90 VTR250 Trackbike or bust

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Re: 90 VTR250 Trackbike or bust

Postby Spoot5 » Wed May 30, 2018 7:27 pm

Bellypan is here. started to do the boxed-out mod, but will now fill that in and just cut the back\lower off and lower the whole thing an inch, like Spot suggested.
Sounds like my Penske shock is ready for pickup.
Missed the last race weekend....and my pencilled in trackday. uhg.

Painted the plastics & tank. Sides got crinkled because I used the wrong clearcoat. uhg. Tank looks pretty good, could have done more prep to make it look nicer?
Front number plate is mounted.
'90 VTR250 Interceptor / '98 VF750F Magna / '98 VTR1000F / '08 Ridgeline / Honda Racing Bicycle
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Re: 90 VTR250 Trackbike or bust

Postby spotthedogg » Wed May 30, 2018 7:30 pm

Paint is all about prep and good quality materials, watch out for contamination too.
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Re: 90 VTR250 Trackbike or bust

Postby Spoot5 » Mon Jun 04, 2018 5:52 pm

I have been using the Spray Max Glamorous High Gloss.
My last can I used on the tank, then I went to a new place and bought a few new cans...but I didn't realize, the new cans were called "Rapid".
So, what I believe happened was that the Rapid dried too fast on top of wet paint (like I normally do) and it crinkled.

After I boogered it up, the can of Rapid says it drys in a couple minutes. The Glamorous dries in an hour and cures in 24hr (something like that)
'90 VTR250 Interceptor / '98 VF750F Magna / '98 VTR1000F / '08 Ridgeline / Honda Racing Bicycle
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Re: 90 VTR250 Trackbike or bust

Postby Spoot5 » Thu Jun 28, 2018 6:49 am

I had my first trackday. Little thing didn't blow up!!

I did find some stuff I have to address....So, last night I started in on my list.

1. Caliper was dragging bad. Cooked the dust seals.
- Found that the tabs on the pad were bent(?) and prob kept pads from moving. Rebuild with new seals. New EBC HH pads. Bleed brakes again.
- FYI, I also swapped out the R3 master cylinder (which was 11mm) for my Honda Superhawk master (14mm). MUCH better lever force!

2. Belly pan dragging on right, at the bump-out for the pipe AND the underside.
** With my knee on the ground, I was still dragging pan in T6. So bad in fact, it actually off-weighted the rear tire and started to slide. :shock:
- Raised shock ride height by 6mm and removed the little clip on the forks above the handlebars so I could raise the front end by 3mm.
- The Penske shock added 4.5mm in ride height to begin with, so in theory, I should be 10.5mm higher than stock (rear) and now 3mm more in front.

3. Left shift lever was still rubbing on belly pan, but functional. It was already bent out before assembly.
- Will bend shift lever even more to make room for belly pan. I have a donor now in case it doesn't bend enough.

4. Another oil change.
- Looks like it used some up, but this is the first time in a decade that this engine has been run and distance\time...and it was run hard.

5. Was running 26R\31F hot tire pressure (Pirelli SC1 v2 front \ SC2 v1 rear).
- Had debris on leading edges in front & rear.
- Decreased rebound on rear 2 clicks.
- I will have to talk to my suspension peeps...front rebound is controlled by the oil weight? I'm running 15wt...so, maybe a slight blend with some 10wt??
- Also had a little hot tear on the front, so I will come up 1lb psi on the front. This weekend is supposed to be a bit warmer than my last outing.

6. I had a notable stutter\glitch on the throttle at 11k-13k rpm. 
 - CapitalView thought this sounded identical to the issue he had on his carb'd SV. He put in bigger jets and cured the problem.
 - We pulled the spark plugs out - they were very white and only a slight tad of tan color, but more-so white. That means lean.
 - Decided to put in bigger jets. Went to 122 mains. Had 120's in it. Reassemble carbs & installed. Still starts and revs ok. Almost felt beefier than before.
 - Verified that the slides were moving properly before putting tank and airbox back on.
'90 VTR250 Interceptor / '98 VF750F Magna / '98 VTR1000F / '08 Ridgeline / Honda Racing Bicycle
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Re: 90 VTR250 Trackbike or bust

Postby spotthedogg » Fri Jul 13, 2018 7:38 am

Sounds like you had fun!
If you are dragging your belly pan you need to hang off more and carry less lean angle. My bike is raised 1" in the rear and lowered 5mm in front.

