ESE's works engine tuner

[TZ350]

What size is that chain going to be

The team had settled on 428 and have a large selection of sprockets, but I favour 415 for this project and could trim some wider 428 sprockets to suit.

[diesel pig]

The team had settled on 428 and have a large selection of sprockets, but I favour 415 for this project and could trim some wider 428 sprockets to suit.

It may have the same pitch as 415 but 428 has bigger dia rollers so it will not fit I am afraid.

[TZ350]

It may have the same pitch as 415 but 428 has bigger dia rollers so it will not fit I am afraid.

Thanks for the heads up ...

[lodgernz]

Wobbly suggested I use Devcon to contour the roofs of transfer ports.
I see there are several Devcon "plastic steel" epoxies. I'd appreciate it if someone would point me at the best product for this application.

[Yow Ling]

Wobbly suggested I use Devcon to contour the roofs of transfer ports.
I see there are several Devcon "plastic steel" epoxies. I'd appreciate it if someone would point me at the best product for this application.

this stuff is good and easy to work with http://www.no8online.co.nz/mainmenu1...set+Epoxy.html

[F5 Dave]

420 can be taken down to 4.3mm from memory to use 415. 428 cannot. Don't forget to bevel the edges of the sprocket and fronts can be souper hard. Just skim the outer area and watch offset to stay consistent.

[peewee]

he might of been suggesting this devcon http://www.devcon.com/products/produ...utty%20%28F%29

this stuff works pretty good also http://www.polymericsystems.com/epox...lue-yellow.htm

if you plan to use any of it with methanol , do a test before applying it to the engine because some epoxies wont stand up to methanol but i think most will do fine with gasoline. might not be a bad idea to test it against the particular gas you plan to use just in case theres a problem with the compatability

[seattle smitty]

You're right; that won't burn. It was a typo; it should read CH3NO2, not CH3OH2. Maybe this will help

New member here, old Yank outboard racer, mostly 250cc Hydroplane, 45 years ago (and maybe again soon):

Mr. Overmars (and any and all other real dedicated 2-stroke gear-heads), in my entry in the New Member section, I've laid out a welcome mat for those of you who got legislated out of GP bike racing, and who might be open to a form of racing that rewards pure 2-stroke horsepower. We outboarders commonly burn methanol, and we are free to try nitro and such other exotic (liquid only) fuels as we think our engines can be made to survive. (If anybody cares to hear a little more about it, go to the New Member section).

I expect to just be a lurker here for a while (with a thousand pages to catch up on!!!), but hope to start occasionally adding my 2 cents worth at some point. But seeing the reference to nitro, I had to make my little sales-pitch . . . .

[Grumph]

this stuff is good and easy to work with http://www.no8online.co.nz/mainmenu1...set+Epoxy.html

That's a bit low temp for safety, Mike. Devcon seems to be safe to around 100C and there's a Loctite filler which is safe to about 120C - and cheaper than Devcon too.

[Yow Ling]

That's a bit low temp for safety, Mike. Devcon seems to be safe to around 100C and there's a Loctite filler which is safe to about 120C - and cheaper than Devcon too.

Good point I was thinking watercooled motor

[FastFred]

We outboarders commonly burn methanol, and we are free to try nitro and such other exotic (liquid only) fuels as we think our engines can be made to survive.

TeeZee would absolutely love to be able to use exotic fuels ...

[FastFred]

New member here, old Yank outboard racer, mostly 250cc Hydroplane, 45 years ago (and maybe again soon): I've laid out a welcome mat for those of you who got legislated out of GP bike racing, and who might be open to a form of racing that rewards pure 2-stroke horsepower. We outboarders commonly burn methanol, and we are free to try nitro and such other exotic (liquid only) fuels as we think our engines can be made to survive. (If anybody cares to hear a little more about it, go to the New Member section).

Below is a the link to the start of Smittys new member posts, they are well worth a look:-

Raced 250cc alky-burning Konigs and other oddities (Quincy, Anzani, Yamato) on hydroplanes and racing runabouts in the mid-60's thru mid-'70s. Still have some old gear, hope to get back on a racecourse and impede everyone else's progress sometime before I croak. My interest here is in 2-stroke engine tech.

[wobbly]

I searched all over the world for a good priced " real " Devcon,and was amazed that RS product 691-195 was as good a price as I could get.
RS is always silly prices but they have the stock usually,I ordered a couple of tubs and it took a few days to come from usa.
The putty doesnt slump much and can be smoothed over with a wet finger to look real nice without much grinding when set.
If you want to do port roof angles I sit the cylinder on a jig of some sort with the angle you want,warm the cylinder up, fill with Devcon and the temp makes
it slump slowly level at the correct angle.
Put a bit of tape over the bore so you can over fill slightly and then grind the roof angle and corner radius when its gone off.
At 80*C it goes hard in about 1/2 an hour.

[lodgernz]

Thanks for all your helpful replies re Devcon for transfer ports.
I'm sorry that I forgot to mention the the motor is water-cooled and the cylinders I am modifying are cast iron.
Does that make a difference to the choice of compound?

[husaberg]

Wobbly suggested I use Devcon to contour the roofs of transfer ports.
I see there are several Devcon "plastic steel" epoxies. I'd appreciate it if someone would point me at the best product for this application.

This is what I understand they used at Aprilia
http://www.sylmasta.com/acatalog/Cre...e_Putties.html

There is also references from other contributors to what they use.

Reference to "Stucco Verde"
on Page 16, 28, and 30 of part 2 of the thread Interview with Mr Thiel and Overmars