Homeade PV cover mod?

[jgas]

I have not seen the inside of a GG powervalve, so please forgive my ignorance if this is a stupid question. My question is regarding a larger PV cover for more bottom end. Why not simply buy several gaskets and space it out to increase volumn? Or make a homeade spacer using the gasket as a pattern? How much larger are the aftermarket covers?

Thanks.

 

[Elvis74]

take this one
http://www.gasgasrider.org/forum/showpost.php?p=93387&postcount=35

 

[Jakobi]

 

[HenrikSchmidt]

I've made many tests on different volumes, and about and inch seems to be the space needed to boost the bottom end the most.
I have made a few of theese and I also have made a adjustable one, and they work great.
Here is the first of the non adjustable..(I know the bike is dirty, the picture is taken after testing the cover)

just, PM me if you are interrested in one or the other..
I could also make a spacer for the original cover, but this one look's more bling

 

[bonkeye]

what is the thickness of the spacer? whay about the bolt in the center wouldnt that need spacing out aswel ?

 

[swazi_matt]

I've made many tests on different volumes, and about and inch seems to be the space needed to boost the bottom end the most.
I have made a few of theese and I also have made a adjustable one, and they work great.
Here is the first of the non adjustable..(I know the bike is dirty, the picture is taken after testing the cover)

just, PM me if you are interrested in one or the other..
I could also make a spacer for the original cover, but this one look's more bling

An inch? I have a 15mm spacer and the bottom was nnoticeably improved, may have to get an additional 10mm so I can throw away the clutch lever!

 

[HenrikSchmidt]

Yes, indeed an inch, or almost.. I ended up at 24mm, so if you have a 15mm spacer + the original cover are already spaced 6mm youre ending up at 21mm, throw in a couple of gaskets and you're there

 

[Jakobi]

what is the thickness of the spacer? whay about the bolt in the center wouldnt that need spacing out aswel ?

I had them machined at 8mm each so I could run any combination to do some testing. I however have been super lazy and just run on the 1. The center bolt hole can either be sealed up with a nut and bolt, or I simple used a bolt still and just snugged it up. You don't want to over torque it with nothing behind it. Thats for sure!

 

[bonkeye]

I had them machined at 8mm each so I could run any combination to do some testing. I however have been super lazy and just run on the 1. The center bolt hole can either be sealed up with a nut and bolt, or I simple used a bolt still and just snugged it up. You don't want to over torque it with nothing behind it. Thats for sure!

how was the diffrence to the bike with the 8mm spacer? HenrikSchmidt mentioned a 15mm spacer would that give better bottom end tourque than the 8mm spacer?

 

[Jakobi]

No idea,

I fitted it at the same time I went from a 300 to a 250 top end. It wouldn't be fair to compare them. In saying that it still lugs very well. I can always drop a second spacer in to get 16mm+ the original cover as a comparison. I just havent felt the need.

 

[hannesd]

how would a spacer react on my 200?
would it help with more torque,or less difference then on a 300?

 

[HenrikSchmidt]

Witout knowing for sure, I would think it woud be much more noticable than on a 300, it's gives more on a 250 than on the 300, so maybe even more on the 200

 

[jgas]

I'm glad to know that my idea would work, but a regular poster on this site, Lawman, just offered to give me an old one he isn't using! Who gives free stuff away? GG Riders Club members, thats who!

Lawman, thanks. I owe you a steak and a beer, and a guided tour of Brock Creek. Or I'll spitshine your riding boots. I sure hope you opt for the steak and a BC ride, polishing riding boots would be tough, and not nearly as much fun.

Jeff.

 

[LAWMAN]

I'm glad to know that my idea would work, but a regular poster on this site, Lawman, just offered to give me an old one he isn't using! Who gives free stuff away? GG Riders Club members, thats who!

Lawman, thanks. I owe you a steak and a beer, and a guided tour of Brock Creek. Or I'll spitshine your riding boots. I sure hope you opt for the steak and a BC ride, polishing riding boots would be tough, and not nearly as much fun.

Jeff.

No need to polish the boots, I'd rather have the steak & the ride!

 

[jgas]

Well, since you tell me you don't want spit shined boots, I'll be honest. I was gonna polish your boots, then piss on em'. Depending on how the PV cover worked, I might have even pissed in em'.

 

[jgas]

Fred Overstreet of FM Powersports built me a 275 motor, ported for torque. The motor is exactly what he said it would be, and he did the work within his quote and did it well.

Lawman hooked me up with a larger PV cover for even more torque. I'm an old slow guy but I ride some very technical terrain, some is almost Trials type stuff, so I need controllable power more than raw power. I got just what I wanted with Fred's motor mods and Lawmans PV cover.

Here's the but: The jetting is rich on bottom, from idle to about 1/3 throttle, then it cleans out. Most of the time it doesn't load up unless I am idling around for a long time, or never getting on the pipe, but I have fouled a couple of plugs, and need to rejet. Again, where I ride and at my skill level I spend quite a bit of time at low rpms. I can clutch and rev to keep it cleaned out but I'd rather get it jetted so I can just ride it any way I want without having to think. I should also say that I'm a "gear high" rider, trying to be smooth not revving much.

I haven't looked at the jets yet to see what they are, but am pretty sure they will be stock for an 01 XC. Anyway, I am sure I need to go leaner on the pilot, but how many sizes? What is a good guess, how many sizes leaner? Do I need to change the needle, reset the float, or change the clip position?

I know it's hard to guess based on what I have said here, but is there a general rule of thumb on how many sizes to go leaner on the pilot to prevent plug fouling and clean up the bottom end response? How big of a jump down in pilot size would likely be too lean? How many sizes down will make a noticeable difference?

If it matters, I am using Kawasaki brand 2 cycle oil, (which I get cheap from a dealer who just starting selling GasGas by the way, shameless plug for Kawasaki/KTM/GasGas Center in Little Rock Ar), at 50:1 with 92 octane pump gas.

 

[Fred1956]

Find out what you have first Jeff,then go from there.....The jetting thread has a ton of info and Jakobi is the needle wizard but you'll need to know where you're at to start

 

[Jakobi]

I think jgas already started a thread regarding this saying it was a eg kit? In saying that I can offer heaps of suggestions but you need to provide as much detail as you can about where (throttle position) and how (burbly/doughy/flat) the bike is acting, along with the current configuration. It also helps if you can specify what the bike is doing well. Carb model. etc etc. The more info you can provide the more specific the answers will be. This is a must as you really are dealing with a one off build.

 

[Fred1956]

Same bike Jakobi, it is an E Gorr modded cylinder. Squish measured 1.35mm, I know carb is a AS1 38mm but I didn't look at jetting when I had it. Jetting is personal.....

 

[jgas]

Dang right it's personal. I take it personal when it fouls a plug! I was planning to buy a few jets, take the bike to where I ride most of the time, and carry the tools, carb cleaner, rags, etc. to do it on the trail. My plan was to pick a short loop that had a little of everything that I do and keep jetting until I was happy. But I didn't know where to start. I guess I am being lazy and not wanting to pull the carb, find what is in it, put it back together, then do it all over again on the trail. If I had a rough starting point I could buy a few jets to begin. A local dealer sells me stuff like that cheap so he won't have to put one of his guys on my job. Eventually I will probably send the carb to, what is it, RD Designs? For now I just want to ride it. Even like it is I am really liking it. It's like a 4 stroke on steroids. Like riding a quick 400 4 stroke but with the lightweight of a 2 stroke, and the revvy nature which is more fun to ride I think. The nice thing is it will crawl slow from idle or haul heiney.