250 2 stroker issue..

Mr Bean wrote:

Isolate the problem - does it rev up in neutral with the bike on a stand?

mb wrote:

Sounds like a fouled plug to me. Clean/replace. Make sure to gap it correctly. See what happens.

Mr Bean wrote:

Then my next step would be to put it on a stand, put it in gear and see if it will rev. Try revving in all...

Then my next step would be to put it on a stand, put it in gear and see if it will rev. Try revving in all gears and see what happens.

You asked if you messed up the tranny - well, does it shift properly through all the gears while on the stand?
Any funny noises or sensations when shifting?

This will help narrow down the conditions so you can answer your question about it being under a load or tranny issues.

The thought about a bad plug is that it doesn't make sense why it would act up in gear but not in neutral???

I don't believe there is any type of neutral position sensor on the engine so that would rule out an ignition issue being the reason why it revs properly in neutral but not in gear.

therealVB99 wrote:

Yes actually that's something I forgot to point out. I didn't have it on a stand , but I was sitting on it and that's the...

Yes actually that's something I forgot to point out. I didn't have it on a stand , but I was sitting on it and that's the only time it sounds Normal. In neutral.

Mr Bean wrote:

Then my next step would be to put it on a stand, put it in gear and see if it will rev. Try revving in all...

Then my next step would be to put it on a stand, put it in gear and see if it will rev. Try revving in all gears and see what happens.

You asked if you messed up the tranny - well, does it shift properly through all the gears while on the stand?
Any funny noises or sensations when shifting?

This will help narrow down the conditions so you can answer your question about it being under a load or tranny issues.

The thought about a bad plug is that it doesn't make sense why it would act up in gear but not in neutral???

I don't believe there is any type of neutral position sensor on the engine so that would rule out an ignition issue being the reason why it revs properly in neutral but not in gear.

Mr Bean wrote:

So, if I'm understanding you, it will rev up properly on the stand in gear (wheel in the air where it can spin freely) but if...

So, if I'm understanding you, it will rev up properly on the stand in gear (wheel in the air where it can spin freely) but if you try to rev it in gear while riding it, then it bogs?

Is that an accurate description?

Mr Bean wrote:

Well, it sounds load dependent which would lead me to think it was either a fuel supply or top end issue. If it were mine I'd...

Well, it sounds load dependent which would lead me to think it was either a fuel supply or top end issue.

If it were mine I'd check the following for starters:

Just for giggles do the real cheap (and free) and easy stuff first like put a new plug in it (it can be a regular B_ES to keep it cheap) and see what happens. Also, remove the air filter and see if anything changes when you do that.

If those don't reveal anything, I'd then clean the carb as you mentioned. Since the engine will want more fuel under a load it might have an obstruction that is leaning it out. If you need to clean it, I recommend disassembling it and soaking it. This dissolves build-up. If it were something like a piece of trash in a jet then compressed air can blow it out, but you'll probably be doing that anyway after it's been soaked and rinsed. While you've got the carb off, check the fuel line from the tank and make sure it's flowing properly and not starving the engine for fuel. Also check the tank vent hose to be sure it's clear and not causing any type of vacuum lock.

If that doesn't fix it then I'd check the condition of the top end. I've seen bikes that would run good on flat ground but fall on their face as soon as the slightest incline was attempted. The top end was worn out and didn't have enough compression to generate any torqure, so as soon as the load was applied they just bogged.

Let us know how you make out.

Mr Bean wrote:

Well, it sounds load dependent which would lead me to think it was either a fuel supply or top end issue. If it were mine I'd...

Well, it sounds load dependent which would lead me to think it was either a fuel supply or top end issue.

If it were mine I'd check the following for starters:

Just for giggles do the real cheap (and free) and easy stuff first like put a new plug in it (it can be a regular B_ES to keep it cheap) and see what happens. Also, remove the air filter and see if anything changes when you do that.

If those don't reveal anything, I'd then clean the carb as you mentioned. Since the engine will want more fuel under a load it might have an obstruction that is leaning it out. If you need to clean it, I recommend disassembling it and soaking it. This dissolves build-up. If it were something like a piece of trash in a jet then compressed air can blow it out, but you'll probably be doing that anyway after it's been soaked and rinsed. While you've got the carb off, check the fuel line from the tank and make sure it's flowing properly and not starving the engine for fuel. Also check the tank vent hose to be sure it's clear and not causing any type of vacuum lock.

If that doesn't fix it then I'd check the condition of the top end. I've seen bikes that would run good on flat ground but fall on their face as soon as the slightest incline was attempted. The top end was worn out and didn't have enough compression to generate any torqure, so as soon as the load was applied they just bogged.

Let us know how you make out.