Compression testing on a trx90?

[platinum350]

Hello, I have been trying to fix this little trx90 for a while and I am not sure if it is getting compression. I have one of those compression testers that you hold up to the spark plug hole. I had a friend hold it up against the plug hole while I pulled it. There was no compression. Then I put it in gear and pushed the bike while someone was holding it in the spark plug hole, there was compression while doing this.
I know I have to replace the carb but before I do this I want to know whats going on w/ the bottom end. I wasn't sure if these bikes have some sort of compression thing so their easier to start for kids.
Anyway, anything on this would be very helpful.
Thanks!

[Pappy]

most of the compression testers i have seen and used screwed into the spark plug hole:confused:


and i do not believe they have any sort of compression release.

[wvspeedfreak]

Definately get a tester that screws into the hole.The type you are describing with the rubber cone tip are pretty much useless.Also give it 3-4 good hard pulls with the throttle wide open to get an accurate reading.

[platinum350]

OK, WILL TRY THAT! tHANKS FOR THE SUGGESTIONS.