Image

I am still using 112 main jets, surprised at your 122's.

Are you running the 110/140 Pirelli on the stock rims? I find the SuperCorsa very easy to carry a lot of lean angle but there is no edge feel, as in they just keep going down. With them pinched on the narrow stock rims this would be even worse.

You should have some rubber accumulation on the edge of the tire, a 1/8"-3/16" ball every 3" along the edge means good temperature. If the balls are linking up into larger balls add 1PSI, if it is a consistent smear (molten rubber) add 2PSI.
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Re: 90 VTR250 Trackbike or bust

Postby Spoot5 » Thu Sep 13, 2018 7:51 pm

I'm running 110/70 front and 120/70 rear. So, each tire is shorter than a stock tire.
The rubber\debris on the tire is on the leading edge of the sipes, not on the sides. iirc, that means the rebound is too fast and needs to be slowed down.
I have the usual marbles collected on the rear, not as many on the front.
Therear tire has been about 125-130F by the time I get to the pits. The front is about 100F. I came down .5psi and then the front was 110F.

I am at +11mm on the Penske ride height. The Penske was 3mm longer than stock shock.
Front (stock) handlebar mount is even with the top of the fork tube, so front is raised about 3-4mm?

I haven't been rubbing much after the last adjustments, but in my last race, I passed a N300 deep into braking for T6 (my usually rub place) and I rubbed a bit again. The rest of the race I didn't rub.
I had a great battle with that N300. I passed him twice in T6, but he kept blasting me on the front straight. Then I saw him go wide into T3 (right handed carousel) and I came up the inside again and held him off through T7 and when we hit the front (last lap) I held him off a tad longer with a good drive out of T7....but, he still motored me and beat me easily to the finish.
ARGH!

I am currently in 4th in CCS MidWest for 300Supersport. I have a couple 3rd places and a couple top amateur plaques.
I still have some corner speed to pick up.

Sept 22 will be my last race for the season. <fingers crossed>
'90 VTR250 Interceptor / '98 VF750F Magna / '98 VTR1000F / '08 Ridgeline / Honda Racing Bicycle
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Re: 90 VTR250 Trackbike or bust

Postby Spoot5 » Thu Sep 13, 2018 8:30 pm

we don't have many good photographers at the races, but here are a couple pics.
I hang off more on right-handers, but T6 is slightly banked and I usually only rub there. But I have rubbed on the left (T4) as well.

The last race, I noticed that I've been rubbing my right toe on the ground, too. I have the balls of my feet on pegs.

Image

Image
'90 VTR250 Interceptor / '98 VF750F Magna / '98 VTR1000F / '08 Ridgeline / Honda Racing Bicycle
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Re: 90 VTR250 Trackbike or bust

Postby rashmaster13 » Sun Sep 16, 2018 9:35 pm

I ride on my toes when cornering, boots are expensive. Charlie might have a set or 2 left of the rearsets he machined, if he can find them.
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Re: 90 VTR250 Trackbike or bust

Postby Spoot5 » Mon Sep 17, 2018 6:02 pm

rashmaster13 wrote:I ride on my toes when cornering, boots are expensive. Charlie might have a set or 2 left of the rearsets he machined, if he can find them.

I've got pretty long legs, so "rearsets" might be tough for me. I already have aluminum pegs that are for passengers.
If I could get 1/2" higher, that might do it.

But, I should also try to hang off more.
'90 VTR250 Interceptor / '98 VF750F Magna / '98 VTR1000F / '08 Ridgeline / Honda Racing Bicycle
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Re: 90 VTR250 Trackbike or bust

Postby rashmaster13 » Sun Sep 23, 2018 12:46 pm

The lowest position is stock, but they are way narrower, plus they act as sliders in a crash. They also crash well, unlike the stock stuff which seems to made of peanut butter, and some aluminum colored metal.
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