Bashan Blaze cant get past 7000 rpm?

[Merlin]

For the first time I took my Blaze onto the main hi way. I opened it up to WOT for a few seconds and I could not get it past 7000 rpm or 55 mph? (gps) At close to 7000 rpm or WOT the engine would start to sputter. If I let off WOT a very small amount it would smooth out. I have 350 miles on the bike. Iam at over 8500 feet and the bike runs fine at all other rpm's. This carb has no air gas mixture screw. Should I adjust the clip on the needle? Iam thinking of getting a new carb with a air gas screw and a new muffler?
For me other then riding the bike this is the fun part.

[JerryHawk250]

If its like the Hawk you will need to change the main jet out to a larger jet. It's running to lean. My hawk was the same way. It had a 98 and I put a 110 jet. Made a huge difference in top end.

[Weldangrind]

I suspect you'll find a pilot mixture screw on the underside of the carb, right where it meets the intake tube. If you feel the bowl, you'll note that there is a relief that accommodates the screw. It is a bear to get at.


That said, it isn't likely to resolve your issue. As Jerry pointed out, you need a bigger main jet. When it comes to swapping jets, I prefer to also swap to a Mikuni, since finding jets is much easier and cheaper. A new Mikuni can be had for less than $40 shipped.


To respond to your other question, moving the clip will affect mid-range, not WOT.

[JerryHawk250]

The Mikuni jets will fit the stock Hawk carburetor. I got them from Amazon. https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

[Merlin]

Originally Posted by JerryHawk250

The Mikuni jets will fit the stock Hawk carburetor. I got them from Amazon. https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

I wonder if it will fit my carb? Do you know what carb the Hawk has?

[JerryHawk250]

Originally Posted by Merlin

I wonder if it will fit my carb? Do you know what carb the Hawk has?

[Merlin]

Originally Posted by JerryHawk250

Thanks Ill check my carb.

[Ariel Red Hunter]

Originally Posted by Merlin

I wonder if it will fit my carb? Do you know what carb the Hawk has?

Keihan

[humanbeing]

Originally Posted by JerryHawk250

The Mikuni jets will fit the stock Hawk carburetor...

[Main jet]
# system is different http://www.jetsrus.com/FAQs/FAQ_miku...ihin_sizes.htm
Different thread pitch: Keihin .8mm vs Mikuni .75mm
NEVER try fit any Keihin jet on Mikuni. The carb will destroyed in no time.

[Merlin]

Originally Posted by humanbeing

[Main jet]
# system is different http://www.jetsrus.com/FAQs/FAQ_miku...ihin_sizes.htm
Different thread pitch: Keihin .8mm vs Mikuni .75mm
NEVER try fit any Keihin jet on Mikuni. The carb will destroyed in no time.

Thanks for this very helpful info.

[JerryHawk250]

Originally Posted by humanbeing

[Main jet]
# system is different http://www.jetsrus.com/FAQs/FAQ_miku...ihin_sizes.htm
Different thread pitch: Keihin .8mm vs Mikuni .75mm
NEVER try fit any Keihin jet on Mikuni. The carb will destroyed in no time.

Just to clears things up These are the Jets I bought for the stock Hawk carburetor. https://www.amazon.com/gp/product/B0...-20&pldnSite=1

[Merlin]

Originally Posted by Weldangrind

I suspect you'll find a pilot mixture screw on the underside of the carb, right where it meets the intake tube. If you feel the bowl, you'll note that there is a relief that accommodates the screw. It is a bear to get at.


That said, it isn't likely to resolve your issue. As Jerry pointed out, you need a bigger main jet. When it comes to swapping jets, I prefer to also swap to a Mikuni, since finding jets is much easier and cheaper. A new Mikuni can be had for less than $40 shipped.


To respond to your other question, moving the clip will affect mid-range, not WOT.

Thanks for the advice. Its time to buy a new carb. I will wait to re jet it until I get my new muffler.

[Ariel Red Hunter]

Originally Posted by Merlin

Thanks for the advice. Its time to buy a new carb. I will wait to re jet it until I get my new muffler.

Even the stock Mikuni main jet is richer than what came on the bike. I think you will notice an improvement right away.

[Weldangrind]

Originally Posted by Merlin

Thanks for the advice. Its time to buy a new carb. I will wait to re jet it until I get my new muffler.

You're welcome. I've probably installed a dozen 30mm Mikuni carbs, and the results have always been excellent after proper jetting.

[Ariel Red Hunter]

Originally Posted by Merlin

For the first time I took my Blaze onto the main hi way. I opened it up to WOT for a few seconds and I could not get it past 7000 rpm or 55 mph? (gps) At close to 7000 rpm or WOT the engine would start to sputter. If I let off WOT a very small amount it would smooth out. I have 350 miles on the bike. Iam at over 8500 feet and the bike runs fine at all other rpm's. This carb has no air gas mixture screw. Should I adjust the clip on the needle? Iam thinking of getting a new carb with a air gas screw and a new muffler?
For me other then riding the bike this is the fun part.

I'm not sure which engine is in the Blaze. If it is the push rod one, it is like the Hawk. What you describe sounds like the main jet is too lean. By the way, congrats on fixing all the problems you had with your bike.