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Message started by danroot on 07/01/10 at 14:05:52

Title: am i missing something? (performance question)
Post by danroot on 07/01/10 at 14:05:52

ok, so my bike is almost finished, ive been riding it for about a month after having it dismantled for almost a year. i did a few performance upgrades to it while it was in pieces. my problem is, while doing the upgrades i was expecting to get an increase in my top speed, which was about 60mph before the tear down. now after installing all my new parts im averaging about 55-60mph. it feels a little punchier, louder, and it responds better, but i can barely get it up to highway speeds.

what am i missing?

here are the specs:

1987 with 20k miles
mikuni 38mm vm carb, kn cone filter
supertrapp exhaust
verslavvy tensioner
stage one performance cam
recent valve job
chain conversion. 43/17

i have a ufo and a dial a jet, but i have not added them yet. waiting till after summer to open it up again ;)

Title: Re: am i missing something? (performance question)
Post by justin_o_guy2 on 07/01/10 at 15:18:56

How many disks on the TRapp?

Title: Re: am i missing something? (performance question)
Post by Trippah on 07/01/10 at 15:47:08

Well, the sav ought to get 80-85 mph on the flats so if your gearing for the chain conversion isn't off, I'd say you've got duncan donut size wheels; or the best nonheating brakes that never go off the job.

Title: Re: am i missing something? (performance question)
Post by Charon on 07/01/10 at 15:55:51

You really needed to find out why it wouldn't exceed 60 mph before you ever started playing with it. It should have been able to hit 80 or better. If it wouldn't, you are throwing performance modifications at a serious underlying problem. In short, wasting your time.

Title: Re: am i missing something? (performance question)
Post by Routy on 07/01/10 at 16:17:34

What does it do when it peaks out ? If its not crapping out, but just laboring hard, I'd be looking at timing,....either ignition or valve.

Or test the compression. If valves are leaking, or if ring are worn, it will be low on "expression" ;) and therefore short on horse power, therefore low top end.

Title: Re: am i missing something? (performance question)
Post by Serowbot on 07/01/10 at 16:27:29

a stocker will do 88mph,.. according to mag tests...

You seem to have suped it down... :-?...

If you have good compression,... look into jetting, maybe giving it too much of a good thing...

Title: Re: am i missing something? (performance question)
Post by Ed L. on 07/01/10 at 17:04:40

Wrong CDI box or ignition sensor? the 4 speeds and 5 speed boxes are not interchangable. Maybe the cam is off by one tooth? A bad coil? just throwing out some ideas. With the mods you have you should see the ton with ease.

Title: Re: am i missing something? (performance question)
Post by danroot on 07/01/10 at 21:44:47

there are 12 discs on the trapp. the cdi box is original to the bike, if there was something wrong with it, would that cause it? when you hit 55mph it seems to just hit a wall, if you give it more gas it will go a little faster but it gets way louder.

as far as the previous problem, i was told the valves were bad, so they were replaced at the same time as the upgrades.

Title: Re: am i missing something? (performance question)
Post by verslagen1 on 07/01/10 at 23:11:06

05000F130E0E15610 wrote:

when you hit 55mph it seems to just hit a wall

I think we've heard this before.
Check the cam timing, easy to get wrong.
With a stretched chain, the timing needs to lag a little bit.
In other words, with the TDC marks on the crank aligned, on the tension side of the chain, the cam timing is above horizontal.

Title: Re: am i missing something? (performance question)
Post by Long-Savage-Rich on 07/01/10 at 23:54:41

33363925383823570 wrote:

What do you mean by louder? You say if you give it more gas it will go a little faster but it gets way louder. Are you saying that it seems to be reving more rpms but just no more speed?

Title: Re: am i missing something? (performance question)
Post by BurnPgh on 07/01/10 at 23:55:23

i vote jetting. In what gear are you hitting the wall at 55?

Title: Re: am i missing something? (performance question)
Post by danroot on 07/02/10 at 00:49:40

4th gear hits the wall. its hard to explain, but i dont think it revs more rpms, it just feels like it could go faster but when you give it gas the engine noise gets louder, the throttle feels like its plenty open.

Title: Re: am i missing something? (performance question)
Post by BurnPgh on 07/02/10 at 00:55:03

clutch slip? I did similar mods to yours with the addition of an overbore and wiseco psiton and i'll be darned if my clutch didnt slip something fierce. The better i had it jetted the more it'd slip. Still isnt jetted just right but I bought a barnett kit off ebay and it definately stopped slipping. Im shifting into second at 30-35 now as opposed to 20-25 before and with corect jetting i imagine a 1st gear redline of 45-50, maybe higher.

Title: Re: am i missing something? (performance question)
Post by BurnPgh on 07/02/10 at 01:03:24

On second thought...Im still betting on jetting. Gotta check that plug...over and over and over and over again 'til you get it.

Title: Re: am i missing something? (performance question)
Post by danroot on 07/02/10 at 01:22:18

what jetting did you find worked?

Title: Re: am i missing something? (performance question)
Post by justin_o_guy2 on 07/02/10 at 02:56:59

14 disks & a stage 1 cam, I have a couple sizes up from stock on the main & stock ( heck, its almost 5 am, been up since 3, kinda cant remember all the right words,, sorry) on the smaller one./

Title: Re: am i missing something? (performance question)
Post by BurnPgh on 07/02/10 at 11:21:59

My bike is a freak. My results so far do not jive with anyone elses experience. The plugged pilot was too lean so i put in a 10 which became too rich as i upped the main/mid circuits. Had to drill an airbleed in the needle jet. 480 main and im still a bit lean on the mid and main as confirmed by my plug.

Title: Re: am i missing something? (performance question)
Post by babyhog on 07/02/10 at 12:29:50

7E494E526C5B543C0 wrote:

My bike is a freak.

Nah, its just because you are in Pburgh... ;)

Title: Re: am i missing something? (performance question)
Post by spacepirates on 07/02/10 at 13:02:19

0C0F0E03011B620 wrote:

[quote author=7E494E526C5B543C0 link=1278018353/15#16 date=1278094919]My bike is a freak.

Nah, its just because you are in Pburgh... ;)[/quote]

back off, babyhog, Pittsburgh is the best! lots of curves to ride up and down and around... looks nice at night too.

with a stock engine, rejetted stock carb (that isn't right just yet) , a cone air filter, and a jardine exhaust that blew the baffles out of itself I can get to 80-85 with little difficulty.

i'd vote to double check the carb jetting and then if that is good go into the engine. you've got to be losing power/efficiency somewhere, and aren't too many parts to lose it in...

Title: Re: am i missing something? (performance question)
Post by babyhog on 07/02/10 at 13:16:07

7F7C6D6F697C657E6D78697F0C0 wrote:

[quote author=0C0F0E03011B620 link=1278018353/15#17 date=1278098990][quote author=7E494E526C5B543C0 link=1278018353/15#16 date=1278094919]My bike is a freak.

Title: Re: am i missing something? (performance question)
Post by Trippah on 07/02/10 at 17:39:26

Wouldn't a jet ski make more sense for Pburg? ;)

Title: Re: am i missing something? (performance question)
Post by BurnPgh on 07/02/10 at 21:10:26

Only if you're crazy enough to get in that nasty freaking water.

Title: Re: am i missing something? (performance question)
Post by groupus on 07/04/10 at 11:57:26

how big is your rear tire? I put a 150/90 on and it was big enough that it would expand at high speeds and rub on the swing arm brace thingy. did that at maybe 60-70 mph. ground down the swing arm and it still rubs but not as bad and upped the tops speed. i just have to behave til i get a new rear.