Big bore kit review

[carver]

I brought a 3x jog with one of these in it

http://www.trademe.co.nz/Trade-Me-Mo...-248123997.htm

within 2000kms it was blowing 25psi on the comp tester, so i took it apart, and this is what i found

[The Everlasting]

Hmm don't think i will try that on mine.........

[tri boy]

Can't see the total piston, but there appears to be signs of early "cold seizure" scuff marks on the skirts. All down hill after that. Proper warm up and running in is good mkay.

[carver]

I have put in the '65 kit from scootling now, with the '70 head
should last well

[carver]

Can't see the total piston, but there appears to be signs of early "cold seizure" scuff marks on the skirts. All down hill after that. Proper warm up and running in is good mkay.

i did not run it in, but it did die when going 100kph a few times.
started straight away though

[tri boy]

i did not run it in,

Case closed Dr Watson.
Next time be more gentle, and take your time. it's not like sex with sidewinder.:-)

[AllanB]

I'd throw it off a bridge mate ...........

[carver]

Case closed Dr Watson.
Next time be more gentle, and take your time. it's not like sex with sidewinder.:-)

haha, its not mine any more!
no ramming it in dry eh?
i lubed the rings and bore with 2 stroke oil before i ran it.
it will be run in gently.

I'd throw it off a bridge mate ...........

haha, i might have done that by accident if i had more time a few months ago

[Spearfish]

At least bits for scoot are relatively cheap in comparison to bikes, should proly change the small end bearing every time you fit a new piston tho.

[Drew]

I have put in the '65 kit from scootling now, with the '70 head
should last well

The 70 head might drop the compression a wee bit, but nothing too substantial. Couple that by running it a bit rich, and it'll be torquey as hell.

[carver]

At least bits for scoot are relatively cheap in comparison to bikes, should proly change the small end bearing every time you fit a new piston tho.

done sir....

I always do that

The 70 head might drop the compression a wee bit, but nothing too substantial. Couple that by running it a bit rich, and it'll be torquey as hell.

yeah, i wonder why it ate the first one?

[Drew]

yeah, i wonder why it ate the first one?

First thing that occurred to me when I read the Trademe ad, was that running a standard carb would make it lean. If it shit itself a couple times I think it was seizing, which has done all the damage to the piston. A small two stroke will often fire back up pretty quickly after a seizure, and often be a mongrel to start next time from cold when the piston and ring shirink down and harden.

[carver]

First thing that occurred to me when I read the Trademe ad, was that running a standard carb would make it lean. If it shit itself a couple times I think it was seizing, which has done all the damage to the piston. A small two stroke will often fire back up pretty quickly after a seizure, and often be a mongrel to start next time from cold when the piston and ring shirink down and harden.

Oh yeah?
When i had it die on me, i expected it was from fuel starvation, It has been re jetted to suit.
I fired straight back up after it died, when it died, it died when it was going flat out, and the photos are the result.

[Spearfish]

The head could be the original, some of the 70 kits use the standard head.
Has anyone seen this method of running in an engine? It seems harsh and against he standard rules but make some good points.

http://www.mototuneusa.com/break_in_secrets.htm

Or is it just another pile of Gob Shyt.

[Drew]

The head could be the original, some of the 70 kits use the standard head.
Has anyone seen this method of running in an engine? It seems harsh and against he standard rules but make some good points.

http://www.mototuneusa.com/break_in_secrets.htm

Or is it just another pile of Gob Shyt.

Yep, I've heard of that. Makes perfect sense to me and is how I would run a motor in.

A bike mechanic I know, reckons that the easy run in manufacturers suggest is mostly to ensure the bike is correctly assembled. To minimise damage if something comes undone.