2018 Colorado Rally, July 12-16

[JeffH]

$7.86 is a bit out of my price range.


On my way to the Colorado Rally in 2016
Was doing fine until the lid blew off, of course with the straw


That cup holder was on the Pacifico but I'd never used it. Did work ok but that large bicycle water bottle is good. Except with full face Shoei I still need a straw if I want to drink any water vs. just spray myself or wash my visor.

Jeff

[3Phase]

Looks good in the pic. 3Phase........just needs the rider to consume it.

Brant, is that a dare? Normally, me drinking water from a squeeze bottle at cruising speed out on the highway is one of the least like selfies to ever happen, much less get posted to the 'net.

[3Phase]

$7.86 is a bit out of my price range.

I'll find one for you.

On my way to the Colorado Rally in 2016
Was doing fine until the lid blew off, of course with the straw


That cup holder was on the Pacifico but I'd never used it. Did work ok but that large bicycle water bottle is good. Except with full face Shoei I still need a straw if I want to drink any water vs. just spray myself or wash my visor.

Jeff

I cheat. Modular. Helmet.

[motoman]

Brant, is that a dare? Normally, me drinking water from a squeeze bottle at cruising speed out on the highway is one of the least like selfies to ever happen, much less get posted to the 'net.

Actually no....not yet anyways. If your coming through here on way to Rally, dares may arise.

[Bonz]

Finally got a ride in, great weather here in the Front Range of the Rockies! Did just about 100 miles between two rides, what for? ...to break in the new pistons/rings in the ZRX1200. Put in a set of JE 12.5:1 stock bore (1164cc) pistons and the increased compression works very well with the other mods the engine has.

Looking forward to riding with you guys again this summer, it’ll be here quicker than we know!

[XJOK2PLAY]

Finally got a ride in, great weather here in the Front Range of the Rockies! Did just about 100 miles between two rides, what for? ...to break in the new pistons/rings in the ZRX1200. Put in a set of JE 12.5:1 stock bore (1164cc) pistons and the increased compression works very well with the other mods the engine has.

Looking forward to riding with you guys again this summer, it’ll be here quicker than we know!

Excellent Howard!
Glad to hear you got it back together!

[Bonz]

Yeah, nice to be riding it!

The engine now has a definite lean condition in cooler temps during last night's evening ride. Right off idle and at light cruise around 3000 rpm and below.

Question... If the carbs we're on the lean edge before adding compression in cooler temps, would adding a couple points of compression make it more sensitive to running lean, and be more noticeable?

My thought is yes, but wanted to ask you guys. I feel a 1/4-1/2 turn out on the fuel screws would do it.

[skids]

I would think that more displacement would require more air+fuel mixture. You did put in bigger pistons, right? Do bigger pistons actually increase compression or is there some other factor like different shaped piston crowns? I know that new rings have an effect. If the crowns are the same, I would think that the stroke is what determines compression. Or am I off base here?

[skids]

I would think that more displacement would require more air+fuel mixture. You did put in bigger pistons, right? Do bigger pistons actually increase compression or is there some other factor like different shaped piston crowns? I know that new rings have an effect. If the crowns are the same, I would think that the stroke is what determines compression. Or am I off base here?

Reference Boyle’s Law. P1V1=P2V2 for the first piston diameter. Note that Area is the same for V1 and V2 and then the stroke determines the change in pressure. Then take the second piston diameter. Again the change in pressure depends only on the stroke (change in volvume).

[Bonz]

The pistons are a stock 79mm bore. The ZRX 1200 uses nickel plated bores. Even after 50,000 miles, when you wipe the bore down with a red Scotch-Brite, it removes the surface “accumulation” in the bore, and the factory crosshatch is still there. Nickel is some hard and tough stuff. Piston rings don’t stand a chance against it and seal up extremely well.

I used a cylinder block from a ZZR1200 I found on eBay that had only 8000 miles on it. ZZR1200 and ZRX1200 are built on the same engine, many parts interchange.

Since my post and question Skids, I opened the fuel screws 1/4 to make it a bit richer down low. It made a positive reduction in the lean surge so I’m going to turn them out another 1/4 turn after work tomorrow and go for another ride. My experience says that will probably get me close or take care of the issue. Then I will sync the carbs.

I have seen both sides of the coin in researching the issue, where increasing compression requires richening up the mixture, and also some say requires going smaller on the main jet and in on the pilot screws.

In any case, I know what my bike is telling me (richen it up down low, may go up 1 size in mains as well, experiment) so it’s going to be fun getting it fine-tuned.

The ZZR1200 pistons were 11.0 to 1 compression ratio. I was running them at the rally last year. These 12.5 to 1 JE Pistons have added grunt and power everywhere.

For piston construction, the ZRX1200 stock piston (10.0:1) and ZZR1200 piston are identical other than the ZZR1200 has a slightly higher dome to gain a bit of compression. The JE pistons have fantastic valve cut outs, and sit further in the hole (below the block deck) than the ZRX/ZZR pistons by a nice amount (only talking hundredths/thousandths of an inch, but it’s a lot in motor terms). They have a wedge shaped dome that extends up further than ZRX/ZZR pistons. This gets compression up and allows for lots of leeway if a guy wanted to skim, mill or otherwise add even more compression. It’s a good safe build that really can’t be screwed up.

[skids]

Hey Bonz, were you riding on hwy24 through Divide today?

[Bonz]

It was not me.

I rode North on hwy 105 and took 67 up to Sprucewood then turned around and came back.

[Bonz]

Wow, just saw a news report that individuals will no longer be able to drive or ride their vehicles to the top of pikes Peak. Folks will park down below and they will have a shuttle service to the top.

Those rules will run through the summer into mid September.

Good thing we got a couple trips in for some of you guys!

[BA80]

I was talking to another rider on FB yesterday that said he was going to make the ride up but he was not allowed to, had to take a bus. The train was closed down too.

[Bonz]

My initial thought is this could cut down on their $$, I’ll never pay to park and take a shuttle to the top now. Then there will be those people who wouldn’t do it because it seemed perilous and they will be glad to take a shuttle.

Who knows, IMO one more chink in the armor of some great things no longer available.