 so we will see ya there instead
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold